A reinforcement method based on internal force redistribution in indoor structure

Abstract

The application belongs to the technical field of building structure, and provides a reinforcing method based on indoor structure internal force redistribution, which accurately defines the construction feasible domain by identifying the space constraint boundary formed by the external obstacles, greatly improving the site adaptability and landing feasibility of the reinforcing scheme; the target internal force distribution is taken as the constraint, the force transmission path set is generated through topological optimization, and the target path is selected, so that the disturbance of the reinforcing process to the original structure is minimized while the force transmission efficiency is ensured, realizing the unity of force transmission rationality and construction feasibility; based on the spatial accessibility of different nodes on the target path, the target internal force distribution is decomposed into stage internal force distribution, and the layout scheme and timing of the corresponding internal force regulating device are matched, realizing staged and orderly driving and accurate internal force regulation; by continuously tracking the structure internal force distribution, the deviation is corrected in time, so that the internal force distribution always maintains within the allowable deviation range, greatly improving the long-term bearing safety of the structure.

Description

Technical Field

[0001] This application relates to the field of building structure technology, and in particular to a reinforcement method based on the redistribution of internal forces in indoor structures. Background Technology

[0002] Structural reinforcement is an engineering aspect of building renovation and performance enhancement, while internal force redistribution is a technical approach to improve the structural stress balance and enhance overall load-bearing safety. Existing indoor structural reinforcement technologies have undergone long-term development and have formed a technical system primarily based on passive reinforcement. Conventional methods include bonding carbon fiber composite materials, bonding steel plates, external steel cladding, increasing cross-sections, and localized reinforcement. These technologies improve the structural load-bearing capacity by physically reinforcing weak structural members, but they are unlikely to alter the redistribution of internal forces within the structural system.

[0003] With the increasing demand for refined structural reinforcement, some technologies are combined with construction monitoring to achieve dynamic observation of the reinforcement process, in order to adapt to the complex indoor construction environment. The above technologies have been applied to some extent in conventional indoor structural reinforcement scenarios, promoting the initial development of structural reinforcement from passive reinforcement to controllable adjustment and active reinforcement.

[0004] Existing methods for reinforcing indoor structures are insufficient to meet the requirements of high precision, high adaptability, and long-term stability. They fail to incorporate the spatial constraints formed by obstacles such as exterior curtain walls and enclosure components into the reinforcement design system, which can easily lead to problems such as interference between reinforcement construction and obstacles, and insufficient construction space. This restricts the implementation of reinforcement projects, fails to improve the structural load-bearing capacity, and results in a disconnect between the theoretical rationality of the scheme and its practical applicability on site.

[0005] Passive reinforcement mainly focuses on strengthening, without changing the force system, without unloading, and with stress hysteresis. Although mature and reliable, it has inherent shortcomings in changing the force system, controlling deformation, reducing the burden on the original structure, seismic ductility, durability, and long-term safety reserves. It has obvious technical limitations for structures with heavy loads, large deformations, high-intensity seismic resistance, and high durability requirements.

[0006] To address the shortcomings of the existing technologies, this application aims to solve the technical problem of how to achieve precise reinforcement and long-term stability of indoor structures based on internal force redistribution in complex construction environments. Summary of the Invention

[0007] The purpose of this application is to overcome the shortcomings of the prior art and provide a reinforcement method based on the redistribution of internal forces in an indoor structure. The method includes: detecting the indoor structure to identify the spatial constraint boundary formed by external obstacles, taking the area within the spatial constraint boundary as the feasible region, and determining the target internal force distribution of the indoor structure according to the structural bearing capacity requirements. With the target internal force distribution as a constraint, a set of force transmission paths is generated in the feasible region through topology optimization. Based on the structural perturbation degree, control feasibility and spatial accessibility of nodes, the target path is selected from the set of force transmission paths. Based on the spatial accessibility of different nodes on the target path, the target internal force distribution is decomposed into the stage internal force distribution of different construction stages. Based on the stage internal force distribution and the target path, the layout scheme and timing of the internal force control device are determined within the feasible domain. The internal force control device is deployed and driven in stages according to the time sequence to monitor the internal force response parameters of the indoor structure, compare the internal force response parameters with the parameters of the current stage of internal force distribution, and adjust the operating parameters of the internal force control device. The internal force distribution of the indoor structure is continuously monitored. When the internal force distribution is found to deviate continuously from the allowable deviation range of the target internal force distribution, the operating parameters of the internal force control device are adjusted to correct it.

[0008] Optionally, identifying the spatial constraint boundary includes: The system detects the spatial coordinates and component location distribution of the interior structure, and detects external obstacles within the pre-defined construction influence range at the edge of the interior structure, identifying the outline, spatial distribution, and fixation properties of the external obstacles. Based on the component location distribution of the indoor structure and the fixed properties of the external obstacles, the constraint levels of the external obstacles are classified, and rigid obstacles with high constraint levels are screened out. Based on the spatial coordinates of the interior structure, and combined with the outline and spatial distribution of rigid obstacles, the spatial constraint boundary formed by the rigid obstacles is delineated.

[0009] Optionally, determining the target internal force distribution of the indoor structure includes: The feasible region is defined as the area within the spatial constraint boundary. The actual load-bearing state of the indoor structure is detected based on the spatial range of the feasible region, and the load-bearing internal force threshold of different components is determined according to the requirements of structural load-bearing performance. Based on the spatial distribution of rigid obstacles, the bearing internal force thresholds of different components within the feasible domain are adjusted according to the correlation between component internal forces and deformation, thus forming the initial internal force distribution of the indoor structure within the feasible domain; Verify the spatial adaptability of the theoretical deformation of different components of the indoor structure to the feasible region under the initial internal force distribution. After calibrating the allowable deviation range of the target internal force distribution, determine the target internal force distribution of the indoor structure.

[0010] Optionally, the generation of the force transmission path set includes: Using the feasible region as a spatial constraint and the target internal force distribution as a mechanical constraint, the area where rigid obstacles are located within the feasible region is set as a path prohibition zone, and the internal force values ​​corresponding to the target internal force distribution are extracted to determine the error limit of internal force transmission. The feasible region is divided into multiple structural units, with the optimization objective being to satisfy the error limits of spatial constraints and internal force transmission, and to avoid entering the path prohibition zone. Based on the optimization objective, the force transmission contribution of different structural units is calculated using a topology optimization algorithm, and internal force transmission paths with a force transmission contribution greater than a preset contribution threshold are retained. The force transmission path set is then generated iteratively.

[0011] Optionally, the selected target path includes: The disturbance amplitude of the indoor structure caused by each internal force transmission path in the detection force transmission path set is determined by combining the allowable deviation range of the target internal force distribution. The node layout space and the matching dimensions of the internal force control device for each internal force transmission path are detected to determine the feasibility of control. The minimum distance between different nodes and rigid obstacles on each internal force transmission path is also detected to determine the spatial accessibility of the nodes. The system assesses the suitability of structural disturbance degree, control feasibility, and spatial accessibility of nodes. If all conditions are met, the corresponding internal force transmission path is selected as a candidate path, with priority given to candidate paths whose structural disturbance degree is less than a preset amplitude threshold as the target path.

[0012] Optionally, decomposing the internal force distribution of the stage includes: Based on the spatial accessibility of nodes on the target path and the fixed properties of rigid obstacles, the accessibility level of nodes is divided, and the relationship between accessibility level and internal force transmission is established by combining the force transmission contribution and the internal force value gradient of the target internal force distribution. Based on the correlation, the construction stages are divided according to the accessibility level, and the internal force values ​​of the target internal force distribution are broken down according to the internal force transmission requirements of different construction stages to obtain the initial stage internal force distribution. Verify the matching between the initial stage internal force distribution and the spatial accessibility of nodes in the corresponding construction stage, and determine the stage internal force distribution for different construction stages after correcting the matching deviation.

[0013] Optionally, determining the layout scheme and timing of the internal force control device within the feasible region includes: The safety distance is determined based on the measured distance between the spatial coordinates of the rigid obstacle and the path unit corresponding to the target path, and the constraint parameters of the internal force control device are determined based on the gradient ratio of the internal force distribution in each stage. Based on constraint parameters, force transmission sections with a force contribution greater than the preset contribution threshold and a measured distance not less than the safety distance are marked on the target path. The corresponding construction stage is matched according to the accessibility level of the nodes, and the number of nodes is determined according to the number of nodes in the force transmission section to form a layout scheme for the internal force control device. Based on the deployment scheme of the internal force control device, the activation priority of the internal force control device is set according to the accessibility level of the node, and the timing sequence of the internal force control device is determined by taking into account the time required for the connection of the stage internal force distribution.

[0014] Optionally, the operating parameters of the internal force regulating device include: The internal force control devices are deployed in stages according to the deployment plan and time sequence, and the internal force control devices corresponding to different construction stages are driven sequentially according to the set start-up priority. During the phased driving process of the internal force regulation device, the internal force response parameters of the indoor structure are continuously monitored, and the deviation ratio between the internal force response parameters and the parameters of the current stage internal force distribution is calculated. Based on the force transmission contribution and deviation ratio of different structural units in the target path, the deviation level is divided, and the adjustment range and adjustment rate of the internal force control device are determined in combination with the time required for the connection of the internal force distribution in each stage. After adjusting the operating parameters of the internal force control device according to the adjustment range and adjustment rate, monitor the internal force response parameters for the preset monitoring time until the deviation ratio meets the preset ratio threshold.

[0015] Optionally, the correction by adjusting the operating parameters of the internal force control device includes: Continuously monitor the internal force response parameters of the indoor structure, and integrate them to obtain the internal force distribution of the indoor structure; When the internal force distribution deviates from the allowable deviation range of the target internal force distribution in multiple consecutive time windows, it is determined to be a continuous deviation, and the deviation type is classified according to the force transmission contribution of the target path. Based on the accessibility level of the node and the time required for the connection of the force distribution within the stage, trace the continuously deviating force transmission section, and determine the correction parameters for the adjustment amplitude and adjustment rate based on the deviation type and the force transmission section respectively. Adjust the corresponding internal force control device's operating parameters according to the correction parameters until the internal force distribution falls back to the allowable deviation range of the target internal force distribution.

[0016] Compared with existing technologies, the beneficial effects of this application are as follows: by identifying the spatial constraint boundary formed by external obstacles to accurately define the feasible construction domain, interference between reinforcement construction and obstacles is avoided from the source, greatly improving the on-site adaptability and feasibility of the reinforcement scheme, and solving the problem of the disconnect between spatial constraints and reinforcement design in traditional technologies; by using the target internal force distribution as a constraint and generating a set of force transmission paths through topology optimization, and selecting the target path, the disturbance to the original structure during the reinforcement process is minimized while ensuring force transmission efficiency, thus achieving a unity of force transmission rationality and construction feasibility.

[0017] Based on the spatial accessibility of different nodes on the target path, the target internal force distribution is decomposed into stage internal force distribution, and the corresponding internal force control device layout scheme and timing are matched to achieve staged orderly driving and precise internal force control, avoiding internal force abrupt changes caused by one-time reinforcement and ensuring a smooth transition of structural stress. A closed-loop control system is constructed from real-time monitoring, stage adjustment to continuous deviation correction. By continuously tracking the internal force distribution of the structure, deviations are corrected in a timely manner, so that the internal force distribution is always kept within the allowable deviation range. This breaks through the limitation of only being able to monitor during the construction period and not being able to control it for a long time, and greatly improves the long-term load-bearing safety of the structure.

[0018] This application comprehensively considers the accessibility of nodes, construction sequence, and internal force control logic, taking into account both the feasibility of construction operations and the structural stress safety, to achieve refined, proactive, and long-term control of indoor structural reinforcement. It is applicable to the redistribution reinforcement of structural internal forces in complex indoor environments and has high engineering applicability and promotion value. Attached Figure Description

[0019] Figure 1 A flowchart illustrating a reinforcement method based on the redistribution of internal forces in an indoor structure, provided as an embodiment of this application; Figure 2 A logic flowchart for identifying spatial constraint boundaries provided in an embodiment of this application; Figure 3 This is a logical flowchart of the selected target path provided in the embodiments of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more pairs. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0021] refer to Figure 1 This is a flowchart illustrating a reinforcement method based on the redistribution of internal forces in an indoor structure, as provided in an embodiment of this application. The method includes: S1. Inspect the indoor structure to identify the spatial constraint boundary formed by external obstacles. The area within the spatial constraint boundary is the feasible region. Determine the target internal force distribution of the indoor structure according to the structural bearing capacity requirements.

[0022] like Figure 2 As shown, identifying spatial constraint boundaries includes: The system detects the spatial coordinates and component location distribution of the interior structure, and detects external obstacles within the pre-defined construction influence range at the edge of the interior structure, identifying the outline, spatial distribution, and fixation properties of the external obstacles. Based on the component location distribution of the indoor structure and the fixed properties of the external obstacles, the constraint levels of the external obstacles are classified, and rigid obstacles with high constraint levels are screened out. Based on the spatial coordinates of the interior structure, and combined with the outline and spatial distribution of rigid obstacles, the spatial constraint boundary formed by the rigid obstacles is delineated.

[0023] Indoor reinforcement construction must avoid external obstacles to prevent deviations in subsequent procedures caused by excessively wide or narrow inspection ranges. The parameters of the indoor structure are detected using a laser positioning instrument. During inspection, a three-dimensional rectangular coordinate system is established with the lower left corner of the indoor floor as the origin. The X-axis runs along the length of the interior, the Y-axis along the width, and the Z-axis along the height. A full-area scan of the indoor structure is performed, simultaneously acquiring the spatial coordinates of the structure and the location and dimensions of core components such as beams, columns, and walls. A calibration point is set every 1 meter during the scanning process to ensure the accuracy of the inspection data.

[0024] For example, a laser positioning instrument is used to inspect the indoor structure. After calibration, the spatial coordinates of the beam components are measured to be X∈[0m,10m], Y∈[2m,3m], and Z∈[3m,3.5m], with beam cross-section dimensions of 0.5m×0.3m. The spatial coordinates of the column components are (2m,5m,0m) and (8m,5m,0m), with column cross-section diameter of 0.6m. The walls are laid out along the X-axis at 0m and 10m, with a thickness of 0.2m and a wall height of 3m. The complete distribution and dimensions of all components are recorded as a reference for subsequent obstacle detection.

[0025] The detection of external obstacles is based on the edge of the indoor structure. Combined with the conventional operating radius of indoor reinforcement construction, the preset construction influence range is set to 50cm, that is, external obstacles within a range extending 50cm outward from the edge of the indoor structure are detected. The detection is carried out by linking a laser locator and a camera. The laser locator is responsible for acquiring the spatial coordinates of the obstacle, and the camera is responsible for acquiring the image of the obstacle. Then, the outline of the obstacle is fitted by the image recognition algorithm to clarify the outline of the external obstacle. The spatial coordinates of the external obstacle are recorded by the laser locator to determine its relative positional relationship with the indoor structural components and obtain the spatial distribution.

[0026] The fixed properties of the outer obstacles were determined by combining on-site investigation with material testing. Specifically, the mobility of the obstacles was judged by pushing and tapping, and the strength of concrete obstacles was tested by a rebound hammer to assist in determining the fixed properties. The fixed properties were divided into two categories: fixed and movable. Fixed obstacles are concrete components that cannot be moved by conventional construction methods, are integrated with the building structure, or have a strength of C30 or above. Movable obstacles are construction materials or equipment that can be manually moved and temporarily stacked.

[0027] For example, three external obstacles were detected within 50cm of the edge of the indoor structure. Obstacle 1 was a concrete pier with a strength of C35, dimensions of 1m length, 0.8m width, and 1.2m height, and spatial coordinates of X∈[10m,11m], Y∈[3m,3.8m], Z∈[0m,1.2m]. It did not loosen or move after being struck, and its fixed attribute was determined to be fixed. Obstacle 2 was a temporarily stacked steel pipe made of Q235 steel with a diameter of 0.1m. The first obstacle is 6m long, with spatial coordinates X∈[0m,6m], Y∈[-0.5m,-0.4m], Z∈[0m,0.1m]. It can be pushed manually and is therefore considered movable. The second obstacle is a wall extension that is integrated with the original wall. It is made of concrete with a strength of C30 and has outline dimensions of 2m long, 0.2m wide, and 3m high. Its spatial coordinates are X∈[2m,4m], Y∈[-0.5m,-0.3m], Z∈[0m,3m]. It is therefore considered fixed.

[0028] This provides a unified and accurate reference standard for subsequent obstacle constraint level classification and constraint boundary delineation; effectively eliminates interference from irrelevant obstacles, reduces invalid detection workload, and ensures the relevance of detection data; accurately distinguishes obstacle types, provides a basis for subsequent rigid obstacle screening, avoids including movable obstacles in the constraint boundary, ensures the rationality of constraint boundary delineation, and lays the foundation for subsequent processes.

[0029] External obstacles have varying degrees of constraint on construction. If all obstacles are considered as constraining boundary elements, the constraint boundary may be too broad or too narrow. Broad constraints will result in a small feasible domain, limiting the design space for force transmission paths, while narrow constraints will lead to collisions with obstacles during construction, affecting construction safety and progress. Based on the detected component location distribution of the indoor structure and the fixed attributes of external obstacles, the constraint levels of external obstacles are classified. A two-dimensional comprehensive evaluation method is adopted, setting the weight of fixed attributes at 0.6 and the weight of minimum distance from indoor structural components at 0.4. The constraint level is quantified by assigning values ​​and scoring.

[0030] In the fixed attributes, fixed (rigid obstacles) are assigned 60 points, and movable (flexible obstacles) are assigned 20 points. In the minimum spacing, the straight-line distance between the outer obstacle and the nearest indoor structural component is measured. A spacing ≤ 20cm (directly affecting construction operations) is assigned 40 points, 20cm < spacing ≤ 50cm (slightly affecting construction operations) is assigned 20 points, and a spacing > 50cm (not affecting construction operations) is assigned 0 points. The total score for the constraint level is calculated as the fixed attribute score + the spacing score. A total score ≥ 70 indicates a high constraint level, 40 ≤ total score < 70 indicates a medium constraint level, and a total score < 40 indicates a low constraint level.

[0031] During the implementation of the constraint level classification, parameters of each detected outer obstacle are checked, scores are calculated and constraint levels are evaluated one by one. At the same time, rigid obstacles with high constraint levels and fixed attributes, rigid obstacles with low and medium constraint levels, and all movable obstacles are screened out because they have weak construction constraint capabilities and are not included in the constituent elements of the spatial constraint boundary.

[0032] For example, three outer obstacles were classified and screened according to their constraint levels. Obstacle 1 (concrete pier, fixed attribute) had a minimum distance of 0m between it and the nearest beam member (Y=3m), a distance score of 40 points, a fixed attribute score of 60 points, and a total score of 100 points, thus being rated as a high constraint level and screened as a rigid obstacle. Obstacle 2 (temporary steel pipe, movable) had a minimum distance of 2m between it and the nearest column member (X=2m), a distance score of 0 points, a fixed attribute score of 20 points, and a total score of 20 points, thus being rated as a low constraint level and not screened. Obstacle 3 (wall extension section, fixed) had a minimum distance of 0m between it and the nearest column member (X=2m), a distance score of 40 points, a fixed attribute score of 60 points, and a total score of 100 points, thus being rated as a high constraint level and screened as a rigid obstacle. Finally, two rigid obstacles with high constraint levels were screened out: Obstacle 1 (concrete pier) and Obstacle 3 (wall extension section).

[0033] This allows for precise quantification of the constraint capacity of each outer obstacle, avoiding assessment bias caused by a single dimension and ensuring the scientific nature of constraint level classification. It also allows for the screening of rigid obstacles with high constraint levels to eliminate those that have no substantial impact on construction and structural stress. This ensures that subsequent constraint boundary delineation focuses on core constraint elements, preventing overly broad constraint boundaries that result in a small feasible domain, limiting the flexibility of path design, and avoiding overly narrow constraint boundaries that could lead to collisions with obstacles during construction, thus guaranteeing construction safety and progress.

[0034] The core function of the spatial constraint boundary is to define the feasible construction domain. The feasible domain is the basic spatial range for determining the distribution of internal forces of the target and generating the internal force transmission path. The spatial coordinates of the detected indoor structure are used as the reference (the three-dimensional rectangular coordinate system established above) to ensure that the coordinate system of the constraint boundary, the indoor structure and the rigid obstacle is consistent, and to avoid boundary offset caused by coordinate confusion. The spatial constraint boundary is delineated by using the reference extension and rigid obstacle contour fitting method. Specifically, the spatial coordinates of the outer contour of the indoor structure are used as the basis, and a preset safety distance of 10cm is extended to the outside of the indoor structure. This safety distance is used to avoid collision with indoor structural components during construction and to form the reference boundary on the side of the indoor structure.

[0035] Secondly, the outlines of the selected high-constraint rigid obstacles are re-measured to obtain the spatial coordinates of the rigid obstacle outlines. The outer contour boundaries of the rigid obstacles are then fitted using a B-spline curve fitting algorithm, serving as the constraint boundaries on the obstacle side. Finally, the reference boundary on the indoor structure side is connected and closed with the outer contour boundaries of all high-constraint rigid obstacles to form spatial constraint boundaries. The internal region of the spatial constraint boundaries is the feasible region, and the external region is the non-constructible region. The non-constructible region mainly consists of the area where the high-constraint rigid obstacles are located and the area beyond the reference boundary.

[0036] For example, the benchmark setting uses a three-dimensional rectangular coordinate system, and the origin and calibration points are re-measured to ensure that the benchmark coordinates are without deviation. The benchmark boundary on the interior structure side is based on the coordinates of the outer contour of the interior structure, extending outward by 10cm. The benchmark boundary coordinates of the outer side of the beam members are X∈[0m,10m], Y∈[1.9m,3.1m], Z∈[3m,3.5m], the benchmark boundary coordinates of the outer side of the wall are X∈[-0.1m,0.1m], Y∈[0m,10m], Z∈[0m,3m], and the benchmark boundary coordinates of the outer side of the column members are (2m±0.3m,5m±0.3m,0m) and (8m±0.3m,5m±0.3m,0m). The constraint boundary on the obstacle side is determined by re-measuring the contour of obstacle 1 (concrete pier). The coordinates of obstacle 1 and obstacle 3 (the wall extension section) are fitted to their outer contour boundaries as X∈[10m,11m], Y∈[3m,3.8m], Z∈[0m,1.2m]. The contour coordinates of obstacle 3 (the wall extension section) are remeasured, and its outer contour boundary is fitted to X∈[2m,4m], Y∈[-0.5m,-0.3m], Z∈[0m,3m]. The boundary closure adopts a straight line connection method, seamlessly connecting and closing the indoor structural side reference boundary with the outer contour boundaries of the two obstacles to form a spatial constraint boundary. The internal region of the boundary is X∈[-0.1m,11m], Y∈[-0.5m,10m], Z∈[0m,3.5m]. The contour regions of obstacles 1 and 3 are removed. This region is the feasible region, and all subsequent processing is carried out within this feasible region.

[0037] This ensures the precise relative position of the spatial constraint boundary and the interior structure, avoids deviation of the feasible region due to spatial constraint boundary offset, and guarantees the spatial adaptability of subsequent procedures; avoids collisions with obstacles during construction, ensuring smooth construction; clearly defines the feasible region, provides clear spatial constraint basis for subsequent treatment, ensures that the reinforcement plan fits the actual construction scenario, and improves the feasibility and scientific nature of the reinforcement plan.

[0038] Specifically, determining the target internal force distribution of the interior structure includes: The feasible region is defined as the area within the spatial constraint boundary. The actual load-bearing state of the indoor structure is detected based on the spatial range of the feasible region, and the load-bearing internal force threshold of different components is determined according to the requirements of structural load-bearing performance. Based on the spatial distribution of rigid obstacles, the bearing internal force thresholds of different components within the feasible domain are adjusted according to the correlation between component internal forces and deformation, thus forming the initial internal force distribution of the indoor structure within the feasible domain; Verify the spatial adaptability of the theoretical deformation of different components of the indoor structure to the feasible region under the initial internal force distribution. After calibrating the allowable deviation range of the target internal force distribution, determine the target internal force distribution of the indoor structure.

[0039] The different components of the indoor structure have different functional positioning, materials, and dimensions, resulting in varying load-bearing capacities. This makes it impossible to ensure that the adjusted internal force distribution meets the structural load-bearing performance requirements, thus affecting the reinforcement effect. The feasible region is defined as the area within the spatial constraint boundary to ensure that all testing work is carried out within the feasible region, avoiding the testing range from exceeding the spatial constraint boundary. The actual load-bearing state is detected by strain gauges and force sensors. Strain gauges are attached to the key stress points of each component within the feasible region. For beam components, they are attached at the mid-span and supports; for column components, they are attached at the top, bottom, and middle of the column; and for walls, they are attached at the middle and corners of the wall. Three strain gauges are attached to each stress point in a triangular arrangement to ensure the stability of the test data.

[0040] Force sensors are installed at the component connections to acquire force transmission data between components. By analyzing the relationship between strain and internal force, the actual internal force values ​​of each component are calculated. Column components are primarily subjected to axial force and vertical pressure. The actual axial force of a column component = concrete elastic modulus × measured average strain × cross-sectional area of ​​the column component. This is used to calculate the actual internal force value of the column component, as the column component experiences uniform stress and strain is uniformly distributed along the cross-section. Beam components are primarily subjected to bending. The actual bending moment of a beam component = concrete elastic modulus × measured average strain × moment of inertia of the beam cross-section ÷ distance from the edge of the beam cross-section to the neutral axis. This is used to calculate the actual internal force value of the critical cross-section of the beam component, as the strain of a beam under bending is linearly distributed along the cross-section, with the largest strain at the edge.

[0041] Wall components are primarily subjected to planar forces. Calculated per unit width, the actual linear internal force per unit width of the wall is calculated as follows: concrete elastic modulus × measured average strain × wall thickness. This yields the actual internal force value per unit width of the wall, adapting to the planar force characteristics of the wall. Combining the component material, dimensions, and corresponding design specifications, the load-bearing internal force threshold of each component is clearly defined. The load-bearing internal force threshold is the maximum internal force value that the component can withstand under normal use conditions. A certain safety margin must be reserved to prevent damage to the component due to overload.

[0042] For example, the feasible domain has a three-dimensional spatial coordinate range of X∈[-0.1m,11m], Y∈[-0.5m,10m], and Z∈[0m,3.5m]. The areas containing obstacle 1 (concrete pier) and obstacle 3 (wall extension) are excluded. The actual load-bearing state of the beams, columns, and walls within the feasible domain is tested. The beam is made of C30 concrete with a cross-sectional size of 0.5m×0.3m. After attaching strain gauges, the actual internal force value is 120kN·m. Based on the specifications, its load-bearing internal force threshold is determined to be 150kN·m. The column is made of C30 concrete with a cross-sectional diameter of 0.6m. The actual internal force value is 800kN, and its load-bearing internal force threshold is determined to be 1000kN. The wall is made of C25 concrete with a thickness of 0.2m. The actual internal force value is 300kN / m, and its load-bearing internal force threshold is determined to be 400kN / m. The load-bearing internal force thresholds of each component are recorded completely.

[0043] This ensures that the test data is highly compatible with subsequent construction and structural stress scenarios, avoids invalid testing, and improves testing efficiency and data relevance; it accurately detects the actual load-bearing state, and the identified load-bearing internal force thresholds of each component provide a reference standard for subsequent internal force distribution adjustments, ensuring that the adjusted internal force distribution does not exceed the component's load-bearing capacity, guaranteeing structural safety, and laying the foundation for the formation of the initial internal force distribution.

[0044] Rigid obstacles, as core components of spatial constraint boundaries, limit the deformation space of components within the feasible domain due to their spatial distribution. If the bearing internal force threshold is not adjusted in conjunction with the spatial distribution of rigid obstacles, the initial internal force distribution will only consider the component's own bearing capacity, ignoring the constraint of obstacles on component deformation. As a result, in the actual stress process, the deformation of the component will be unable to be realized due to the obstruction of obstacles, leading to local internal force concentration and affecting structural stability. First, the outline and spatial distribution of rigid obstacles with high constraint levels are retrieved to clarify the relative positional relationship between rigid obstacles and components within the feasible domain. A three-dimensional mechanical model of the indoor structure is established using finite element simulation software. Rigid obstacles are imported into the three-dimensional mechanical model as constraint conditions, and the obstacles are set as fixed constraints, which cannot be displaced or deformed.

[0045] Based on the correlation between internal forces and deformation of components, the theoretical deformation of each component under different internal forces is obtained through simulation analysis, clarifying the quantitative correlation law between internal forces and deformation, namely, as internal forces increase, the deformation of the component increases linearly. Then, for components within the feasible domain that are close to rigid obstacles (spacing ≤ 50cm), their deformation space is restricted by the obstacles, so their bearing internal force threshold needs to be reduced to avoid excessive deformation due to excessive internal forces, which could lead to collisions with the obstacles. For components that are far from rigid obstacles (spacing > 50cm), their deformation space is not restricted, and the original bearing internal force threshold can be maintained unchanged. During the adjustment process, it is ensured that the adjusted bearing internal force threshold of each component is not lower than its actual detected internal force value and does not exceed the original bearing internal force threshold to ensure the load-bearing safety of the components. After the adjustment is completed, the adjusted bearing internal force thresholds of each component are integrated to form the initial internal force distribution of the indoor structure within the feasible domain.

[0046] For example, using ANSYS, a three-dimensional mechanical model is built for obstacle 1 (concrete pier, X∈[10m,11m], Y∈[3m,3.8m], Z∈[0m,1.2m]) and obstacle 3 (wall extension, X∈[2m,4m], Y∈[-0.5m,-0.3m], Z∈[0m,3m]). The constraints of the rigid obstacle are imported, and simulations show that the minimum distance between the beam member (X∈[0m,10m], Y∈[2m,3m]) and obstacle 1 is 0m, and the deformation space is limited. Therefore, the bearing capacity threshold is adjusted from 150kN·m to 130kN·m. The minimum distance between the column member (X=8m, Y=5m) and obstacle 1 is 1.2m, and the deformation space is unrestricted. The bearing capacity threshold is maintained at 1000kN. The minimum distance between the wall (X∈[2m,4m], Y∈[0m,10m]) and obstacle 3 is 0.3m, and the deformation space is slightly restricted. The bearing capacity threshold is adjusted from 400kN / m to 360kN / m. Other components are kept at their original bearing capacity thresholds because they are far from the obstacle. The initial internal force distribution is formed by integrating the adjusted thresholds of all components. The initial internal force value of the beam component is set to 120kN·m (not exceeding the adjusted threshold of 130kN·m), the initial internal force value of the column component is set to 800kN (not exceeding the threshold of 1000kN), and the initial internal force value of the wall is set to 300kN / m (not exceeding the adjusted threshold of 360kN / m).

[0047] This fully considers the limiting effect of obstacles on component deformation, avoiding a disconnect between the initial internal force distribution and the actual constraint conditions; ensuring that the adjusted internal force distribution not only meets the component's load-bearing performance requirements but also adapts to the spatial constraints of the feasible domain, avoiding local internal force concentration caused by deformation restrictions, and ensuring structural stress balance; the initial internal force distribution provides a basis for subsequent treatment, improving the feasibility and scientific nature of the entire reinforcement scheme.

[0048] The initial internal force distribution is based on theoretical analysis and parameter adjustment, and has not been verified for actual adaptability. The theoretical deformation of the corresponding components may exceed the spatial range of the feasible domain, or interfere with rigid obstacles, making it impossible to achieve the internal force distribution in actual construction. The initial internal force distribution is used as an input condition, and the theoretical deformation of each component in the feasible domain is calculated by simulation using a three-dimensional mechanical model to determine the spatial coordinates of each component after deformation. During the verification process, the focus is on determining whether the theoretical deformation of each component exceeds the spatial range of the feasible domain (i.e., spatial adaptability), whether it overlaps with the contour of rigid obstacles (i.e., whether the component collides with the obstacle after deformation), and whether the theoretical deformation is within the allowable deformation range of the component.

[0049] If the theoretical deformation exceeds the feasible range, there is a collision with an obstacle, or the deformation exceeds the allowable range of the component, the load-bearing internal force threshold is readjusted until the verification is qualified. If the verification is qualified, the deviation range calibration stage begins. That is, based on the initial internal force distribution, combined with the load-bearing capacity of the component, the allowable range of construction error, and the influence of environmental factors, statistical analysis methods are used to calibrate the allowable deviation range of the internal force distribution of each component. The deviation range must be controlled within the range that does not affect the structural load-bearing safety and does not cause the component deformation to exceed the feasible range. The upper and lower limits of the internal force deviation of the same component must be set symmetrically, and the absolute value of the deviation does not exceed 10% of the initial internal force value. After calibration, the initial internal force distribution and the allowable deviation range are integrated to determine the target internal force distribution of the indoor structure. The target internal force distribution is the internal force benchmark value of each component and the corresponding deviation range.

[0050] For example, using the ANSYS simulation model, the initial internal force distribution is input, and the theoretical deformation of each component is calculated. The theoretical deformation of the beam component at mid-span is 2.5mm. After deformation, the spatial coordinates are still within the feasible region, and there is no collision with obstacle 1. Moreover, it is less than the allowable deformation of the beam component (3mm). The theoretical deformation of the column component is 1.2mm. After deformation, it does not exceed the feasible region, and there is no collision problem. The theoretical deformation of the wall is 0.8mm, which meets the allowable deformation requirements, and the adaptability verification is qualified. The deviation range is calibrated based on the initial internal force distribution. The initial internal force value of the beam component is 120kN·m, and the deviation range is calibrated to ±12kN·m. N·m (not exceeding 10% of the initial value); the initial internal force value of column members is 800kN, with a deviation range of ±80kN; the initial internal force value of walls is 300kN / m, with a deviation range of ±30kN / m; after integration, the target internal force distribution is determined: the target internal force of beam members is 120kN·m±12kN·m, the target internal force of column members is 800kN±80kN, and the target internal force of walls is 300kN / m±30kN / m. This target internal force distribution not only meets the load-bearing performance requirements of the members, but also adapts to the spatial constraints of the feasible domain, and clearly defines the allowable deviation range, providing a clear reference for subsequent processing.

[0051] This allows for precise identification of the compatibility between component deformation and the feasible region under the initial internal force distribution, avoiding construction difficulties or structural safety hazards caused by deformation interference, and ensuring the feasibility of the initial internal force distribution. It also calibrates the allowable deviation range of the target internal force distribution, providing a clear basis for subsequent internal force monitoring, control, and correction, avoiding over-control or untimely control due to the lack of deviation standards. Furthermore, it considers the impact of construction errors and environmental factors, improving the practicality and flexibility of the target internal force distribution. Finally, the target internal force distribution provides core mechanical basis for subsequent treatment, ensuring the scientific validity and feasibility of the entire reinforcement scheme.

[0052] S2. With the target internal force distribution as a constraint, a set of force transmission paths is generated in the feasible region through topology optimization. Based on the structural perturbation degree, control feasibility and spatial accessibility of nodes, the target path is selected from the set of force transmission paths.

[0053] Furthermore, generating the force transmission path set includes: Using the feasible region as a spatial constraint and the target internal force distribution as a mechanical constraint, the area where rigid obstacles are located within the feasible region is set as a path prohibition zone, and the internal force values ​​corresponding to the target internal force distribution are extracted to determine the error limit of internal force transmission. The feasible region is divided into multiple structural units, with the optimization objective being to satisfy the error limits of spatial constraints and internal force transmission, and to avoid entering the path prohibition zone. Based on the optimization objective, the force transmission contribution of different structural units is calculated using a topology optimization algorithm, and internal force transmission paths with a force transmission contribution greater than a preset contribution threshold are retained. The force transmission path set is then generated iteratively.

[0054] The generation of internal force transmission paths must simultaneously meet two core requirements: spatial feasibility and mechanical rationality. The feasible region serves as the spatial constraint, and the target internal force distribution as the mechanical constraint. The internal force values ​​corresponding to each component in the target internal force distribution are used as the benchmark force index for force transmission. The spatial coordinate range occupied by identified high-constraint rigid obstacles within the feasible region is uniformly marked as a path prohibition zone. This zone does not participate in structural unit division and force transmission calculation during subsequent path generation, and no internal force transmission path is allowed to cross or cover it. The internal force values ​​of each component in the beams, columns, and walls of the target internal force distribution are extracted. Combining the conventional engineering requirements for structural force control, the error limit for internal force transmission is set as a fixed proportion of the internal force values ​​corresponding to the target internal force distribution. This error limit is used to determine whether the path force transmission meets the accuracy requirements.

[0055] For example, the feasible domain spatial coordinates are X∈[-0.1m,11m], Y∈[-0.5m,10m], Z∈[0m,3.5m], and the path prohibition zone is the coordinate range corresponding to the concrete pier (X∈[10m,11m], Y∈[3m,3.8m], Z∈[0m,1.2m]) and the wall extension (X∈[2m,4m], Y∈[-0.5m,-0.3m], Z∈[0m,3m]); the target internal force distribution of the beam member is... The internal force transmission error limit is set at ±5% of the target internal force value, with a target internal force of 120 kN·m for beam members, 800 kN for column members, and 300 kN / m for walls. Specifically, the internal force transmission error limit is ±6 kN·m for beam members, ±40 kN for column members, and ±15 kN / m for walls. The final force transmission result for all paths must fall within this error limit range. The units mentioned above conform to structural mechanics specifications, and different components use corresponding units, which is a reasonable distinction between units for different components.

[0056] This eliminates invalid paths that do not meet spatial conditions and stress requirements from the source, completely avoids spatial conflicts between internal force transmission paths and rigid obstacles, and ensures that subsequent paths can be adapted to on-site construction conditions. The error limit of internal force transmission provides a quantitative basis for judging the effectiveness of internal force transmission paths, so that the calculation direction of subsequent topology optimization is consistent with the evaluation criteria, and avoids the topology optimization results from deviating from the actual engineering situation.

[0057] Since the feasible region is a continuous space, it is not possible to directly quantify the force transmission capacity. The continuous space needs to be discretized into several independent and computable structural units in order to achieve accurate analysis of the force transmission characteristics of each region. The finite element discretization method is used to divide the entire feasible region into a structured mesh. The meshing scale is determined based on the actual size of the indoor structural components. Linear components such as beams and columns are divided into equal-spacing meshes, while planar components such as walls are divided into rectangular meshes. The size of the structural units on the same component is consistent, and the boundaries of structural units between different components are connected to each other without overlapping or missing areas.

[0058] After the division is completed, each structural unit is assigned a number, and the correspondence between the coordinates of the structural unit and the position of the component is established. The optimization objective is defined as three parallel constraints: first, all structural units and the paths composed of them are within the spatial constraints of the feasible region; second, the internal force transmission results of the internal force transmission path meet the aforementioned internal force transmission error limit; and third, the internal force transmission path does not enter any path prohibition zone. All three conditions must be met simultaneously for the topology optimization to be considered convergent.

[0059] For example, beam members (X∈[0m,10m], Y∈[2m,3m], Z∈[3m,3.5m]) within the feasible region are divided into structural units of 0.5m length, for a total of 20 units (numbered 1-20); column members (coordinates (2m,5m,0m), (8m,5m,0m)) are divided into units of 0.8m height, with each column member divided into 4 units, for a total of 8 units (numbered 21-28); walls (X∈[0m,10m], Y∈[0m,10m], Z∈[0m,3m]) are divided into 32 units (numbered 29-60) using a 0.5m×0.5m rectangular grid. The entire feasible region is planned to be divided into 60 structural units. All structural units avoid path-forbidden areas, and the optimization objective is set to simultaneously satisfy the above three constraints.

[0060] This transforms continuous space into computable and analyzable structured units, providing a platform for the quantitative calculation of force contribution; the optimization objective provides a clear iterative direction for topology optimization algorithms, avoiding unconstrained divergent calculations and improving the efficiency and compliance of path generation.

[0061] Force transmission contribution is a core indicator for measuring the ability of structural units to participate in internal force transmission. Inefficient and redundant force transmission paths need to be eliminated. A variable density topology optimization algorithm is used for processing. The core components of the constructed computational model include input parameters, constraints, and optimization objectives, as follows: Input parameters include the geometric parameters (unit size, spatial coordinates) and material parameters (consistent with interior structural components; beams and columns are C30 concrete with an elastic modulus of 3.0 × 10⁻⁶). 4 MPa, Poisson's ratio 0.2; the wall is C25 concrete with an elastic modulus of 2.8 × 10⁻⁶. 4 The error limits (±5%) for the target internal force distribution (120kN·m for beams, 800kN for columns, and 300kN / m for walls) and the internal force transmission (MPa, Poisson's ratio 0.2).

[0062] The constraints include spatial constraints (structural units and paths are located within the feasible region), forbidden zone constraints (structural units and paths do not enter rigid obstacle areas), and mechanical constraints (path force transmission error does not exceed the error limit). Simultaneously, a density variable for the structural units is set, with a value range of 0-1. Density = 1 indicates that the structural unit fully participates in force transmission, while density = 0 indicates that the structural unit does not participate in force transmission. The optimization objective is to maximize the overall force transmission efficiency of the structure and minimize force transmission loss while satisfying all constraints. This is achieved by iteratively adjusting the density value of each structural unit through an algorithm to optimize the force transmission efficiency.

[0063] The calculation process consists of four steps. The first step is initialization, where the initial density value of all structural elements is set to 0.5, i.e., a neutral initial state. The stiffness matrix and internal force distribution coefficients are initialized, and the iteration convergence condition is set, i.e., the difference in force transmission efficiency between two adjacent iterations is ≤0.001, and the maximum number of iterations is 100. The second step is stiffness calculation, which uses the finite element stiffness formula K=∑ρ based on the density value, geometric parameters, and material parameters of each structural element. e K 0e , where ρ e Let K be the density of the e-th unit. 0e Given the stiffness matrix of the element with density = 1, calculate the overall stiffness matrix of the entire feasible region. Simultaneously, combining the target internal force distribution, solve for the internal force distribution values ​​of each element through the static equilibrium equation.

[0064] The third step is to convert the force transmission contribution. The internal force distribution value of each element is compared with the target internal force value. Structural elements whose force transmission error exceeds the error limit are eliminated. For structural elements that meet the error requirements, the force transmission contribution is converted according to the formula: force transmission contribution = element internal force distribution value / corresponding component target internal force value. After conversion, the force transmission contribution value ranges from 0 to 1. The higher the value, the more critical the force transmission effect of the element. The fourth step is iterative optimization. The density value of the structural elements is adjusted according to the force transmission contribution. For structural elements with high force transmission contribution (tentatively set at ≥0.3), the density value is adjusted towards 1 (each adjustment increment is 0.05). For structural elements with low force transmission contribution (<0.3), the density value is adjusted towards 0. After adjustment, the stiffness matrix, internal force distribution value and force transmission contribution are recalculated. The second to fourth steps are repeated until the convergence condition is met.

[0065] The preset contribution threshold is determined by combining the force transmission path optimization criteria and the stress level of the structure. Here it is used for the screening of structural elements, that is, to retain efficient elements. Therefore, the preset contribution threshold is 0.3. After the iteration converges, inefficient elements with a force transmission contribution of less than 0.3 are removed. Continuously distributed elements with a density value ≥ 0.8 and satisfying all constraints are combined into internal force transmission paths. Each path covers the force transmission link from the stressed component to the force transmission component to avoid force transmission interruption.

[0066] For example, after 68 iterations, the computational model reached convergence. The difference in force transmission efficiency between two adjacent iterations was 0.0008. The calculated force transmission contribution of each structural element was between 0.08 and 0.92. Among them, the force transmission contribution of elements numbered 1-8, 15-20 (beam elements), 21-24, 27-28 (column elements), 30-35, and 40-45 (wall elements) was greater than 0.3, while the force transmission contribution of the remaining elements was less than 0.3 and was discarded. The continuously distributed high-contribution elements were combined into 5 internal force transmission paths. Path 1 consists of beam elements 1-5, column elements 21-22, and wall elements 30-32, covering the left end of the beam to the left column and the adjacent wall. Force transmission links: Path 2 consists of beam elements 6-8, column elements 23-24, and wall elements 33-35, covering another force transmission link from the left end of the beam to the left column; Path 3 consists of beam elements 15-17, column elements 27-28, and wall elements 40-42, covering the force transmission link from the right end of the beam to the right column and adjacent walls; Path 4 consists of beam elements 18-20, column elements 27-28, and wall elements 43-45, covering another force transmission link from the right end of the beam to the right column; Path 5 consists of wall elements 30-35 and 40-45, covering the auxiliary force transmission link between walls. The above paths together form a set of force transmission paths. All paths meet spatial constraints and error limits, and do not enter the path prohibition zone.

[0067] This enables objective quantitative calculation of force transmission contribution, avoiding the subjectivity and arbitrariness of manual path division and ensuring the reproducibility of the calculation process. Filtering paths according to contribution thresholds simplifies the structure of the force transmission path set, retains efficient force transmission routes, and reduces the complexity of subsequent path selection. Iterative calculation eliminates errors and fluctuations in single calculations, keeping the mechanical properties and spatial adaptability of the force transmission path set stable, while ensuring that the path set meets all the defined conditions to ensure the implementation effect of the overall reinforcement scheme.

[0068] like Figure 3 As shown, the selected target path specifically includes: The disturbance amplitude of the indoor structure caused by each internal force transmission path in the detection force transmission path set is determined by combining the allowable deviation range of the target internal force distribution. The node layout space and the matching dimensions of the internal force control device for each internal force transmission path are detected to determine the feasibility of control. The minimum distance between different nodes and rigid obstacles on each internal force transmission path is also detected to determine the spatial accessibility of the nodes. The system assesses the suitability of structural disturbance degree, control feasibility, and spatial accessibility of nodes. If all conditions are met, the corresponding internal force transmission path is selected as a candidate path, with priority given to candidate paths whose structural disturbance degree is less than a preset amplitude threshold as the target path.

[0069] During the transmission of internal forces, the path will disturb the original stress state of the indoor structure. If the disturbance is too large, it will cause the internal forces of the structure to exceed the allowable deviation range of the target internal force distribution, resulting in overload or abnormal deformation of local components. The method of linking finite element simulation and on-site measurement is used to detect the structural disturbance amplitude of each internal force transmission path when transmitting internal forces. According to the above topology optimization calculation model, the internal force transmission parameters (internal force value, force transmission efficiency) of each path in the force transmission path set are used as input to simulate the change of internal forces of each component of the indoor structure when the internal force transmission path transmits internal forces. This change of internal forces is the disturbance amplitude. During the simulation, the target internal force distribution and spatial constraints are kept unchanged to ensure the accuracy of disturbance amplitude detection.

[0070] Simultaneously, strain gauges were used to conduct on-site measurements on key components of the indoor structure to obtain the strain changes of the components under the force transmission state of the internal force transmission path, and to verify the disturbance amplitude obtained from the simulation. Based on the allowable deviation range of the target internal force distribution, the disturbance amplitude of each internal force transmission path was compared with the deviation range of the corresponding component. The structural disturbance degree was calculated according to the formula: structural disturbance degree = disturbance amplitude / upper limit of the target internal force deviation range of the corresponding component. The numerical range of the structural disturbance degree is 0 to 1. The smaller the value, the smaller the disturbance of the internal force transmission path to the structure. The value exceeding 1 indicates that the disturbance amplitude exceeds the deviation range, and there is a structural safety risk.

[0071] For example, the allowable deviation range for the target internal force distribution is: ±12 kN·m for beam members (maximum deviation 12 kN·m), ±80 kN for column members (maximum deviation 80 kN), and ±30 kN / m for walls (maximum deviation 30 kN / m). Through simulation and actual measurement linkage detection, the disturbance amplitude of 5 paths is obtained. The disturbance amplitude of beam members in path 1 is 4.8 kN·m, column members 32 kN, and walls 12 kN / m, with structural disturbance degrees of 4.8 / 12=0.4, 32 / 80=0.4, and 12 / 30=0.4, respectively. The average value of the comprehensive disturbance degree is 0.4. The disturbance amplitude of beam members in path 2 is... The disturbance amplitude for path 3 is 5.4 kN·m, for column members 36 kN, and for walls 13.5 kN / m, with a comprehensive disturbance degree of 0.45. The disturbance amplitude for beam members in path 4 is 6 kN·m, for column members 40 kN, and for walls 15 kN / m, with a comprehensive disturbance degree of 0.5. The disturbance amplitude for beam members in path 5 is 7.2 kN·m, for column members 48 kN, and for walls 18 kN / m, with a comprehensive disturbance degree of 0.6. The disturbance amplitude for beam members in path 5 is 2.4 kN·m, for column members 16 kN, and for walls 6 kN / m, with a comprehensive disturbance degree of 0.2. The structural disturbance degree for all paths is less than 1, which is within the deviation range and there is no obvious disturbance risk.

[0072] This ensures the accuracy and reliability of disturbance amplitude detection, avoiding errors caused by a single detection method; by combining the target internal force deviation range to determine the degree of structural disturbance, the degree of disturbance is quantified, providing a judgment standard for path selection, which can effectively eliminate paths with excessive disturbance that may affect structural safety, ensuring the structural stability of the reinforcement process, and ensuring the layout effect of the internal force control device and the overall reinforcement quality.

[0073] The selected target path must be feasible for actual construction; it is divided into two parts: control feasibility testing and node spatial accessibility testing, both of which rely on on-site measurements and parameter comparisons. In terms of control feasibility testing, the adaptable dimensions of the internal force control device are first determined, with the device base size set at 0.3m × 0.3m and the minimum space height required for installation at 0.5m. A laser positioning instrument is used to detect the layout spatial parameters of all nodes on each internal force transmission path, including the node's planar area (the usable planar dimension of the node's location) and spatial height (the usable height above the node). The detected node layout spatial parameters are compared with the adaptable dimensions. If the node's planar area is greater than or equal to the base size and the spatial height is greater than or equal to the minimum installation height, then the node is considered controllable. If all nodes along the entire path are controllable, then the entire path is considered controllable. If any node is not controllable, then the entire path is considered not controllable.

[0074] In terms of node spatial accessibility testing, a laser rangefinder was used to detect the minimum distance between different nodes and rigid obstacles on each internal force transmission path. Combined with the conventional operating space requirements for indoor structural reinforcement construction, a standard for judging node spatial accessibility was set: if the minimum distance is ≥0.4m, construction personnel can operate normally and it is judged as accessible (qualified); if 0.2m≤minimum distance<0.4m, construction personnel need to use auxiliary tools to operate and it is judged as accessible (qualified); if the minimum distance<0.2m, construction personnel cannot approach the node and it is judged as inaccessible (unqualified); when all nodes on each path are accessible, the node spatial accessibility of the internal force transmission path is judged as qualified; if any node is inaccessible, the accessibility of the path is judged as unqualified.

[0075] For example, the test results show that path 1 contains 8 nodes, with the spatial area of ​​each node being ≥0.3m × 0.3m and the height being ≥0.5m, making adjustment feasible. The minimum distance between the nodes and rigid obstacles (wall extensions) is 0.5m, and all are ≥0.4m, indicating satisfactory spatial accessibility. Path 2 contains 7 nodes, with the spatial arrangement of each node meeting the device's adaptation dimensions, making adjustment feasible. The minimum distance between the nodes and wall extensions is 0.45m, indicating satisfactory accessibility. Path 3 contains 9 nodes... The placement space of all nodes meets the adaptation requirements and is controllable. The minimum distance between the nodes and the concrete pier is 0.6m, and the accessibility is qualified. Path 4 contains 8 nodes, one of which is located near the concrete pier. The plane area of ​​the placement space is 0.25m×0.25m < 0.3m×0.3m, which cannot be adapted to the device and is not controllable. Path 5 contains 6 nodes. The placement space of the nodes meets the adaptation requirements and is controllable. The minimum distance between the nodes and the wall extension is 0.3m, and the accessibility is qualified.

[0076] This enables precise detection of the feasibility of regulation and the accessibility of node space, effectively eliminating paths where the device cannot be installed or where construction personnel cannot operate, ensuring that the selected path has the actual construction conditions; it also provides a reference for the subsequent layout of internal force regulation devices, avoiding the inability to achieve precise internal force regulation and affecting the reinforcement effect.

[0077] The force transmission path set includes multiple candidate paths. First, the qualification criteria for three indicators are defined: structural disturbance degree ≤ preset amplitude threshold, control feasibility qualified, and node space accessibility qualified. When all three indicators are met, the path is determined to be a candidate path. If any one indicator is unqualified, the path is eliminated and not included in the candidate path range. In combination with the safety requirements of indoor structural reinforcement, the preset amplitude threshold is set to 0.6, that is, the disturbance degree does not exceed 60% of the upper limit of the deviation range, to ensure that the disturbance is within a safe and controllable range.

[0078] After screening candidate paths, the structural disturbance degree of the candidate paths is sorted, and the candidate path with the smallest structural disturbance degree less than the preset amplitude threshold is selected as the target path. If there are multiple paths with the same disturbance degree and all of them are the minimum, the path with the highest force transmission efficiency can be selected as the target path based on the force transmission efficiency of the path, so as to ensure that the target path is both safe and efficient.

[0079] For example, with a preset amplitude threshold of 0.6, five paths are evaluated for eligibility. Path 1 (disturbance degree 0.4, controllability feasible, accessibility qualified), Path 2 (disturbance degree 0.45, controllability feasible, accessibility qualified), Path 3 (disturbance degree 0.5, controllability feasible, accessibility qualified), and Path 5 (disturbance degree 0.2, controllability feasible, accessibility qualified) all meet the eligibility criteria and are thus selected as candidate paths. Path 4 is eliminated because controllability is not feasible. The candidate paths are then sorted by structural disturbance degree. Path 5 (0.2) < Path 1 (0.4) < Path 2 (0.45) < Path 3 (0.5). Path 5 has the smallest structural disturbance degree and is less than the preset amplitude threshold. Therefore, Path 5 is selected as the target path. The specific parameters of Path 5 are: composed of wall units 30-35 and 40-45, covering the auxiliary force transmission link between walls, structural disturbance degree 0.2, all nodes are controllable, the minimum distance between nodes and rigid obstacles is 0.3m, accessibility is qualified, and force transmission efficiency meets the requirements.

[0080] This ensures that candidate paths meet both safety and construction requirements, eliminates unqualified paths, and reduces subsequent construction risks. Prioritizing paths with minimal structural disturbance minimizes structural disturbance during reinforcement, ensuring the stability of the original stress state and improving the accuracy of internal force control. This ensures that the target path can efficiently and safely transfer internal forces, laying the foundation for the subsequent deployment and timing of internal force control devices to achieve the expected effect of internal force redistribution and ensuring the quality of reinforcement implementation.

[0081] S3. Based on the spatial accessibility of different nodes on the target path, the target internal force distribution is decomposed into the stage internal force distribution of different construction stages. Based on the stage internal force distribution and the target path, the layout scheme and timing of the internal force control device are determined within the feasible domain.

[0082] The internal force control device of this application is an execution device for realizing the redistribution of internal forces and phased reinforcement of indoor structures. It is used to apply controllable mechanical forces or prestress to structural components such as beams, columns and walls at the node positions of the target path, actively adjust the distribution of internal forces in the indoor structure, and stabilize the internal forces in the indoor structure within the allowable deviation range of the target internal force distribution. In combination with the specific engineering scenario below, the internal force control device is a prestress control device for indoor structures, which is suitable for the reinforcement needs of wall, beam and column components.

[0083] Furthermore, the internal force distribution during the decomposition stage includes: Based on the spatial accessibility of nodes on the target path and the fixed properties of rigid obstacles, the accessibility level of nodes is divided, and the relationship between accessibility level and internal force transmission is established by combining the force transmission contribution and the internal force value gradient of the target internal force distribution. Based on the correlation, the construction stages are divided according to the accessibility level, and the internal force values ​​of the target internal force distribution are broken down according to the internal force transmission requirements of different construction stages to obtain the initial stage internal force distribution. Verify the matching between the initial stage internal force distribution and the spatial accessibility of nodes in the corresponding construction stage, and determine the stage internal force distribution for different construction stages after correcting the matching deviation.

[0084] The construction operation conditions of different nodes on the target path vary significantly due to spatial accessibility and rigid obstacles. Rigid obstacles are fixed and immovable components that directly compress the operation and layout space of nodes. If nodes are not classified into accessibility levels according to construction conditions, there will be no basis for orderly classification in subsequent construction stages. First, the minimum distance between each node on the target path and the rigid obstacle that has been tested is retrieved. At the same time, the fixed properties of the rigid obstacle are used as constraints to establish the classification rules for node accessibility levels.

[0085] Accessibility is divided into three levels: high accessibility nodes are those where the minimum distance between the node and a rigid obstacle is not less than 0.4m, and construction personnel can complete the installation, debugging and operation of the internal force control device without auxiliary tools; medium accessibility nodes are those where the minimum distance between the node and a rigid obstacle is between 0.2m and 0.4m, and simple auxiliary tools are required to complete the operation; low accessibility nodes are those where the minimum distance between the node and a rigid obstacle is less than 0.2m, the operating space is limited, and the work can only be carried out after the previous procedures are completed.

[0086] After completing the classification, the force transmission contribution of the structural unit corresponding to the target path and the internal force gradient of the target internal force distribution are extracted. The internal force gradient is sorted from high to low according to the internal force of the component, representing the priority of internal force transmission. On this basis, the correlation relationship is established, that is, high accessibility level nodes correspond to high force transmission contribution units and high internal force gradient tasks, medium accessibility level nodes correspond to medium force transmission contribution units and medium internal force gradient tasks, and low accessibility level nodes correspond to low force transmission contribution units and low internal force gradient tasks, so that the node construction conditions and internal force transmission requirements form a corresponding stable relationship.

[0087] For example, path 5 contains 6 core nodes, numbered N1 to N6. The rigid obstacles within its feasible region are concrete piers and wall extensions, all of which are fixed and immovable at a high constraint level. Testing revealed that the minimum distances between each node and the rigid obstacles are N1=0.5m, N2=0.45m, N3=0.3m, N4=0.28m, N5=0.18m, and N6=0.15m, respectively. According to the classification rules, N1 and N2 are classified as high accessibility, N3 and N4 as medium accessibility, and N5 and N6 as low accessibility. The force transmission contribution of the structural units corresponding to the target path is between 0.72 and 0.88, with N1 and N2 corresponding to the force transmission contributions... The degrees are 0.85 and 0.88, N3 and N4 are 0.78 and 0.75 respectively, and N5 and N6 are 0.72 and 0.73 respectively; the gradient of the internal force distribution of the target internal force is divided into three levels: the main force transmission section of the wall is 300kN / m with a high gradient, the secondary force transmission section is 270kN / m with a medium gradient, and the auxiliary force transmission section is 240kN / m with a low gradient; the established correlation is that high accessibility nodes N1 and N2 are matched with high gradient internal force 300kN / m and high force transmission contribution unit, medium accessibility nodes N3 and N4 are matched with medium gradient internal force 270kN / m and medium force transmission contribution unit, and low accessibility nodes N5 and N6 are matched with low gradient internal force 240kN / m and low force transmission contribution unit.

[0088] This enables the objective quantification of construction conditions at each node, avoiding the disorder caused by manual division; the established relationships ensure that the logic of construction implementation and the logic of structural stress are consistent, avoiding the mismatch between construction conditions and internal force control requirements from the source, and providing a stable constraint basis for subsequent construction stage division and internal force decomposition.

[0089] Nodes with different accessibility levels do not meet the conditions for simultaneous construction. High-accessibility nodes can be prioritized for operation, while low-accessibility nodes must wait for construction space to be released before implementation. Based on the correlation between accessibility level and internal force transmission, construction stages are divided according to the principle of prioritizing high accessibility and delaying low accessibility. Each construction stage corresponds only to nodes of the same accessibility level, ensuring that the construction conditions of all nodes within the same stage are consistent. When decomposing the target internal force value, the matching rules of the correlation are strictly followed, and the distribution is carried out according to the proportion of internal force gradient and force transmission contribution of each stage. After decomposition, the sum of the internal force values ​​of each stage is consistent with the total internal force value of the target internal force, and the internal force value of a single stage does not exceed the bearing internal force threshold of the corresponding component, ensuring that the internal force of the stage meets the internal force transmission and structural safety requirements of that stage. After the decomposition is completed, each construction stage, corresponding node, and stage internal force value are integrated to form the initial stage internal force distribution.

[0090] For example, based on accessibility levels, the construction is divided into three stages: Stage 1 corresponds to high accessibility nodes N1 and N2, Stage 2 corresponds to medium accessibility nodes N3 and N4, and Stage 3 corresponds to low accessibility nodes N5 and N6. The total internal force of the wall in the target internal force distribution is 300 kN / m. Based on correlation and force transmission contribution ratio, Stage 1 is allocated 150 kN / m, accounting for 50% of the total internal force, matching the high-gradient force transmission requirement; Stage 2 is allocated 90 kN / m, accounting for 30% of the total internal force, matching the medium-gradient force transmission requirement; and Stage 3 is allocated 60 kN / m, accounting for 20% of the total internal force, matching the low-gradient force transmission requirement. The internal force values ​​in each stage do not exceed the wall component's bearing capacity threshold. Integrating these parameters yields the initial stage internal force distribution: Stage 1 internal force 150 kN / m, Stage 2 internal force 90 kN / m, and Stage 3 internal force 60 kN / m.

[0091] This ensures that the construction sequence is fully aligned with the on-site operating conditions, improving the rationality and feasibility of the construction organization; by breaking down the overall internal forces according to the stage-based force transmission requirements, the internal force control is segmented and refined, avoiding structural internal force fluctuations caused by overall control, and providing a theoretical basis for subsequent stage-driven internal force control devices.

[0092] The initial stage internal force distribution is obtained from theoretical decomposition and has not been verified for adaptability to actual construction conditions. This may result in mismatches between the stage internal force values ​​and the spatial accessibility of the corresponding nodes. For example, the internal force allocation in the low accessibility stage may be too high, exceeding the node's control capability, or the internal force in the high accessibility stage may be too low, failing to meet the force transmission requirements. Using a single construction stage as a verification unit, the adaptation status of the initial stage internal force distribution and the spatial accessibility of the corresponding stage nodes is verified one by one. The verification includes whether the stage internal force value matches the node accessibility level, whether the stage internal force transmission is limited by the node's operating space, and whether the internal force control operation can be completed under the node's accessibility conditions. If a stage has a mismatch between the internal force value and the accessibility level, or if the control operation cannot be implemented, it is determined to be a matching deviation. Based on the correlation, the internal force decomposition ratio is readjusted to reduce the internal force value of the mismatched stage, and the difference is allocated to the high accessibility stage. The verification is repeated until all stages meet the matching requirements. After the verification is passed, the corrected internal force values ​​of each stage are determined as the stage internal force distribution.

[0093] For example, the initial stage internal force distribution is verified stage by stage. Stage 3 corresponds to low-accessibility nodes N5 and N6, with an initial internal force value of 60 kN / m. The operating space of this stage node is small, making it impossible to complete the corresponding internal force adjustment operation, which is judged as a matching deviation. According to the correlation, the internal force value of Stage 3 is adjusted from 60 kN / m to 45 kN / m, and the reduced 15 kN / m is allocated to the high-accessibility Stage 1. The internal force value of Stage 1 is adjusted accordingly to 165 kN / m. After verification again, the internal forces of each stage are matched with the spatial accessibility of the corresponding nodes, and the stage internal force distribution is determined to be 165 kN / m for Stage 1, 90 kN / m for Stage 2, and 45 kN / m for Stage 3.

[0094] This eliminates the discrepancy between the theoretical internal force breakdown and the actual construction conditions, ensuring that the internal force distribution at each stage can be controlled based on the spatial accessibility of the corresponding nodes, thus significantly improving the engineering feasibility of the scheme. The corrected stage internal force distribution takes into account both force transmission efficiency, structural safety, and construction conditions, providing a stable and reliable segmented mechanical basis for the subsequent internal force control device layout scheme and timing determination.

[0095] Specifically, determining the layout and timing of the internal force control devices within the feasible region includes: The safety distance is determined based on the measured distance between the spatial coordinates of the rigid obstacle and the path unit corresponding to the target path, and the constraint parameters of the internal force control device are determined based on the gradient ratio of the internal force distribution in each stage. Based on constraint parameters, force transmission sections with a force contribution greater than the preset contribution threshold and a measured distance not less than the safety distance are marked on the target path. The corresponding construction stage is matched according to the accessibility level of the nodes, and the number of nodes is determined according to the number of nodes in the force transmission section to form a layout scheme for the internal force control device. Based on the deployment scheme of the internal force control device, the activation priority of the internal force control device is set according to the accessibility level of the node, and the timing sequence of the internal force control device is determined by taking into account the time required for the connection of the stage internal force distribution.

[0096] The layout of the internal force control device must meet spatial safety requirements to avoid positional interference with rigid obstacles. Simultaneously, the device's operating parameters must match the gradient characteristics of the stage's internal force distribution. A laser rangefinder is used to measure the spatial coordinates of the rigid obstacle and the corresponding path unit of the target path point by point, collecting the straight-line distance data between them. Based on the minimum operating space requirements for indoor structural reinforcement construction, a fixed safety distance is set. This value represents the minimum distance at which the device, after deployment, will not interfere with the obstacle and can be installed and debugged normally. In this project example, the rigid obstacle is a concrete pier and the extension of the wall, and the target path is path 5. The measured straight-line distance between each path unit and the obstacle ranges from 0.15m to 0.5m. In accordance with construction specifications, the safety distance is determined to be 0.3m.

[0097] Extract the gradient ratio of the internal force value of each construction stage to the total target internal force value. The gradient ratio is the ratio of the internal force value of a single stage to the overall target internal force value. Based on the gradient ratio, set appropriate constraint parameters for the corresponding internal force control device. The constraint parameters include the rated bearing capacity, adjustment stroke and installation adaptation dimensions of the internal force control device. A high gradient ratio corresponds to a high bearing capacity device, and a low gradient ratio corresponds to a conventional bearing capacity device.

[0098] For example, if the overall target internal force value is 300 kN / m, the internal force value in stage one is 165 kN / m (gradient ratio 55%), the internal force value in stage two is 90 kN / m (gradient ratio 30%), and the internal force value in stage three is 45 kN / m (gradient ratio 15%), then the constraint parameters are determined as follows: the rated bearing capacity of the device corresponding to stage one is not less than 200 kN / m, and the installation size is adapted to a 0.3m × 0.3m space; the rated bearing capacity of the device corresponding to stage two is not less than 120 kN / m; and the rated bearing capacity of the device corresponding to stage three is not less than 60 kN / m. The installation adaptation dimensions of all devices uniformly meet the space requirements corresponding to the safety clearance.

[0099] This eliminates the risk of interference between the device and obstacles at the spatial level, ensuring the safety of the deployment and control process; by setting constraint parameters in combination with the proportion of internal force gradient in each stage, the working performance of the internal force control device is precisely matched with the internal force control requirements of each stage, avoiding overload or underload of device parameters and improving the effectiveness of internal force control.

[0100] The internal force control device must be deployed only in sections with high force transmission efficiency to ensure the effect of internal force redistribution. Using safety distance and constraint parameters as screening criteria, each force transmission section on the target path is verified one by one. Only sections with a force transmission contribution greater than the preset contribution threshold and a measured distance from rigid obstacles not less than the safety distance are retained. Only high force transmission efficiency sections are retained as the deployment carriers for the device. After section marking is completed, different force transmission sections are matched with corresponding construction stages according to the accessibility level of the nodes: high-accessibility nodes are matched with the first construction stage, medium-accessibility nodes with the second construction stage, and low-accessibility nodes with the third construction stage. When determining the number of devices to be deployed, the number of effective nodes within the force transmission section is used as the basis, with one device deployed for each node. Due to limited operating space in low-accessibility sections, the number of devices can be appropriately reduced while ensuring the force transmission effect.

[0101] For example, the preset force transmission contribution threshold is 0.7. The force transmission contribution of each force transmission section of the target path is between 0.72 and 0.88, which meets the threshold requirement. Moreover, the measured distance between all sections and obstacles is not less than 0.3m, which meets the safety distance condition. In path 5, N1 and N2 are high accessibility nodes, corresponding to the force transmission section of stage one; N3 and N4 are medium accessibility nodes, corresponding to the force transmission section of stage two; N5 and N6 are low accessibility nodes, corresponding to the force transmission section of stage three. The number of units deployed is determined according to the number of nodes. Two units are deployed in stage one, two units in stage two, and one unit is deployed in stage three due to limited operating space. The total number of units deployed is five. Combining the section location, device constraint parameters and stage matching relationship, a deployment scheme for the internal force control device is formed.

[0102] This allows for precise placement of devices, ensuring that devices are deployed only in high-efficiency force transmission areas, reducing redundant deployment costs; matching construction stages according to node accessibility levels, making the deployment plan highly compatible with on-site construction conditions; and determining the number of devices based on the number of nodes, ensuring that the device deployment density matches the force transmission requirements.

[0103] Different accessibility levels correspond to different construction stages. High accessibility nodes have the conditions for priority construction and startup, while low accessibility nodes need to be implemented later. The startup priority is set based on the accessibility level of the node. The higher the level, the higher the startup priority. The device corresponding to the high accessibility node is the first priority and starts first; the device corresponding to the medium accessibility node is the second priority and starts second; the device corresponding to the low accessibility node is the third priority and starts last. The timing sequence needs to be combined with the time required for the connection of the internal force distribution of the stage. This time is the time required for the internal force of the previous stage to reach a stable value and to complete a smooth transition with the internal force of the next stage. It is calculated using finite element simulation. This time is used as the startup interval of adjacent priority devices. All internal force control devices are started in sequence according to priority and startup interval to form the control timing sequence.

[0104] For example, the node accessibility levels, from high to low, correspond to device startup priorities of one, two, and three. Devices in phase one have the highest priority, those in phase two have the second highest priority, and those in phase three have the third highest priority. Simulation calculations show that the time required for the connection of force distribution within each phase is 10 minutes. Based on this, the timing sequence is determined as follows: devices with the highest priority start synchronously; after startup is complete and the devices have been running stably for 10 minutes, devices with the second highest priority start; and after the devices with the second highest priority have been running stably for 10 minutes, devices with the third highest priority start.

[0105] This ensures that the startup sequence of the equipment is consistent with the construction organization logic and adapts to the on-site operating conditions; by combining the timing of the internal force connection in each stage, the sequence is determined to achieve a smooth transition of internal forces in each stage, avoid sudden changes in internal forces caused by synchronous startup or improper intervals of the equipment, ensure the structural stress stability, and accurately control the distribution of internal forces.

[0106] S4. Deploy and drive the internal force control device in stages according to the time sequence, monitor the internal force response parameters of the indoor structure, compare the internal force response parameters with the parameters of the current stage internal force distribution, and adjust the operating parameters of the internal force control device.

[0107] Specifically, the operating parameters of the internal force control device include: The internal force control devices are deployed in stages according to the deployment plan and time sequence, and the internal force control devices corresponding to different construction stages are driven sequentially according to the set start-up priority. During the phased driving process of the internal force regulation device, the internal force response parameters of the indoor structure are continuously monitored, and the deviation ratio between the internal force response parameters and the parameters of the current stage internal force distribution is calculated. Based on the force transmission contribution and deviation ratio of different structural units in the target path, the deviation level is divided, and the adjustment range and adjustment rate of the internal force control device are determined in combination with the time required for the connection of the internal force distribution in each stage. After adjusting the operating parameters of the internal force control device according to the adjustment range and adjustment rate, monitor the internal force response parameters for the preset monitoring time until the deviation ratio meets the preset ratio threshold.

[0108] If synchronous deployment or disordered driving is adopted, it will conflict with the construction space conditions of low-accessibility nodes, and at the same time, it will cause instantaneous and drastic changes in the internal forces of the indoor structure, leading to the risk of structural disturbance. The execution process follows the deployment scheme and sequence formed above. The six nodes of the target path are the deployment objects. The deployment operation is carried out according to the principle of prioritizing high-accessibility nodes and delaying low-accessibility nodes. First, the devices are deployed at the high-accessibility nodes N1 and N2 corresponding to the first construction stage. The control devices are fixed to the node positions by bolt anchoring. The installation dimensions of the devices match the constraint parameters determined in the early stage. After the installation is completed, wiring and debugging are carried out. After confirming that the devices are fault-free, the drive is executed according to the first start priority.

[0109] After the first stage device drive is completed and the internal forces of the structure are initially stabilized, wait 10 minutes for the required time for the connection of the internal force distribution of the stage to ensure that there is no sudden change in the internal forces of the structure during the connection process. Then, deploy and drive the medium accessibility nodes N3 and N4 corresponding to the second construction stage. Continue to wait for 10 minutes for the connection time. Finally, deploy and drive the remaining devices for the low accessibility nodes N5 and N6 corresponding to the third construction stage. All device drive processes adopt the electronic control step-by-step output method to avoid instantaneous loading.

[0110] For example, after the aforementioned calculations, it was found that two devices were deployed in the first phase (including one each of high accessibility nodes N1 and N2), two devices were deployed in the second phase (including one each of medium accessibility nodes N3 and N4), and one device was deployed in the third phase. All five devices were deployed and driven in the above sequence. The distance between the devices and rigid obstacles measured by the laser rangefinder met the safety distance requirement of 0.3m, and there were no installation interference issues.

[0111] This allows for complete adaptation to on-site construction conditions, avoiding conflicts between device installation and obstacles or construction space; prioritizing step-by-step driving avoids sudden changes in structural internal forces, reduces disturbance to the original structure during reinforcement, ensures structural safety, and provides effective data for subsequent deviation calculations and parameter adjustments.

[0112] During the phased driving process of the internal force control device, the actual stress state of the indoor structure will change, and there will inevitably be a deviation between the actual internal force response and the preset stage internal force distribution. During the driving process of all devices, stress sensors are attached to the core stress positions of each structural unit along the target path to continuously acquire the internal force response parameters of the indoor structure. The deviation ratio = |internal force response parameters - current stage internal force distribution parameters| / current stage internal force distribution parameters, so as to intuitively reflect the degree of deviation between the actual internal force and the target internal force.

[0113] For example, in the first construction stage, the internal force distribution parameter is 165 kN / m, and the monitored internal force response parameter is 178 kN / m. The calculated deviation percentage is |178-165| / 165 = 7.88%. Similarly, in the second construction stage, the internal force distribution parameter is 90 kN / m, and the monitored internal force response parameter is 95 kN / m, with a deviation percentage of 5.56%. Similarly, in the third construction stage, the internal force distribution parameter is 45 kN / m, and the monitored internal force response parameter is 48 kN / m, with a deviation percentage of 6.67%. All deviation data are recorded to the control terminal in real time.

[0114] This allows for the acquisition of real internal force response data, ensuring the real-time nature and accuracy of deviation data. A unified standard is used to calculate the deviation ratio, enabling the quantitative expression of internal force deviation, eliminating subjective judgment, and providing an objective basis for subsequent deviation level classification and parameter adjustment, thus avoiding problems such as over-adjustment or ineffective control.

[0115] The force transmission contribution of different structural units on the target path varies, and the impact of the same deviation percentage on the force transmission of the structure is different. At the same time, there is a fixed time requirement for the connection of internal force distribution in each stage. If the deviation level is not classified according to the force transmission contribution and the adjustment parameters are not set according to the connection time, there will be problems such as over-adjustment of low contribution sections and under-adjustment of high contribution sections, or imbalance of internal force connection due to excessively fast adjustment rate. The deviation level is classified according to the force transmission contribution and deviation percentage of different structural units in the target path. The preset contribution threshold is 0.7. The force transmission contribution of all units in this target path is between 0.72 and 0.88, which are all high force transmission contribution sections.

[0116] Based on the requirements for internal force control precision in indoor structural reinforcement and the threshold of structural stress, the deviation level is divided into three levels: a deviation ratio of less than or equal to 10% is a low deviation level, 10% to 20% is a medium deviation level, and greater than 20% is a high deviation level, so as to accurately distinguish the degree of influence of deviation on structural force transmission. The adjustment range and adjustment rate are determined based on the deviation level, while taking into account the time required for the transition of internal force distribution in each stage. The adjustment rate must be controlled to complete the smooth adjustment within the transition time to avoid sudden changes in internal force caused by excessive speed.

[0117] The adjustment range for the low deviation level is matched to the full deviation value, i.e., adjustment range = |actual internal force response parameter - stage internal force distribution parameter|, to ensure accurate offsetting of deviation. The medium and high deviation levels adopt a gradual adjustment range to avoid internal force fluctuations caused by excessive adjustment at one time. The adjustment rate is the internal force deviation value of the stage divided by the time required for the stage internal force distribution to connect, to ensure that the adjustment is completed at a uniform speed within the connection time, so that the internal force transitions smoothly without sudden changes.

[0118] For example, the deviation percentages for the three construction stages are 7.88%, 5.56%, and 6.67%, respectively, all of which are low deviation levels. The adjustment range is set to match the deviation value. Therefore, the adjustment rate for the first stage is 13 / 10 = 1.3 kN / m·min, the adjustment rate for the second stage is 5 / 10 = 0.5 kN / m·min, and the adjustment rate for the third stage is 3 / 10 = 0.3 kN / m·min. All adjustment parameters are adapted to the rated operating range of the device.

[0119] This enables differentiated and precise adjustment, prioritizing the stability of internal forces in sections with high force transmission contribution; the adjustment rate is set in conjunction with the stage internal force connection time to ensure a smooth transition of internal forces in each stage and avoid sudden changes in internal forces and structural disturbances during the adjustment process.

[0120] After the adjustment of the action parameters is completed, the internal forces of the structure will not immediately stabilize to the target state. According to the determined adjustment range and adjustment rate, the action parameters of the internal force control device corresponding to each construction stage are adjusted. The adjustment objects include the working parameters such as the output thrust and prestress value of the device. The adjustment process is carried out at a uniform speed without sudden adjustments. After the adjustment is completed, the verification monitoring process is started. The preset monitoring time is 15 minutes. The internal force response parameters are continuously collected, and the deviation ratio is calculated in real time. The preset ratio threshold is no more than 10%. The adjustment is judged to be up to standard only when the deviation ratio is lower than the preset ratio threshold during the continuous monitoring period.

[0121] For example, after the first stage of device adjustment, the internal force response parameter stabilizes at 166 kN / m during the 15-minute monitoring period, with a deviation rate of 0.61%; after the second stage of adjustment, the internal force response stabilizes at 91 kN / m, with a deviation rate of 1.11%; after the third stage of adjustment, the internal force response stabilizes at 45.5 kN / m, with a deviation rate of 1.11%. The deviation rates of all stages meet the preset threshold requirements, and the adjustment process is completed. If the deviation rate exceeds the threshold, the process will return to re-monitor, recalculate, and adjust the adjustment parameters.

[0122] This ensures that the internal force regulation effect is stable and meets the target, avoiding the problem of internal force rebound after temporary adjustment; the comparison of the percentage threshold ensures the uniformity of internal force regulation quality at each stage, providing a guarantee for the long-term internal force stability of the subsequent structure, so as to avoid the internal force distribution from continuously deviating from the target range and increasing the execution pressure of subsequent correction processes.

[0123] S5. Continuously monitor the internal force distribution of the indoor structure. When the internal force distribution is detected to deviate continuously from the allowable deviation range of the target internal force distribution, it is corrected by adjusting the operating parameters of the internal force control device.

[0124] Specifically, the correction is achieved by adjusting the operating parameters of the internal force control device, including: Continuously monitor the internal force response parameters of the indoor structure, and integrate them to obtain the internal force distribution of the indoor structure; When the internal force distribution deviates from the allowable deviation range of the target internal force distribution in multiple consecutive time windows, it is determined to be a continuous deviation, and the deviation type is classified according to the force transmission contribution of the target path. Based on the accessibility level of the node and the time required for the connection of the force distribution within the stage, trace the continuously deviating force transmission section, and determine the correction parameters for the adjustment amplitude and adjustment rate based on the deviation type and the force transmission section respectively. Adjust the corresponding internal force control device's operating parameters according to the correction parameters until the internal force distribution falls back to the allowable deviation range of the target internal force distribution.

[0125] The internal force response parameters are only instantaneous force data of local measuring points in the structure during the phased control process, and cannot reflect the overall internal force state of the structure. After the structure completes the phased control and enters the normal use state, the internal force response parameters of each measuring point in the indoor structure are continuously monitored. A combination of spatial domain weighted averaging and time domain smoothing filtering is used to calculate the internal force response parameters of all measuring points at the same time according to the force transmission contribution of the corresponding structural unit. That is, the internal force response parameters of each measuring point are first multiplied by the force transmission contribution of the corresponding structural unit, then all the product results are summed, and finally divided by the sum of the force transmission contributions to obtain the weighted average value. At the same time, the instantaneous fluctuation data is removed by time domain smoothing filtering, and abnormal peaks and valleys in a single sampling are filtered out to form the internal force distribution of the indoor structure at that time.

[0126] For example, a total of 6 internal force monitoring points are set up on the wall structure corresponding to the target path. During continuous monitoring, 6 sets of internal force response parameters are acquired every second. First, outliers are removed from each set of parameters, and then the overall internal force distribution value of the structure is obtained after weighted integration. During the monitoring period, the overall internal force distribution initially stabilizes between 295kN / m and 305kN / m. This range is within the allowable deviation range of 300kN / m ± 30kN / m for the target internal force distribution. The allowable deviation range of the target internal force distribution is centered on the target internal force benchmark value of 300kN / m, combined with the structural bearing safety requirements and the allowable range of construction errors, and then fluctuates upward and downward by 30kN / m, forming a deviation range of 300kN / m ± 30kN / m.

[0127] This transforms local, discrete internal force response parameters into overall, continuous internal force distribution results, which can realistically and stably reflect the overall stress state of the structure, avoid misjudgment caused by fluctuations in instantaneous data at a single point, and provide a real and reliable data foundation for subsequent continuous deviation judgment.

[0128] Structural internal forces will experience normal small fluctuations during long-term use. If only a single instance of exceeding the deviation range is used as the correction trigger condition, it will cause unnecessary frequent adjustments. Combining the fluctuation pattern of structural internal forces with long-term monitoring experience, a fixed time window is set, with each time window lasting 5 minutes. Three consecutive time windows are used as the judgment cycle for continuous deviation. This number of cycles can effectively eliminate the interference of instantaneous fluctuations. The average value of the integrated internal force distribution is extracted within each time window. This average value is obtained by summing the internal force distribution values ​​at all sampling times within the window and dividing by the number of samplings. This average value is compared with the calibrated allowable deviation range of the target internal force distribution. If the average value of the internal force distribution in three consecutive time windows exceeds the deviation range, it is judged as a continuous deviation. The deviation type is divided according to the force transmission contribution. The segment with the force transmission contribution greater than the preset contribution threshold is the core force transmission segment, and the continuous deviation in the segment is the core deviation type. The segment with the force transmission contribution not greater than the threshold is the secondary force transmission segment, and the corresponding deviation is the secondary deviation type.

[0129] For example, if the allowable deviation range for the target internal force distribution is 300kN / m ± 30kN / m, and during continuous monitoring, the average internal force distribution values ​​for three consecutive time windows are 342kN / m, 345kN / m, and 348kN / m, respectively, all exceeding the upper limit of deviation of 330kN / m, it is determined to be a continuous deviation. If the force transmission contribution value obtained from the previous topology optimization calculation is retrieved, the force transmission contribution value of each structural unit in the target path is between 0.72 and 0.88, all greater than the preset contribution threshold of 0.7, then this continuous deviation is determined to be a core deviation type.

[0130] This effectively eliminates false triggering caused by instantaneous fluctuations in internal forces, ensuring the rigor of correction initiation conditions; classifying deviation types according to their force transmission contribution allows for differentiation of the degree of influence of deviations on the structural force transmission system, providing a clear classification basis for subsequent accurate source tracing and graded correction.

[0131] Continuous deviation usually corresponds to abnormal force distribution in a specific force transmission section, rather than overall imbalance. First, investigate the force transmission sections corresponding to nodes with low accessibility levels. These sections have limited operational space and are prone to delays in the response of control devices. Verify the time required for the transition of internal force distribution between stages. Based on the preliminary simulation, the smooth transition time of internal forces is determined to be 10 minutes. Determine if the deviation in subsequent sections is caused by incomplete stabilization of internal forces in the previous stage, thus locating the force transmission section with continuous deviation. Correction parameters include adjustment amplitude and adjustment rate. The adjustment amplitude is set according to the type of deviation; core deviation types use a deviation-matching adjustment amplitude, while secondary deviation types use a gradual adjustment amplitude to progressively reduce the deviation. The adjustment rate is determined in conjunction with the time required for the transition of internal force distribution between stages, ensuring that the adjustment process is completed smoothly within the transition time without causing sudden changes in internal forces.

[0132] For example, if the time required for the connection of the internal force distribution in a stage is 10 minutes, and the nodes with low accessibility in the node accessibility level are N5 and N6, by checking the device operation status and internal force data one by one, the force transmission section corresponding to this node is found to be a deviation from the source section. This deviation is a core deviation type. First, calculate the difference between the actual internal force distribution average value and the upper limit of the deviation. It is found that the deviation range exceeds 45kN / m. The adjustment range is set to the full value of the actual deviation range, and the adjustment rate is evenly distributed according to the 10-minute connection time. The adjustment range is determined to be 45kN / m, and the adjustment rate is 4.5kN / m·min. Correction parameters adapted to this deviation section are formed.

[0133] This allows for precise tracing of deviations in the force transmission zone, avoiding blind adjustments across the entire domain and improving the efficiency and targeting of corrections. The correction parameters are set in conjunction with the type of deviation, accessibility conditions, and connection time to ensure a smooth and controllable correction process that will not cause secondary disturbances to the original stress state of the structure.

[0134] The aforementioned steps have completed deviation determination, type classification, segment tracing, and parameter determination. Based on the deviation force transmission segment determined by tracing, the operating parameters of the internal force control device at the corresponding node are adjusted in a directional manner, and the adjustment is carried out uniformly according to the determined adjustment range and rate, without adopting abrupt adjustment methods. The adjustment objects include the device output force and prestress value, and other working parameters. During the adjustment process, the internal force distribution is integrated and updated in real time, and the average value of the internal force distribution is recorded every minute. The average value is obtained by smoothing the sampling data of a short period before and after that moment. The recording continues until the average value of the internal force distribution at multiple consecutive monitoring moments falls within the allowable deviation range of the target internal force distribution, and the correction is determined to be complete.

[0135] For example, the internal force control devices corresponding to nodes N5 and N6 are adjusted according to the corrected parameters. The adjustment process is completed at a constant speed of 4.5 kN / m·min. After adjustment, the internal force distribution is continuously monitored. Through weighted integration calculation, the overall internal force distribution gradually falls back to 310 kN / m, 308 kN / m, and 302 kN / m, all within the allowable deviation range of 300 kN / m ± 30 kN / m.

[0136] This allows for the rapid and accurate restoration of the internal force distribution of the structure to the target state, eliminating the structural stress risks caused by continuous deviations; ensuring that the correction effect is stable and reliable, meeting the stress requirements for long-term use of the structure; and maintaining the stability of the internal force distribution of the structure after correction, thus providing a guarantee for the long-term safe use of the reinforced indoor structure.

Claims

1. A reinforcement method based on the redistribution of internal forces in indoor structures, characterized in that, include: The indoor structure is inspected to identify the spatial constraint boundary formed by external obstacles. The area within the spatial constraint boundary is taken as the feasible region. The target internal force distribution of the indoor structure is determined according to the structural load-bearing performance requirements. Identifying the spatial constraint boundary includes: The system detects the spatial coordinates and component location distribution of the indoor structure, and detects external obstacles within the pre-defined construction influence range at the edge of the indoor structure, identifying the outline, spatial distribution, and fixation properties of the external obstacles. Based on the component location distribution of the indoor structure and the fixed properties of the external obstacles, the constraint levels of the external obstacles are classified, and rigid obstacles with high constraint levels are screened out. Based on the spatial coordinates of the interior structure, and combined with the outline and spatial distribution of rigid obstacles, the spatial constraint boundary formed by the rigid obstacles is delineated; Constrained by the target internal force distribution, a set of force transmission paths is generated within the feasible region through topology optimization. Based on structural perturbation degree, controllability, and spatial accessibility of nodes, a target path is selected from the set of force transmission paths. The generation of the force transmission path set includes: Using the feasible region as a spatial constraint and the target internal force distribution as a mechanical constraint, the area where rigid obstacles are located within the feasible region is set as a path prohibition zone, and the internal force values ​​corresponding to the target internal force distribution are extracted to determine the error limit of internal force transmission. The feasible region is divided into multiple structural units, with the optimization objective being to satisfy the error limits of spatial constraints and internal force transmission, and to avoid entering the path prohibition zone. Based on the optimization objective, the force transmission contribution of different structural units is calculated through topology optimization algorithm, and internal force transmission paths with force transmission contribution greater than the preset contribution threshold are retained. The force transmission path set is generated iteratively. The selected target path includes: The disturbance amplitude of the indoor structure caused by each internal force transmission path in the detection force transmission path set is determined by combining the allowable deviation range of the target internal force distribution. The node layout space and the matching dimensions of the internal force control device for each internal force transmission path are detected to determine the feasibility of control. The minimum distance between different nodes and rigid obstacles on each internal force transmission path is also detected to determine the spatial accessibility of the nodes. The system assesses the suitability of structural disturbance degree, control feasibility, and spatial accessibility of nodes. If all conditions are met, the corresponding internal force transmission path is selected as a candidate path, with priority given to candidate paths whose structural disturbance degree is less than a preset amplitude threshold as the target path. Based on the spatial accessibility of different nodes on the target path, the target internal force distribution is decomposed into stage internal force distributions for different construction stages. Based on the stage internal force distributions and the target path, the layout scheme and timing of the internal force control devices are determined within the feasible region. The decomposition of the stage internal force distributions includes: Based on the spatial accessibility of nodes on the target path and the fixed properties of rigid obstacles, the accessibility level of nodes is divided, and the relationship between accessibility level and internal force transmission is established by combining the force transmission contribution and the internal force value gradient of the target internal force distribution. Based on the correlation, the construction stages are divided according to the accessibility level, and the internal force values ​​of the target internal force distribution are broken down according to the internal force transmission requirements of different construction stages to obtain the initial stage internal force distribution. Verify the matching between the initial stage internal force distribution and the spatial accessibility of nodes in the corresponding construction stage, and determine the stage internal force distribution for different construction stages after correcting the matching deviation. The internal force control device is deployed and driven in stages according to the time sequence to monitor the internal force response parameters of the indoor structure, compare the internal force response parameters with the parameters of the current stage internal force distribution, and adjust the operating parameters of the internal force control device. The internal force distribution of the indoor structure is continuously monitored. When the internal force distribution is found to deviate continuously from the allowable deviation range of the target internal force distribution, the operating parameters of the internal force control device are adjusted to correct it.

2. The reinforcement method based on the redistribution of internal forces in an indoor structure as described in claim 1, characterized in that, Determining the target internal force distribution of the indoor structure includes: The feasible region is defined as the area within the spatial constraint boundary. The actual load-bearing state of the indoor structure is detected based on the spatial range of the feasible region, and the load-bearing internal force threshold of different components is determined according to the requirements of structural load-bearing performance. Based on the spatial distribution of rigid obstacles, the bearing internal force thresholds of different components within the feasible domain are adjusted according to the correlation between component internal forces and deformation, thus forming the initial internal force distribution of the indoor structure within the feasible domain. Verify the spatial adaptability of the theoretical deformation of different components of the indoor structure to the feasible region under the initial internal force distribution. After calibrating the allowable deviation range of the target internal force distribution, determine the target internal force distribution of the indoor structure.

3. The reinforcement method based on the redistribution of internal forces in an indoor structure as described in claim 2, characterized in that, The determination of the layout scheme and timing of the internal force control device within the feasible region includes: The safety distance is determined based on the measured distance between the spatial coordinates of the rigid obstacle and the path unit corresponding to the target path, and the constraint parameters of the internal force control device are determined based on the gradient ratio of the internal force distribution in each stage. Based on constraint parameters, force transmission sections with a force contribution greater than the preset contribution threshold and a measured distance not less than the safety distance are marked on the target path. The corresponding construction stage is matched according to the accessibility level of the nodes, and the number of nodes is determined according to the number of nodes in the force transmission section to form a layout scheme for the internal force control device. Based on the deployment scheme of the internal force control device, the activation priority of the internal force control device is set according to the accessibility level of the node, and the timing sequence of the internal force control device is determined by taking into account the time required for the connection of the stage internal force distribution.

4. The reinforcement method based on the redistribution of internal forces in an indoor structure as described in claim 3, characterized in that, The operating parameters of the internal force regulating device include: The internal force control devices are deployed in stages according to the deployment plan and time sequence, and the internal force control devices corresponding to different construction stages are driven sequentially according to the set start-up priority. During the phased driving process of the internal force regulation device, the internal force response parameters of the indoor structure are continuously monitored, and the deviation ratio between the internal force response parameters and the parameters of the current stage internal force distribution is calculated. Based on the force transmission contribution and deviation ratio of different structural units in the target path, the deviation level is divided, and the adjustment range and adjustment rate of the internal force control device are determined in combination with the time required for the connection of the internal force distribution in each stage. After adjusting the operating parameters of the internal force control device according to the adjustment range and adjustment rate, monitor the internal force response parameters for the preset monitoring time until the deviation ratio meets the preset ratio threshold.

5. The reinforcement method based on the redistribution of internal forces in an indoor structure as described in claim 4, characterized in that, The correction by adjusting the operating parameters of the internal force control device includes: Continuously monitor the internal force response parameters of the indoor structure, and integrate them to obtain the internal force distribution of the indoor structure; When the internal force distribution deviates from the allowable deviation range of the target internal force distribution in multiple consecutive time windows, it is determined to be a continuous deviation, and the deviation type is classified according to the force transmission contribution of the target path. Based on the accessibility level of the node and the time required for the connection of the force distribution within the stage, trace the continuously deviating force transmission section, and determine the correction parameters for the adjustment amplitude and adjustment rate based on the deviation type and the force transmission section respectively. Adjust the corresponding internal force control device's operating parameters according to the correction parameters until the internal force distribution falls back to the allowable deviation range of the target internal force distribution.

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