Reduced scale model test method for cable-supported grid roof

Abstract

The invention discloses a reduced scale model test method for a cable-supported grid roof, which can accurately simulate the structural characteristics of the cable-supported grid roof, including the stress state, deformation condition and the like, through a three-dimensional finite element model established by finite element analysis software, and provides a theoretical basis for the design of a reduced scale model. Through the determined similarity ratio and finished product steel strength, the reduced scale model accurately reflects the mechanical behavior of the original structure, so that the accuracy and effectiveness of the test are improved on the premise of ensuring the test safety, and the change of the cable force of the inhaul cable can be monitored in real time by arranging the fiber grating self-sensing steel strand on the inhaul cable of the reduced scale model. By means of high precision, high sensitivity and long-term stability, the stress change is captured and fed back in time, the test is assisted to be carried out smoothly, the cost of the reduced scale model test is reduced, the accuracy is kept, the stress states under different working conditions are simulated, and a basis is provided for optimization design.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, and in particular to a scaled model test method for a cable-supported grid roof. Background Art

[0002] Large cable-supported grid roof structures are widely used in large buildings. They bear external loads through the combined action of cables and grids. This structure has the advantages of large span, light weight, and beautiful appearance. However, it also brings many challenges in design and construction. Especially in large-span structures, the relaxation, deformation, and tension changes of cables may lead to a decrease in the bearing capacity or instability of the structure, which not only increases the construction cost, but also affects the shortening of the construction period and the improvement of efficiency. In the design process of large cable-supported grid roofs, scaled model tests are an important means to verify the structural performance. However, the existing scaled model tests face many technical difficulties in simulating actual construction conditions: (1) Material strength similarity: Since large cable-supported grid roofs usually use high-strength steel, such as Q460 or Q355, these materials are difficult to directly apply in scaled models because the scaled model rods are small in size and difficult to obtain on the market. Finding matching thin-gauge high-strength steel leads to significant differences in material strength between the scaled model and the actual project, affecting the accuracy of the test results. (2) Structural force equivalence: The scaled model needs to meet the principles of geometric similarity, mechanical similarity and material similarity. However, in actual operation, due to differences in material strength and limitations in scale ratio, it is difficult to achieve complete equivalence of structural force. This may lead to deviations between the stress state of the scaled model during the test and the actual project, thus failing to accurately reflect the performance of the actual structure. (3) Real-time monitoring of cable force changes: In large cable-supported grid roofs, the stress state of the cable is crucial to the stability of the entire structure. However, existing monitoring technologies make it difficult to achieve real-time monitoring of cable force changes in scaled model tests, which leads to the inability to timely discover and solve cable relaxation, deformation and other problems during the test, thus affecting the reliability and accuracy of the test results. Summary of the invention

[0003] In view of this, the present invention proposes a scaled model test method for cable-supported grid roof, which can solve the defects of the prior art, such as low accuracy of test results, inability to accurately reflect actual structural performance and inability to achieve real-time monitoring of cable force changes.

[0004] The technical solution of the present invention is achieved in this way:

[0005] A scaled model test method for a cable-supported grid roof, specifically comprising:

[0006] According to the structure of the cable-supported grid roof, a three-dimensional finite element model is established using finite element analysis software;

[0007] According to the project requirements, determine the similarity ratio of the three-dimensional finite element model and the strength of the finished steel to obtain a scaled model;

[0008] Arrange the fiber Bragg grating self-sensing steel strands on the cables of the scaled model;

[0009] In the construction process simulation, the fiber grating self-sensing steel strands are used to monitor the cable force changes of the scaled model in real time, thereby realizing the scaled model test of the cable-supported grid roof.

[0010] As a further optional scheme for the scaled model test method for the cable-supported grid roof, the similarity ratio of the three-dimensional finite element model and the strength of the finished steel are determined according to the project requirements to obtain the scaled model, which specifically includes:

[0011] According to the structural characteristics and test budget of the specific project, the similarity ratio of the three-dimensional finite element model is determined to obtain the initial scaled model;

[0012] The finished steel strength of the initial scaled model is designed by using the cross-section equivalent treatment method, the high-strength steel method, or the frame number reduction method to obtain the final scaled model.

[0013] As a further optional solution of the scaled model test method for the cable-supported grid roof, the arrangement of the fiber Bragg grating self-sensing steel strands on the cables of the scaled model specifically includes:

[0014] Arrange fiber Bragg grating self-sensing steel strands on the annular cables, radial cables and lower cables of the scaled model. The fiber Bragg grating self-sensing steel strands are twisted together by a number of high-strength steel wires, and the fiber Bragg grating composite sensing tendons are embedded in the core steel wire grooves of the steel strands.

[0015] Connect the fiber Bragg grating composite sensor tendons through signal acquisition equipment, and perform initial data acquisition under unloaded static conditions to record the reference cable force values ​​of the annular cables, radial cables and lower cables under stress-free conditions;

[0016] After the initial data collection is completed, the stress conditions of the annular cables, radial cables and lower cables are monitored in real time.

[0017] As a further optional scheme of the scaled model test method for the cable-supported grid roof, the fiber optic Bragg grating sensing tendon is provided with at least one measuring point at a different position of each cable, and the grating area length of the measuring point is 5 mm to 20 mm.

[0018] As a further optional scheme of the scaled model test method for the cable-supported grid roof, in the construction process simulation, the cable force change of the scaled model cable is monitored in real time based on the fiber Bragg grating self-sensing steel strand, specifically including:

[0019] The circumferential and radial cables are laid on the base of the scaled model according to the design requirements, and the fiber grating self-sensing steel strands monitor the cable tension in the initial laying state in real time;

[0020] After the laying of the circumferential cables and radial cables is completed, one end of the radial cables is connected to the main structure of the scaled model using a lifting tool, and the circumferential cables and radial cables are lifted simultaneously. The fiber grating self-sensing steel strands monitor the stress changes of the cables in real time.

[0021] After the cable net structure is lifted to the predetermined height, the lower cables are installed and the length and initial tension of the lower cables are ensured to meet the design requirements. After the lower cables are installed, they are initially tensioned and the fiber grating self-sensing steel strands monitor the tension changes of the lower cables in real time.

[0022] The lifting sequence is planned according to the engineering design requirements and the force distribution, and the cable-supported grid structure units are gradually lifted. When all the cable-supported grid structure units are fully lifted, the fiber grating self-sensing steel strands are used to conduct a comprehensive detection of the stress state of the entire cable-supported grid structure.

[0023] As a further optional solution of the scaled model test method for the cable-supported grid roof, the method further includes performing a comprehensive force test on the cable-supported grid structure after the construction is completed, specifically including:

[0024] The stress state of the annular cables, radial cables and lower cables is tested to obtain the tension distribution of the entire cable-supported grid structure under static conditions without external loads;

[0025] The stress conditions of the key nodes of the cable-supported grid structure are obtained by stress monitoring.

[0026] A scale model test system for a cable-supported grid roof, comprising:

[0027] Establish a module for establishing a three-dimensional finite element model through finite element analysis software based on the structure of the cable-supported grid roof;

[0028] A determination module is used to determine the similarity ratio of the three-dimensional finite element model and the strength of the finished steel material according to the project requirements to obtain a scaled model;

[0029] A layout module is used to arrange the fiber grating self-sensing steel strands on the cables of the scaled model;

[0030] The monitoring module is used to monitor the cable force changes of the scaled model cables in real time based on the fiber grating self-sensing steel strands during the construction process simulation, thereby realizing the scaled model test of the cable-supported grid roof.

[0031] As a further optional solution of the scale model test system for cable-supported grid roof, the system further includes:

[0032] The tension distribution detection module is used to detect the stress state of the annular cables, radial cables and lower cables after the construction is completed, and obtain the tension distribution of the entire cable-supported grid structure under static conditions without external loads;

[0033] The key node stress detection module is used to monitor the stress of the key nodes of the cable-supported grid structure after the construction is completed to obtain the stress conditions of the key nodes.

[0034] A computing device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the scale model test method for cable-supported grid roof are implemented.

[0035] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the scaled model test method for a cable-supported grid roof.

[0036] The beneficial effects of the present invention are as follows: by establishing a three-dimensional finite element model through finite element analysis software, the structural characteristics of the cable-supported grid roof, including its stress state, deformation, etc., can be accurately simulated, providing a reliable theoretical basis for the subsequent scaled model design, and the determination of the similarity ratio and the strength of the finished steel material enables the scaled model to accurately reflect the mechanical behavior of the original structure, thereby improving the accuracy and effectiveness of the test under the premise of ensuring the safety of the test, arranging the fiber grating self-sensing steel strand on the cable of the scaled model, and the cable force change of the cable can be monitored in real time. The fiber grating sensor has the advantages of high precision, high sensitivity and long-term stability, and can accurately capture the cable during the test. The stress changes during the process can be monitored in real time, and the real-time monitoring data can be fed back to the test personnel in time, so as to adjust the test conditions or parameters in time and ensure the smooth progress of the test. Compared with the full-size test, the scaled model test can significantly reduce the material and labor costs required for the test. At the same time, since the scaled model can accurately reflect the mechanical behavior of the original structure, the test cost can be further reduced under the premise of ensuring the accuracy of the test. Through the scaled model test, the stress state of the cable-supported grid roof under different working conditions can be simulated, which provides an important basis for the optimization design. For example, the arrangement of the cables, the cross-sectional dimensions and other parameters can be adjusted according to the test results to improve the bearing capacity and stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a schematic flow chart of a scaled model test method for a cable-supported grid roof according to the present invention;

[0039] Figure 2 It is a schematic diagram of the composition of a scaled model test system for a cable-supported grid roof according to the present invention;

[0040] Figure 3 The figure is a schematic diagram of the composition of a computing device according to the present invention. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] refer to Figures 1 to 3 , a scaled model test method for cable-supported grid roof, specifically comprising:

[0043] According to the structure of the cable-supported grid roof, a three-dimensional finite element model is established using finite element analysis software;

[0044] According to the project requirements, determine the similarity ratio of the three-dimensional finite element model and the strength of the finished steel to obtain a scaled model;

[0045] Arrange the fiber Bragg grating self-sensing steel strands on the cables of the scaled model;

[0046] In the construction process simulation, the fiber grating self-sensing steel strands are used to monitor the cable force changes of the scaled model in real time, thereby realizing the scaled model test of the cable-supported grid roof.

[0047] In this embodiment, a three-dimensional finite element model is established by finite element analysis software, which can accurately simulate the structural characteristics of the cable-supported grid roof, including its stress state, deformation, etc., and provide a reliable theoretical basis for the subsequent scaled model design. The determination of the similarity ratio and the strength of the finished steel material enables the scaled model to accurately reflect the mechanical behavior of the original structure, thereby improving the accuracy and effectiveness of the test under the premise of ensuring the safety of the test. The fiber Bragg grating self-sensing steel strand is arranged on the cable of the scaled model, which can monitor the cable force changes of the cable in real time. The fiber Bragg grating sensor has the advantages of high precision, high sensitivity and long-term stability, and can accurately capture the cable during the test. The real-time monitoring data can be fed back to the test personnel in time to facilitate the timely adjustment of test conditions or parameters to ensure the smooth progress of the test. Compared with the full-size test, the scaled model test can significantly reduce the material and labor costs required for the test. At the same time, since the scaled model can accurately reflect the mechanical behavior of the original structure, the test cost can be further reduced under the premise of ensuring the accuracy of the test. Through the scaled model test, the stress state of the cable-supported grid roof under different working conditions can be simulated, which provides an important basis for the optimization design. For example, the arrangement of the cables, cross-sectional dimensions and other parameters can be adjusted according to the test results to improve the bearing capacity and stability of the structure.

[0048] Preferably, the similarity ratio of the three-dimensional finite element model and the strength of the finished steel are determined according to the project requirements to obtain a scaled model, which specifically includes:

[0049] According to the structural characteristics and test budget of the specific project, the similarity ratio of the three-dimensional finite element model is determined to obtain the initial scaled model;

[0050] The finished steel strength of the initial scaled model is designed by using the cross-section equivalent treatment method, the high-strength steel method, or the frame number reduction method to obtain the final scaled model.

[0051] In this embodiment, the similarity ratio of the scaled model is determined by comprehensively considering the structural complexity of the actual project, the purpose of the test, the available resources and the budget constraints. The selection of the similarity ratio needs to ensure that the model can reflect the stress characteristics and behavior of the actual structure, while considering the laboratory conditions and the operability of the test. By reasonably selecting the similarity ratio, the test cost and time can be reduced while ensuring the accuracy of the model, and the feasibility and efficiency of the test can be improved. The cross-sectional equivalent processing method is: when the strength of the steel used in the actual project is higher than the strength that can be achieved in the scaled model, the high-strength steel is equivalent to the steel of lower strength by keeping the cross-section of the rod unchanged and increasing the cross-sectional area, so as to ensure that the mechanical properties of the model are consistent with the actual structure; the high-strength steel method is: when the budget is sufficient and the model accuracy requirements are high, high-strength steel ( The scaled model components are made of steel (such as Q460 or Q355), but the thickness of the rods should be adjusted to meet the scale ratio requirements; the method of reducing the number of frames is: by reducing the number of frames of the cable-supported grid roof (that is, reducing the number of lateral units of the structure) and correspondingly increasing the cross-sectional size of each frame member, the structural model is simplified and the stiffness of the model is kept consistent with the actual project; the cross-sectional equivalent treatment method solves the problem that the strength of the finished steel in the scaled model does not meet the design requirements, ensuring that the model can accurately simulate the stress behavior of the actual structure. The high-strength steel method improves the accuracy and reliability of the model, which is particularly suitable for experiments with high requirements on structural details and stress states. The method of reducing the number of frames optimizes the model scale and reduces the experimental cost, while maintaining the stiffness and mechanical similarity of the model, which is conducive to obtaining effective test results within limited resources and time.

[0052] Preferably, the arrangement of the fiber Bragg grating self-sensing steel strands on the cables of the scaled model specifically includes:

[0053] Arrange fiber Bragg grating self-sensing steel strands on the annular cables, radial cables and lower cables of the scaled model. The fiber Bragg grating self-sensing steel strands are twisted together by a number of high-strength steel wires, and the fiber Bragg grating composite sensing tendons are embedded in the core steel wire grooves of the steel strands.

[0054] Connect the fiber Bragg grating composite sensor tendons through signal acquisition equipment, and perform initial data acquisition under unloaded static conditions to record the reference cable force values ​​of the annular cables, radial cables and lower cables under stress-free conditions;

[0055] After the initial data collection is completed, the stress conditions of the annular cables, radial cables and lower cables are monitored in real time.

[0056] In this embodiment, the fiber grating self-sensing steel strand is twisted from high-strength steel wire, which ensures the strength and durability of the cable. At the same time, the fiber grating composite sensing tendon is embedded in the core steel wire groove of the steel strand, so that the sensing element is closely combined with the cable structure and can directly sense the force change of the cable. The fiber grating sensor has the characteristics of high precision and high sensitivity, and can monitor the cable force change of the cable in real time without being affected by electromagnetic interference, thereby improving the accuracy and reliability of the monitoring data. Fiber grating self-sensing steel strands are arranged on the annular cables, radial cables and lower cables of the scaled model, realizing comprehensive real-time monitoring of the cable system, which helps to fully understand the stress state of the cable under different working conditions and provides an important basis for structural safety assessment and optimization design. Initial data acquisition is carried out under unloaded static conditions. The reference cable force values ​​of the annular cables, radial cables and lower cables in a stress-free state are recorded. This step provides reference data for subsequent real-time monitoring, which is convenient for analyzing the stress changes of the cables during loading. After the initial data collection is completed, the stress conditions of the annular cables, radial cables and lower cables are monitored in real time. Once the cable force is detected to be abnormal or exceeds the preset threshold, an early warning signal can be immediately issued to remind the test personnel or structural management personnel to take corresponding safety measures to avoid structural damage or safety accidents. The signal acquisition equipment is connected to the fiber grating composite sensor tendon to collect and transmit monitoring data in real time. These data can be analyzed and processed by special software to generate intuitive charts and reports, which are convenient for test personnel or structural management personnel to understand and analyze the stress state of the cables.

[0057] Preferably, the fiber grating sensing ribs are provided with at least one measuring point at different positions of each cable, and the length of the grating area of ​​the measuring point is 5 mm to 20 mm.

[0058] In this embodiment, by setting at least one measuring point at different positions of each cable, multi-point monitoring of the stress state of the cable can be achieved, which helps to more accurately capture the stress changes of the cable under different working conditions and improve the measurement accuracy and reliability. The grating length is controlled within the range of 5mm to 20mm, which not only ensures the sensitivity of the fiber grating sensor muscle, but also avoids the measurement error caused by the excessive length of the grating area. This design enables the sensor muscle to respond more accurately to the stress changes of the cable and improves the measurement accuracy; multi-point monitoring can achieve comprehensive coverage of the stress state of the cable, thereby avoiding excessive reliance on a single measuring point, which helps to more comprehensively understand the stress condition of the cable and optimize the monitoring efficiency. At the same time, due to the moderate length of the grating area, the sensor muscle has a fast response speed and can monitor the stress changes of the cable in real time, thereby improving the monitoring efficiency; through multi-point monitoring and precise measurement , abnormal stress conditions in the cable, such as stress concentration and fatigue damage, can be discovered in time, which helps to give early warning and take corresponding measures to avoid structural damage or safety accidents. Fiber Bragg Grating sensor tendons have long-term stability and high reliability, and can continue to work in harsh environments, providing long-term protection for structural safety; multi-point monitoring can generate a large amount of monitoring data, which can be analyzed and processed by special software. Through data analysis, we can deeply understand the stress characteristics and change laws of the cable, and provide an important basis for structural optimization design and maintenance management. At the same time, due to the moderate length of the grating area, the response signal of the sensor tendon is relatively stable, which is convenient for data collection and processing; this technical solution is suitable for different types of cables and different working conditions. By adjusting the number and position of measuring points and the length of the grating area, it can adapt to different monitoring needs and structural characteristics.

[0059] Preferably, in the construction process simulation, the real-time monitoring of the cable force change of the scaled model cable based on the fiber Bragg grating self-sensing steel strand specifically includes:

[0060] The circumferential and radial cables are laid on the base of the scaled model according to the design requirements, and the fiber grating self-sensing steel strands monitor the cable tension in the initial laying state in real time;

[0061] After the laying of the circumferential cables and radial cables is completed, one end of the radial cables is connected to the main structure of the scaled model using a lifting tool, and the circumferential cables and radial cables are lifted simultaneously. The fiber grating self-sensing steel strands monitor the stress changes of the cables in real time.

[0062] After the cable net structure is lifted to the predetermined height, the lower cables are installed and the length and initial tension of the lower cables are ensured to meet the design requirements. After the lower cables are installed, they are initially tensioned and the fiber grating self-sensing steel strands monitor the tension changes of the lower cables in real time.

[0063] The lifting sequence is planned according to the engineering design requirements and the force distribution, and the cable-supported grid structure units are gradually lifted. When all the cable-supported grid structure units are fully lifted, the fiber grating self-sensing steel strands are used to conduct a comprehensive detection of the stress state of the entire cable-supported grid structure.

[0064] In this embodiment, when the circumferential cables and radial cables are laid on the base of the scaled model according to the design requirements, the fiber grating self-sensing steel strand can monitor the cable force in the initial laying state in real time, which helps to ensure that the cables are not accidentally damaged or improperly pre-tensioned during the laying process, and provide accurate initial data for subsequent construction steps; after the circumferential cables and radial cables are laid, a lifting tool is used to connect one end of the radial cables to the main structure of the scaled model, and the circumferential cables and radial cables are lifted synchronously. During this process, the fiber grating self-sensing steel strand monitors the force changes of the cables in real time, and can promptly detect and correct possible uneven or abnormal force conditions, ensuring the overall stability and safety of the cable system; after the cable net structure is lifted to a predetermined height, the lower cables are installed, and ensure The length and initial tension of the lower cable meet the design requirements. After the lower cable is installed, it is initially tensioned. The fiber grating self-sensing steel strand monitors the tension changes of the lower cable in real time. This step helps to ensure the correct installation and tensioning of the lower cable and avoid safety hazards in subsequent construction. The lifting sequence is planned according to the engineering design requirements and force distribution, and the cable-supported grid structure units are gradually lifted. During the lifting process, the fiber grating self-sensing steel strand can monitor the stress state of the entire cable-supported grid structure in real time, and promptly discover and solve possible uneven force or structural instability problems. When all cable-supported grid structure units are fully hoisted, the fiber grating self-sensing steel strand is used to comprehensively detect the stress state of the entire cable-supported grid structure. This step helps to comprehensively evaluate the stability and safety of the entire structure.

[0065] Preferably, the method further comprises performing a comprehensive stress test on the cable-supported grid structure after the construction is completed, specifically comprising:

[0066] The stress state of the annular cables, radial cables and lower cables is tested to obtain the tension distribution of the entire cable-supported grid structure under static conditions without external loads;

[0067] The stress conditions of the key nodes of the cable-supported grid structure are obtained by stress monitoring.

[0068] In this embodiment, by detecting the stress state of the annular cables, radial cables and lower cables, the tension distribution of the entire cable-supported grid structure under static conditions without external loads can be obtained. This data is an important basis for evaluating the stability and safety of the structure, which helps to discover potential uneven stress or abnormal stress areas, and provides guidance for subsequent structural optimization and maintenance management; the key nodes of the cable-supported grid structure are often the areas with the most concentrated stress and are also the parts of the structure that are most likely to be damaged or failed. By monitoring the stress of these key nodes, their stress conditions can be obtained, and possible stress concentration or fatigue damage problems can be discovered and warned in time to ensure the safety of the structure; comprehensive stress detection can timely discover stress problems in the structure, such as uneven tension distribution and excessive stress at key nodes. Once these problems are discovered, measures can be taken immediately to repair or adjust them to avoid damage or failure of the structure during long-term use, thereby improving the safety and stability of the structure; by analyzing the detection data, the stress characteristics and change laws of the structure can be deeply understood, providing an important basis for the optimization of the structural design. For example, the arrangement and cross-sectional size of the cables can be adjusted according to the tension distribution to improve the bearing capacity and stability of the structure.

[0069] A scale model test system for a cable-supported grid roof, comprising:

[0070] Establish a module for establishing a three-dimensional finite element model through finite element analysis software based on the structure of the cable-supported grid roof;

[0071] A determination module is used to determine the similarity ratio of the three-dimensional finite element model and the strength of the finished steel material according to the project requirements to obtain a scaled model;

[0072] A layout module is used to arrange the fiber grating self-sensing steel strands on the cables of the scaled model;

[0073] The monitoring module is used to monitor the cable force changes of the scaled model cables in real time based on the fiber grating self-sensing steel strands during the construction process simulation, thereby realizing the scaled model test of the cable-supported grid roof.

[0074] Preferably, the system further comprises:

[0075] The tension distribution detection module is used to detect the stress state of the annular cables, radial cables and lower cables after the construction is completed, and obtain the tension distribution of the entire cable-supported grid structure under static conditions without external loads;

[0076] The key node stress detection module is used to monitor the stress of the key nodes of the cable-supported grid structure after the construction is completed to obtain the stress conditions of the key nodes.

[0077] A computing device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the scale model test method for cable-supported grid roof are implemented.

[0078] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the scaled model test method for a cable-supported grid roof.

[0079] 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 in the protection scope of the present invention.

Claims

1. A scale model test method for a cable-supported grid roof, characterized in that: Specifically include: According to the structure of the cable-supported grid roof, a three-dimensional finite element model is established using finite element analysis software; According to the project requirements, determine the similarity ratio of the three-dimensional finite element model and the strength of the finished steel to obtain a scaled model; Arrange the fiber Bragg grating self-sensing steel strands on the cables of the scaled model; In the construction process simulation, the fiber grating self-sensing steel strands are used to monitor the cable force changes of the scaled model in real time, thereby realizing the scaled model test of the cable-supported grid roof.

2. A scale model test method for a cable-supported grid roof according to claim 1, characterized in that: According to the project requirements, the similarity ratio of the three-dimensional finite element model and the strength of the finished steel are determined to obtain a scaled model, which specifically includes: According to the structural characteristics and test budget of the specific project, the similarity ratio of the three-dimensional finite element model is determined to obtain the initial scaled model; The finished steel strength of the initial scaled model is designed by means of cross-section equivalent treatment, high-strength steel or frame number reduction to obtain the final scaled model.

3. A scale model test method for a cable-supported grid roof according to claim 2, characterized in that: The method of arranging the fiber Bragg grating self-sensing steel strand on the cable of the scaled model specifically includes: Arrange fiber Bragg grating self-sensing steel strands on the annular cables, radial cables and lower cables of the scaled model. The fiber Bragg grating self-sensing steel strands are twisted together by a number of high-strength steel wires, and the fiber Bragg grating composite sensing tendons are embedded in the core steel wire grooves of the steel strands. Connect the fiber Bragg grating composite sensor tendons through signal acquisition equipment, and perform initial data acquisition under unloaded static conditions to record the reference cable force values ​​of the annular cables, radial cables and lower cables under stress-free conditions; After the initial data collection is completed, the stress conditions of the annular cables, radial cables and lower cables are monitored in real time.

4. A scale model test method for a cable-supported grid roof according to claim 3, characterized in that: The fiber grating sensing ribs are provided with at least one measuring point at different positions of each cable, and the length of the grating area of ​​the measuring point is 5 mm to 20 mm.

5. A scale model test method for a cable-supported grid roof according to claim 4, characterized in that: In the construction process simulation, the cable force change of the scaled model cable is monitored in real time based on the fiber grating self-sensing steel strand, specifically including: The circumferential and radial cables are laid on the base of the scaled model according to the design requirements, and the fiber grating self-sensing steel strands monitor the cable tension in the initial laying state in real time; After the laying of the circumferential cables and radial cables is completed, one end of the radial cables is connected to the main structure of the scaled model using a lifting tool, and the circumferential cables and radial cables are lifted simultaneously. The fiber grating self-sensing steel strands monitor the stress changes of the cables in real time. After the cable net structure is lifted to the predetermined height, the lower cables are installed and the length and initial tension of the lower cables are ensured to meet the design requirements. After the lower cables are installed, they are initially tensioned and the fiber grating self-sensing steel strands monitor the tension changes of the lower cables in real time. The lifting sequence is planned according to the engineering design requirements and the force distribution, and the cable-supported grid structure units are gradually lifted. When all the cable-supported grid structure units are fully lifted, the fiber grating self-sensing steel strands are used to conduct a comprehensive detection of the stress state of the entire cable-supported grid structure.

6. A scale model test method for a cable-supported grid roof according to claim 5, characterized in that: The method further includes performing a comprehensive stress test on the cable-supported grid structure after the construction is completed, specifically including: The stress state of the annular cables, radial cables and lower cables is tested to obtain the tension distribution of the entire cable-supported grid structure under static conditions without external loads; The stress conditions of the key nodes of the cable-supported grid structure are obtained by stress monitoring.

7. A scale model test system for cable-supported grid roof, characterized in that: include: Establish a module for establishing a three-dimensional finite element model through finite element analysis software based on the structure of the cable-supported grid roof; A determination module is used to determine the similarity ratio of the three-dimensional finite element model and the strength of the finished steel material according to the project requirements to obtain a scaled model; A layout module is used to arrange the fiber grating self-sensing steel strands on the cables of the scaled model; The monitoring module is used to monitor the cable force changes of the scaled model cables in real time based on the fiber grating self-sensing steel strands during the construction process simulation, thereby realizing the scaled model test of the cable-supported grid roof.

8. A scale model test system for cable-supported grid roof according to claim 7, characterized in that: The system further comprises: The tension distribution detection module is used to detect the stress state of the annular cables, radial cables and lower cables after the construction is completed, and obtain the tension distribution of the entire cable-supported grid structure under static conditions without external loads; The key node stress detection module is used to monitor the stress of the key nodes of the cable-supported grid structure after the construction is completed to obtain the stress conditions of the key nodes.

9. A computing device, characterized in that The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the scale model test method for a cable-supported grid roof as claimed in any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the scale model test method for cable-supported grid roof described in any one of claims 1 to 6 are implemented.

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