Urban renewal building reconstruction design scheme matching evaluation method

Abstract

The present application belongs to the technical field of building structure design optimization, and relates to a city renewal building reconstruction design scheme matching evaluation method. The present application objectively identifies weak areas by calculating the bearing capacity margin ratio of the structure unit, and generates a reinforcement scheme along the force transmission path accordingly; the stability of the response difference between schemes is quantified by simulating the staged construction process; then, the multi-index changes such as margin ratio improvement, force transmission continuity and construction disturbance are integrated to construct a comprehensive convergence rate sequence to automatically determine the optimization boundary, and finally the grade is divided according to the arrangement continuity. The problems of weak area identification relying on subjective experience, construction time-varying effect being difficult to quantify and multi-objective decision lacking objective mechanism in the traditional reconstruction scheme evaluation are solved, the bearing capacity state objective partition, construction process safety quantitative evaluation and scheme optimization under multi-index coordination are realized, and the accuracy, safety and engineering applicability of the reconstruction design are improved.

Description

Technical Field

[0001] This invention belongs to the field of building structure design optimization technology, and relates to a matching and evaluation method for urban renewal building renovation design schemes. Background Technology

[0002] With the acceleration of urban renewal, a large number of existing buildings urgently need renovation. In this process, how to ensure structural safety while achieving efficient selection and matching of renovation solutions is a key issue.

[0003] Currently, this process mainly relies on the subjective experience and judgment of designers. Typically, based on simplified calculation models and historical engineering cases, potential weak points in the structure are estimated, and preliminary ideas for reinforcement measures are proposed. The evaluation of the proposed solutions involves a comprehensive weighing of factors such as theoretically calculated safety factors, economic cost estimates, and construction complexity.

[0004] However, such traditional methods have several inherent drawbacks. First, due to the lack of systematic analysis based on the actual stress state of the overall structure, the identification of key areas with insufficient load-bearing capacity may not be accurate enough, which leads to a lack of unified and objective quantitative benchmarks for the subsequent generation and evaluation of targeted reinforcement schemes.

[0005] Secondly, existing methods struggle to accurately quantify and assess the time-varying effects of construction loading. Renovation projects often involve the phased application of new loads and the sequential strengthening of components. Static or isolated model analysis methods cannot fully simulate the cumulative response of existing structural systems to phased loading, resulting in a lack of critical considerations for the safety of the construction process in the scheme evaluation system, thus compromising the reliability of the evaluation conclusions.

[0006] Finally, when alternative modification designs are generated, the existing technology lacks an objective and reproducible quantitative ranking and decision-making mechanism that can comprehensively measure their performance under multiple objectives. As a result, the selection of the best modification option remains at the level of qualitative comparison and cannot automatically and efficiently match the comprehensive optimal solution. Summary of the Invention

[0007] In view of this, in order to solve the problems mentioned in the background technology, a matching evaluation method for urban renewal building renovation design schemes is proposed.

[0008] The objective of this invention can be achieved through the following technical solution: a matching and evaluation method for urban renewal building renovation design schemes, comprising: calculating the margin ratio of each unit in the space of the remaining bearing capacity and the new load based on the output of the structural model of the building to be renovated, and dividing the bearing capacity tension and relaxation zones according to their neighborhood differences.

[0009] Based on the segment distribution, a reinforcement component layout scheme is generated along the structural force transmission path, and the layout continuity of each scheme is calculated. The scheme is then screened by combining the margin ratio neighborhood dispersion and the layout continuity to form a set of feasible structural schemes.

[0010] The simulation method simulates the phased application process of new loads during the construction of each feasible structural scheme and calculates the response disturbance degree. Based on the synergistic relationship between its gradient characteristics and the number of reusable reinforced components, the schemes are ranked and the optimal scheme sequence is output.

[0011] The cumulative values ​​of the margin ratio improvement, the change in layout continuity, and the change in response disturbance degree in the preferred scheme sequence are calculated to generate a comprehensive convergence rate sequence. The first reversal point of the change direction of this sequence is identified, and all schemes before this point are included in the recommended scheme set.

[0012] Based on the continuity of the arrangement of the reinforced components along the force transmission path, the recommended scheme set is classified into levels.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention solves the problem that the traditional method relies on subjective experience and lacks spatial distribution quantitative basis for identifying weak areas of the structure by calculating the margin ratio of each unit of the building space grid and dynamically dividing the bearing capacity tension and relaxation sections based on the median of the neighborhood difference sequence. It realizes the objective partitioning and positioning of the bearing capacity state, provides a unified spatial constraint benchmark for subsequent reinforcement design, and improves the accuracy of weak area identification and the pertinence of reinforcement resource allocation.

[0014] (2) This invention solves the problem that static analysis cannot reflect the time-varying effects of construction and lacks process safety assessment by simulating the application of new loads in stages according to construction process nodes and calculating the response disturbance degree of adjacent schemes. It quantifies the stability characteristics of the differences in construction adaptability between schemes, enables the evaluation system to capture the cumulative effect of structural response caused by step loading, effectively identify schemes with high construction risks, and enhances the safety and controllability of the transformation process.

[0015] (3) This invention generates a comprehensive convergence rate sequence by normalizing and accumulating the margin ratio improvement, the continuous change in the layout and the change in the response disturbance, and identifies the optimization boundary based on the sign reversal point of the change. This reduces the problem of the scheme selection relying on qualitative trade-offs and lacking an objective decision-making mechanism, realizes the determination of the convergence boundary under the synergy of multiple indicators, avoids subjective weight setting, and enables the recommended scheme set to cover the effective range of comprehensive performance improvement, thereby improving the objectivity and engineering applicability of scheme selection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart illustrating the steps of a method for matching and evaluating urban renewal building renovation design schemes in this invention.

[0018] Figure 2 This is a flowchart illustrating the specific method for dividing the bearing capacity into tense and relaxed zones in this invention.

[0019] Figure 3 This is a flowchart of the method for obtaining the preferred solution sequence in this invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] The following description, in conjunction with the accompanying drawings, details the specific scheme of the urban renewal building renovation design scheme matching and evaluation method provided by this invention.

[0023] Please see Figure 1 As shown, the present invention provides a matching evaluation method for urban renewal building renovation design schemes, including: S1, based on the margin ratio of the remaining bearing capacity output by the structural model of the building to be renovated to the margin ratio of each unit in the calculation space of the new load, and dividing the bearing capacity tension and relaxation zones according to their neighborhood differences.

[0024] During urban renewal and renovation, the load-bearing capacity of existing buildings is unevenly distributed in space due to factors such as construction age, material aging, and usage history. New functional loads may cause stress concentration in local areas. If reinforcement design is based solely on the global average load-bearing capacity, it may lead to an imbalance in resource allocation or local safety hazards.

[0025] Therefore, it is necessary to identify the distribution boundaries of the bearing capacity tension and relaxation zones through spatial grid analysis, so as to provide a spatial positioning basis for subsequent targeted reinforcement.

[0026] Please see Figure 2 As shown, in one specific embodiment, the remaining bearing capacity output by the structural model of the building to be modified and the equivalent axial force generated by the new load in the unit are obtained, and the ratio of the two is calculated to generate the margin ratio of each unit of the building space grid. The margin ratio represents the bearing capacity reserve state of the building space unit under the action of the new load. Its value reflects the relative sufficiency of the remaining bearing capacity of the unit relative to the demand of the new load, and provides a quantitative basis for the subsequent division of the bearing capacity tension and relaxation sections.

[0027] The process of obtaining the remaining bearing capacity includes: extracting the geometric section parameters of the structural unit based on the building as-built drawings, combining them with the material strength degradation parameters obtained from on-site testing, inputting them into the structural calculation model, and outputting the remaining bearing capacity of the unit under axial load.

[0028] The structural calculation model is a finite element model constructed based on the geometric information of the as-built drawings and the material parameters detected on site.

[0029] The process of obtaining the equivalent axial force includes: decomposing the new load corresponding to the renovation requirements into surface load and line load components according to functional type, and applying them in combination to the structural finite element model for static analysis, extracting the axial internal force component of the unit as the equivalent axial force. The static analysis is a conventional calculation process based on the finite element method to solve the equilibrium equations of the structure under static loads to obtain the axial internal force response values ​​of each unit.

[0030] For each cell in the building space grid, calculate the set of absolute values ​​of the difference between the margin ratio of the cell and the margin ratio of its neighboring cells, and calculate the standard deviation of the set as the neighborhood dissimilarity of the cell.

[0031] The neighboring unit refers to an adjacent unit in the building space grid that has a direct mechanical connection with the current unit.

[0032] The neighborhood dissimilarity of all units is collected to form a neighborhood dissimilarity sequence, and the median of this sequence is determined as the dissimilarity boundary benchmark.

[0033] Since neighborhood dissimilarity can characterize the degree of abrupt change in the bearing capacity of a unit and its surrounding environment, a higher dissimilarity indicates a more discontinuous distribution of bearing capacity in the area and a greater likelihood of local weaknesses. Therefore, continuous areas with neighborhood dissimilarity higher than the dissimilarity boundary benchmark are classified as bearing capacity tension zones, while the remaining areas are classified as bearing capacity relaxation zones.

[0034] S2. Based on the segment distribution, generate reinforcement component layout schemes along the structural force transmission path, calculate the layout continuity of each scheme, and combine the margin ratio neighborhood dispersion and layout continuity to screen the schemes and form a set of feasible structural schemes.

[0035] Considering that isolated reinforcement components would be difficult to form an effective force transmission system, leading to interruption of the load transfer path and weakening the overall structural performance; and that a highly discrete spatial distribution of the margin ratio indicates uneven reinforcement effect, which may cause new stress concentration, it is necessary to continuously arrange reinforcement components along the structural force transmission path in the load-bearing capacity-tight section. Feasible schemes should be screened through dual constraints of arrangement continuity and spatial uniformity of margin ratio to ensure that the scheme satisfies both the integrity of the force transmission path and avoids abrupt spatial changes in the reinforcement effect.

[0036] In one specific embodiment, the axial force streamlines of the main load-bearing components are extracted through a structural calculation model, and the sequence of components with continuously distributed axial force values ​​during the load transfer from top to bottom is identified as the spatial orientation of the structural force transmission path.

[0037] The axial force streamlines are statically analyzed under standard constant load conditions using a structural finite element model, outputting the axial force numerical distribution of each load-bearing component. Along the vertical load transfer direction, load-bearing components with non-zero axial force values ​​and continuous spatial positions are connected sequentially to form a sequence of axial force streamlines that characterize the main load transfer channels. The spatial projection of this sequence is the structural force transmission path.

[0038] Along the force transmission path, in the section with tense bearing capacity, the reinforcement priority is determined by sorting the margin ratio of each unit from small to large. Reinforcement components are inserted in sequence, and the spatial distance between adjacent components in the direction of the force transmission path is checked in real time to ensure that the spatial distance between adjacent components meets the minimum spacing requirement for effective force transmission, so that adjacent components form a continuous force transmission chain. The output includes the spatial coordinates of each reinforcement component and the connection relationship between the components.

[0039] The minimum spacing requirement is determined based on the provisions of the structural design code regarding the effective anchorage length of reinforced components.

[0040] For each layout scheme, the ratio of the number of continuously connected reinforced component segments along the force transmission path to the total number of reinforced components in the scheme is used as the layout continuity; if the total number of reinforced components in the scheme is zero, the layout continuity is assigned a value of zero.

[0041] The standard deviation of the difference sequence between adjacent elements in the spatial grid is calculated as the neighborhood dispersion. Since the neighborhood dispersion reflects the uniformity of the spatial distribution of the structural bearing capacity after the implementation of the scheme, the layout continuity characterizes the ability of the reinforced components to form an effective force transmission system.

[0042] When the neighborhood dispersion is high, it indicates that the spatial fluctuation of the load-bearing capacity improvement effect is significant. In this case, it is necessary to compensate for the high layout continuity in order to maintain the overall structural collaborative working ability. Conversely, when the neighborhood dispersion is low, the load-bearing capacity distribution is relatively uniform, and the requirement for layout continuity can be appropriately relaxed. Therefore, after arranging the neighborhood dispersion of all schemes in ascending order of values, the median of the sequence is taken as the dispersion boundary point.

[0043] When the neighborhood dispersion of a scheme is greater than the boundary point, it indicates that the spatial distribution of the margin ratio after reinforcement is more uneven than the average level of the scheme set, and there is a risk of sudden change in local bearing capacity. Schemes with a layout continuity greater than the quartile of the layout continuity sequence are selected and retained to ensure that the structural risks caused by uneven distribution are compensated by a high continuity force transmission chain.

[0044] When the neighborhood dispersion is less than or equal to the boundary point, it indicates that the spatial distribution of the margin ratio of the scheme is relatively uniform and the effect of improving the bearing capacity is gradual. Schemes with a layout continuity greater than the quartile of the layout continuity sequence are selected and retained. Finally, the set of selected schemes constitutes the set of structurally feasible schemes.

[0045] S3. Simulate the phased application process of new loads during the construction of each feasible structural scheme set, calculate the response disturbance degree, and sort the schemes according to their gradient characteristics and the synergistic relationship with the number of reusable reinforced components, outputting the optimal scheme sequence.

[0046] Considering that the new loads during urban renewal and renovation cannot be applied all at once, they must be implemented in stages according to the logical nodes of foundation reinforcement, main structure renovation, and functional space adjustment based on the actual construction procedures. If the performance of the scheme is evaluated only based on the final load state, the structural safety and deformation control risks in the intermediate construction state will be ignored.

[0047] Meanwhile, different reinforcement schemes may cause significant differences in the response of key structural components at the same construction stage. The degree of fluctuation of this difference directly reflects the scheme's adaptability to construction disturbances. In addition, whether existing reinforcement components can be effectively reused in subsequent modification cycles is related to resource recycling efficiency and project economy.

[0048] Therefore, the stability of the response differences of adjacent schemes at each construction stage is quantified by dynamic simulation of the construction process, and an adaptive ranking strategy is implemented based on the synergistic relationship between this stability characteristic and the potential for resource reuse.

[0049] In one specific embodiment, for each scheme in the set of feasible structural schemes, the new load is divided into multiple application stages based on the actual process nodes of the building renovation construction. Specifically, the three process nodes of foundation reinforcement completion, main structure reinforcement and renovation completion, and internal functional space adjustment completion are used as the basis for stage division. The new loads introduced by the corresponding process are respectively assigned to the first application stage, the second application stage, and the third application stage, forming a load application sequence that matches the actual construction process.

[0050] Based on the structural calculation model, a phased static analysis is performed on each scheme. Specifically, the new load corresponding to the first application stage is applied to the existing structural model, and static analysis is performed to obtain the structural displacement field and record the response values ​​of key stress parts.

[0051] Then, the new load in the second application stage is superimposed on the load in the first stage, and static analysis is performed again and the response value is recorded; finally, the new load in the third application stage is superimposed on the sum of the loads in the first two stages, static analysis is performed and the response value is recorded.

[0052] Through the above-described process of progressively accumulating and solving loads, the response time sequence, which characterizes the structural deformation evolution throughout the entire construction process, is obtained.

[0053] For any two adjacent schemes in the set of feasible structural schemes, calculate the absolute value of the difference in displacement response values ​​at the same application stage, and form a sequence of absolute difference values. This sequence reflects the degree of dispersion of the structural response of the two schemes under the same construction conditions.

[0054] The standard deviation of the absolute value sequence of differences is calculated as the response perturbation degree. The above calculation is performed on all adjacent pairs of structurally feasible solutions in the set of feasible solutions to generate a response perturbation degree sequence corresponding to the solution order.

[0055] Please see Figure 3 As shown, the method for obtaining the preferred scheme sequence is as follows: the arithmetic mean of the absolute values ​​of the differences between adjacent elements in the response perturbation degree sequence is taken as the gradient feature of the sequence, and the gradient feature characterizes the smoothness of the change of response perturbation degree along the scheme sequence.

[0056] The number of components in each scheme that met the strength and deformation limits after damage testing after the removal of the reinforced components was counted was taken as the number of reusable components.

[0057] The damage detection is performed based on on-site measured data of the width of surface cracks, depth of concrete carbonation, and corrosion rate of steel bars. The strength limit is determined according to the safe service strength standard for the corresponding component type in the current structural reinforcement design code, and the deformation limit is determined according to the allowable deflection or lateral displacement limit for the corresponding component type in the code. Reinforced components that meet the above two limit requirements are included in the reusable quantity, which represents the recycling potential of reinforcement resources after the implementation of the scheme.

[0058] When the gradient characteristic is less than or equal to the median of the gradient characteristics of all feasible structural schemes, it indicates that the change in the response disturbance degree sequence is gradual and the differences in construction adaptability between schemes are stable and controllable. At this time, construction safety becomes the dominant decision factor, and the schemes are arranged in ascending order of response disturbance degree. Conversely, when the gradient characteristic is greater than the median, it indicates that the fluctuation in the response disturbance degree sequence is violent and the differences in construction adaptability between schemes are unstable. In this case, the schemes are arranged in descending order of reusable quantity, and the output of the sorted scheme sequence is the preferred scheme sequence.

[0059] S4. Calculate the cumulative values ​​of the margin ratio improvement, layout continuity change, and response disturbance change in the preferred scheme sequence to generate a comprehensive convergence rate sequence. Identify the first reversal point of the change direction of this sequence and include all schemes before this point into the recommended scheme set.

[0060] Considering that ranking based on a single indicator is difficult to fully reflect the synergistic evolution of multiple dimensions of performance such as structural safety, force transmission continuity and construction adaptability during the optimization process, and that simple weighted fusion of multiple indicators is prone to introducing subjective weight bias.

[0061] Therefore, after eliminating dimensional differences through normalization, the results are accumulated to form a sequence that reflects the convergence trend of the overall performance. The optimization boundary is then identified based on the inflection point of the sequence's change direction to obtain a set of recommended solutions.

[0062] In one specific embodiment, for two adjacent schemes in the preferred scheme sequence, the margin ratio improvement of the latter scheme relative to the former scheme, the change in layout continuity, and the change in response disturbance degree are calculated respectively.

[0063] The improvement in the average margin ratio is obtained by calculating the difference between the arithmetic mean of the margin ratios of adjacent schemes; the change in layout continuity is obtained by calculating the difference in the layout continuity values ​​of adjacent schemes; and the change in response disturbance degree is obtained by calculating the difference in the response disturbance degree values ​​of adjacent schemes.

[0064] The margin ratio improvement, layout continuity change, and response disturbance change of all adjacent scheme pairs in the preferred scheme sequence are statistically analyzed to obtain three sets of change sequences. The difference between the maximum and minimum values ​​of each set is taken as the range.

[0065] The average improvement of the margin ratio and the change in layout continuity of adjacent scheme pairs are normalized by dividing them by the range of their respective sequences; the change in response disturbance degree is normalized by dividing it by the range of its sequence and taking the negative value to unify the direction; then, the three normalized indices are added together to obtain the comprehensive change of the adjacent scheme pair.

[0066] Starting from the beginning of the preferred scheme sequence, the comprehensive change of each adjacent scheme pair is accumulated to generate a cumulative change sequence. The size relationship between adjacent elements in the cumulative change sequence is compared: when the latter term is greater than the former term, a positive value is output, and when the latter term is less than or equal to the former term, a negative value is output, forming a comprehensive convergence rate sequence.

[0067] The difference between adjacent elements in the overall convergence rate sequence is calculated to form a convergence rate change sequence. This convergence rate change sequence characterizes the rate of change of the overall convergence rate along the scheme sequence, and its numerical sign reflects the acceleration or deceleration characteristics of the overall performance improvement trend.

[0068] When traversing the sequence of convergence rate changes, the first sign reversal position where the positive sign turns negative indicates that the overall performance improvement trend has changed from accelerated growth to decelerated growth or has begun to decline. In other words, the optimization process has reached the inflection point of marginal benefit, and the overall performance improvement brought about by further increasing the complexity of the scheme has significantly weakened or even regressed. Therefore, the scheme number corresponding to this position is reduced by one to determine the recommended boundary number. All schemes with numbers less than or equal to the recommended boundary number in the preferred scheme sequence are extracted to form the recommended scheme set.

[0069] If no sign reversal occurs in the sequence, it indicates that the overall performance improvement trend remains accelerated or stable within the entire preferred solution sequence, and there is no diminishing marginal returns. In other words, all solutions make a positive cumulative contribution to the overall performance. Therefore, all solutions in the preferred solution sequence are included in the recommended solution set.

[0070] S5. Based on the continuity of the arrangement of the reinforced components along the force transmission path, the recommended scheme set is classified into levels.

[0071] Considering the varying requirements for structural force transmission continuity across different renovation projects, high-continuity solutions are suitable for scenarios with stringent requirements for structural integrity, while medium-to-low-continuity solutions can meet general renovation needs and offer greater ease of construction. Therefore, the recommended solutions are categorized based on layout continuity to provide a matching selection basis for solutions with different technical requirements.

[0072] In one specific embodiment, the layout continuity of each scheme in the recommended scheme set is calculated, and the layout continuity values ​​are arranged in ascending order. The schemes are divided into three segments using the lower third and upper third as the dividing points: the first segment contains schemes with layout continuity less than the lower third, the second segment contains schemes with layout continuity between the lower third and upper third, and the third segment contains schemes with layout continuity greater than the upper third.

[0073] In summary, this invention first calculates the margin ratio of each spatial unit based on the structural model of the building to be modified, and divides the bearing capacity tension zone and relaxation zone according to the degree of difference in their neighborhoods. Second, it generates a reinforcement component layout scheme in the tension zone along the structural force transmission path, and forms a set of feasible structural schemes based on the collaborative screening rules of layout continuity and neighborhood dispersion of margin ratio. Subsequently, it simulates the phased application process of new loads during the construction of each scheme, calculates the response disturbance degree, and combines the gradient characteristics of its sequence with the number of reusable reinforcement components to collaboratively rank the schemes and output the preferred scheme sequence.

[0074] Furthermore, the normalized cumulative values ​​of the margin ratio improvement, layout continuity change, and response disturbance degree change in the sequence are calculated to generate a comprehensive convergence rate sequence. The recommended scheme set is determined by identifying the first reversal point of its change direction. Finally, the recommended set is classified according to the layout continuity, thereby completing the whole-chain adaptive scheme matching decision from structural safety analysis, scheme generation and screening, construction process simulation to comprehensive convergence evaluation and final graded recommendation.

[0075] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, in the form of a computer program product.

[0076] Those skilled in the art will recognize that the algorithmic steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this application.

[0077] In addition, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0078] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0079] Finally, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for matching and evaluating urban renewal building renovation design schemes, characterized in that, include: Based on the remaining bearing capacity output from the structural model of the building to be modified and the margin ratio of each unit in the calculation space of the new load, the bearing capacity tension and relaxation zones are divided according to their neighborhood differences. The margin ratio of each unit is generated by calculating the ratio of the remaining bearing capacity output from the structural model of the building to be modified and the equivalent axial force generated by the new load in the unit. For each cell in the building space grid, calculate the set of absolute values ​​of the difference between the margin ratio of the cell and the margin ratio of its neighboring cells, and calculate the standard deviation of the set as the neighborhood variability of the cell. Based on the segment distribution, a reinforcement component arrangement scheme is generated along the structural force transmission path, and the arrangement continuity of each scheme is calculated. The scheme is screened by combining the margin ratio neighborhood dispersion and the arrangement continuity to form a set of feasible structural schemes. The neighborhood dispersion is obtained by calculating the standard deviation of the margin ratio in the sequence of differences between adjacent cells in the spatial grid; The simulation method simulates the phased application process of new loads during the construction of each feasible structural scheme and calculates the response disturbance degree. Based on the synergistic relationship between its gradient characteristics and the number of reusable reinforced components, the schemes are ranked and the optimal scheme sequence is output. The specific method for calculating the response perturbation degree is as follows: For each of the structurally feasible solutions, the new load is divided into multiple application stages based on the actual construction process nodes of the building renovation. Based on the structural calculation model, the process of adding loads to the existing structure under each application stage is simulated, and the displacement response values ​​of the key stress parts of the structure at the end of each stage are recorded to form the response time sequence corresponding to the scheme. For any two adjacent schemes in the set of feasible structural schemes, calculate the absolute value of the difference in displacement response values ​​during the same application stage, form a sequence of absolute difference values, and calculate its standard deviation as the response perturbation degree of the adjacent scheme pair. Perform the above calculations on all adjacent pairs of structurally feasible solutions in the set of feasible solutions to generate the response perturbation degree for each solution. The cumulative values ​​of the margin ratio improvement, the change in layout continuity, and the change in response disturbance degree in the preferred scheme sequence are calculated to generate a comprehensive convergence rate sequence. The first reversal point of the change direction of this sequence is identified, and all schemes before this point are included in the recommended scheme set. The method for obtaining the comprehensive convergence rate sequence is as follows: For two adjacent schemes in the preferred scheme sequence, calculate the average improvement of the margin ratio, the change in layout continuity, and the change in response disturbance degree of the latter scheme relative to the former scheme. The average improvement of the margin ratio, the change in layout continuity, and the change in response disturbance degree of all adjacent scheme pairs in the preferred scheme sequence were statistically analyzed to obtain three sets of change sequences; The difference between the maximum and minimum values ​​in each set of change sequences is taken as the range of that set. Normalization is achieved by dividing the mean improvement of the margin ratio and the change in layout continuity of adjacent scheme pairs by the range of their respective sequences. The change in response perturbation is divided by its sequence range and the negative value is taken to complete normalization and direction unification. Then, the three normalization indices are added together to obtain the comprehensive change of the adjacent scheme pair. Starting from the beginning of the preferred scheme sequence, the combined change of each adjacent scheme pair is accumulated sequentially to generate a cumulative change sequence. The magnitude relationship of adjacent elements in the sequence is compared, and the overall convergence rate sequence is output. Based on the continuity of the arrangement of the reinforced components along the force transmission path, the recommended scheme set is classified into levels.

2. The method for matching and evaluating urban renewal building renovation design schemes as described in claim 1, characterized in that, The specific method for dividing the bearing capacity tension and relaxation zones is as follows: The neighborhood dissimilarity of all units is collected to form a neighborhood dissimilarity sequence, and the median of this sequence is determined as the dissimilarity boundary benchmark. Continuous areas with a neighborhood difference degree higher than the difference degree boundary benchmark are classified as bearing capacity tension zones, and the remaining areas are classified as bearing capacity relaxation zones.

3. The method for matching and evaluating urban renewal building renovation design schemes as described in claim 1, characterized in that, The method for generating the reinforcement component layout scheme is as follows: Using the spatial distribution and margin ratio distribution of the load-bearing capacity tension zone as input, the spatial orientation of the structural force transmission path is identified based on the component axial force transmission path output by the structural calculation model. Along the structural force transmission path, reinforcement components are arranged sequentially in the load-bearing capacity tension zone in order of increasing margin ratio; Constrain the spatial distance between adjacent reinforced components in the force transmission path direction to meet the minimum spacing requirement for effective force transmission of the components, so that adjacent components form a continuous force transmission chain, and output an arrangement scheme that includes the spatial coordinates of each reinforced component and the connection relationship between the components.

4. The method for matching and evaluating urban renewal building renovation design schemes as described in claim 1, characterized in that, The method for generating the set of feasible structural solutions is as follows: For each reinforcement component layout scheme, the ratio of the number of continuously connected reinforcement component segments along the structural force transmission path to the total number of reinforcement components in the scheme is used as the layout continuity. Sort the neighborhood dispersion of all schemes in ascending order of numerical value, and take the median of the sequence as the dispersion boundary point; When the neighborhood dispersion of a scheme is greater than the dispersion threshold, schemes with a layout continuity greater than the quartile of the layout continuity sequence are selected and retained. Conversely, schemes with a layout continuity greater than the quartile of the layout continuity sequence are retained, and the filtered scheme set is output, forming the structurally feasible scheme set.

5. The method for matching and evaluating urban renewal building renovation design schemes as described in claim 1, characterized in that, The method for obtaining the preferred scheme sequence is as follows: The response perturbation degrees of each scheme in the set of structurally feasible schemes are arranged in the order of the schemes to form a response perturbation degree sequence. The mean of the absolute values ​​of the differences between adjacent elements in the response perturbation degree sequence is calculated as the gradient feature of the sequence. The number of components that meet the conditions for reuse after the reinforcement components are removed in each scheme is counted as the number of reusable components; When the gradient feature is less than or equal to the median of the gradient features of all structurally feasible solutions, the solutions are arranged in ascending order of response perturbation degree; otherwise, the solutions are arranged in descending order of reusability quantity, and the sorted solution sequence is output as the preferred solution sequence.

6. The method for matching and evaluating urban renewal building renovation design schemes as described in claim 1, characterized in that, The calculation of the average improvement in margin ratio, the change in layout continuity, and the change in response disturbance degree of the latter scheme relative to the former scheme is specifically as follows: The improvement in the average margin ratio is obtained by calculating the difference between the arithmetic mean of the margin ratios of adjacent schemes; The change in continuity is obtained by the difference in continuity values ​​between adjacent schemes; The change in response perturbation degree is obtained by the difference in response perturbation degree values ​​between adjacent schemes.

7. The method for matching and evaluating urban renewal building renovation design schemes as described in claim 1, characterized in that, The method for obtaining the recommended solution set is as follows: Calculate the difference between adjacent elements in the convergence rate sequence to form a convergence rate change sequence; Traverse the sequence of convergence rate changes, identify the first sign reversal position where the sign changes from positive to negative, subtract one from the corresponding scheme number to determine the recommended boundary number, and extract all schemes in the preferred scheme sequence whose numbers are less than or equal to the recommended boundary number to form the recommended scheme set; If no sign reversal occurs in the sequence, then all schemes in the preferred scheme sequence will be included in the recommended scheme set.

8. The method for matching and evaluating urban renewal building renovation design schemes as described in claim 1, characterized in that, Based on the continuity of the arrangement of the reinforced components along the force transmission path, the recommended scheme set is classified into levels, specifically as follows: Calculate the layout continuity of each scheme in the recommended scheme set, and sort the layout continuity values ​​in ascending order; Using the lower and upper tertiaries as dividing points, the scheme is divided into three segments; The first section contains schemes with a layout continuity less than the lower third, the second section contains schemes with a layout continuity between the lower and upper thirds, and the third section contains schemes with a layout continuity greater than the upper third.

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