A method for upgrading the load of a node of a coupling beam of a free-standing column

Abstract

The application provides an independent column connecting beam node load upgrading method, and belongs to the technical field of connecting beam node load upgrading. The independent column connecting beam node load upgrading method comprises the following steps: disassembling the connecting beam node; fixing and measuring the connecting beam node by using a force measuring device to obtain the stress value of the connecting beam node; manufacturing an assembly test piece according to the stress value of the connecting beam node; stress measuring the assembly test piece and evaluating according to the obtained stress value; judging the reassembly feasibility of the assembly test piece according to the evaluation result; and grouping and reassembling the assembly test piece to replace the original connecting beam node structure. The application can construct an assembly test piece according to the stress vulnerable point of the original connecting beam node, and adapt to the load upgrading and reconstruction of the bridge connecting beam by reassembling the assembly test piece.

Description

Technical Field

[0001] This invention belongs to the field of load upgrading technology for connecting beam nodes, and specifically relates to a method for upgrading and modifying the load of independent column connecting beam nodes. Background Technology

[0002] With the continuous development of my country's transportation industry, the load-bearing capacity of bridges needs to be constantly improved. As a crucial component of the bridge load-bearing system, the performance of tie beams directly affects the safety and service life of bridges. Therefore, the improvement and upgrading of tie beams has become an important research direction in bridge engineering. In the improvement and upgrading of tie beams, the mechanical performance testing of joint assembly specimens is a key step.

[0003] Bridge deck load upgrading is a common method for upgrading the load-bearing capacity of tie beams. It allows for testing the performance of tie beams by applying different loads to the bridge deck without altering the bridge structure. This method is fast, efficient, and convenient, and is therefore widely used in bridge engineering. However, existing tie beam load-bearing capacity upgrading technologies struggle to meet the requirements of rapid and efficient retrofitting in modern bridge engineering. Therefore, a method for upgrading the load-bearing capacity of independent column tie beam nodes that can adapt to efficient bridge retrofitting is needed. Summary of the Invention

[0004] In view of this, the present invention provides a method for upgrading and modifying the load of independent column connecting beam nodes, which can construct assembly specimens based on the stress-prone points of the original connecting beam nodes, and adapt to the load-bearing load upgrade and modification of bridge connecting beams by reassembling the assembly specimens.

[0005] This invention is implemented as follows:

[0006] This invention provides a method for upgrading and modifying the load of an independent column-connected beam joint, comprising the following steps:

[0007] S10: Disassemble the connecting beam joint;

[0008] S20: Use a force measuring device to perform fixed measurements on the joint of the connecting beam to obtain the stress value of the joint;

[0009] S30: Based on the stress values ​​of the connecting beam nodes, prepare the assembly test specimen;

[0010] S40: Perform stress measurements on the assembled specimen and evaluate based on the obtained stress values;

[0011] S50: Based on the evaluation results, determine the feasibility of reassembling the assembly test piece.

[0012] S60: Replace the original connecting beam node structure with the assembled test pieces and reassemble them in groups.

[0013] Based on the above technical solution, the method for upgrading and modifying the load of independent column-connected beam joints of the present invention can be further improved as follows:

[0014] The specific steps for disassembling the connecting beam node include:

[0015] Step 1: First, number and mark the multiple connecting beam nodes at the bottom of the connecting beam;

[0016] Step 2: Group the connecting beam nodes with different numbers;

[0017] Step 3: Disassemble and reassemble the connecting beam nodes according to the grouping.

[0018] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by disassembling the connecting beam nodes at the bottom of the connecting beam by numbering and grouping, it is possible to always have an independent column to support the bottom of the connecting beam, and the grouped disassembly can ensure operational safety.

[0019] Furthermore, the connecting beam node includes supporting wall panels at both ends, and a load-bearing panel is provided on the supporting wall panel. The top surface of the load-bearing panel is used to contact the bottom end of the connecting beam. A load-bearing platform is provided at the bottom end of the supporting wall panel. The bottom end of the load-bearing platform and the connecting platform are fixedly connected to the top end of the independent column by anchor bolts. The bottom end of the connecting beam and the supporting wall panel are provided with matching anchor holes. Similarly, matching anchor holes are provided between the supporting wall panel and the load-bearing platform. Threaded anchor bolts are provided in each of the anchor holes.

[0020] Furthermore, the specific steps for using a force measuring device to perform fixed measurements on the connecting beam joints and obtain the stress values ​​of the connecting beam joints include:

[0021] Step 1: Secure the support arm plate of the connecting beam node to the stress testing device using the fixing components;

[0022] Step 2: Conduct stress tests on the supporting wall panel using a stress testing device;

[0023] Step 3: Gradually increase the magnitude of the stress applied by the stress testing device;

[0024] Step 4: Observe the shape changes of the support wall panel under stress and record and mark the stress-prone points of the support wall panel caused by different stress magnitudes.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by conducting stress test experiments on the connecting beam joints, it is possible to assess whether the stress borne by the current connecting beam joints can meet the allowable range of the upgrade design, thereby judging the stress status of the connecting beam joints; verifying the effectiveness of the connection between the connecting beams and the independent columns, and judging whether the strength and stiffness of the connecting beam joints can meet the upgrade design requirements.

[0026] Furthermore, the specific steps for fabricating the assembly specimen based on the stress values ​​at the joints of the connecting beams include:

[0027] Step 1: Similarly, stress test was conducted on the load-bearing platform of the connecting beam node using a stress testing device, and the maximum stress value borne by the load-bearing platform was recorded.

[0028] Step 2: Perform stress analysis based on the vulnerable points of the supporting wall panel;

[0029] Step 3: Based on the stress analysis, model the assembly specimen using digital modeling software to obtain the assembly specimen model;

[0030] The beneficial effects of adopting the above-mentioned improvement scheme are: to construct an assembly test model through experiments to meet the load of the upgraded connecting beam.

[0031] Furthermore, the specific steps for stress measurement of the assembled specimen and evaluation based on the obtained stress values ​​include:

[0032] Step 1: Assign material properties to the assembly test piece model for material constraints;

[0033] Step 2: Constrain the boundary conditions of the assembly specimen model, including constraint conditions and loading conditions. The constraint conditions are used to fix the main body of the assembly specimen model and restrict its movement, while the loading conditions are used to apply external loads to the assembly specimen model.

[0034] The third step is to divide the assembled specimen model into multiple finite element meshes. By dividing the continuous structure into discrete elements, external loads are applied to each element for stress analysis.

[0035] Step 4: Solve the stress numerically on the assembled specimen model through finite element analysis, and record and mark the stress magnitude of the assembled specimen model when the external load is gradually increased;

[0036] Step 5: Evaluate the application of the assembled specimen model based on the recorded values;

[0037] Furthermore, when assigning material properties to the assembled specimens, multiple different materials should be used to constrain the assembled specimen model. The mechanical properties of different materials, such as elastic modulus, yield strength, and density, can be used to reflect the differences in bearing strength of different materials under the same load-bearing stress.

[0038] Furthermore, the stress numerical results generated by the finite element analysis include the maximum stress load and deformation value of the assembled specimen structure under the maximum stress load, which is convenient for evaluating the strength and stiffness of the assembled specimen structure and identifying its stress problems and stress fatigue areas. Based on the numerical results of the finite element analysis, the assembled specimen model is verified and optimized. The maximum stress load range of the assembled specimen model must be greater than the standard value of the maximum stress load of the connecting beam design.

[0039] Furthermore, the specific steps for determining the feasibility of reassembling the assembly test piece based on the evaluation results include:

[0040] The assembled test specimen model that meets the stress load conditions is used to design a composite structure. The composite structure is used to meet the composite conditions between the connecting beam and the independent column. After the composite structure design is completed, it is put into physical production.

[0041] The assembly specimen includes an assembly wall panel with a contact platform on it. Both the upper and lower surfaces of the contact platform have a honeycomb-like dispersed structure. There are two sets of assembly wall panels. An arc-shaped reinforcing structure is provided at the bottom of the end of the assembly wall panel furthest from the contact platform. This arc-shaped reinforcing structure is used to evenly transmit the load on the assembly wall panel downwards. The assembly specimen also includes two sets of bearing seats. A corrugated reinforcement structure is fixedly connected to the bottom of each bearing seat. Each corner of the corrugated reinforcement structure has a buffer angle structure greater than 90 degrees. The assembly wall panel has mounting holes adapted to the bottom of the connecting beam. Similarly, the bearing seat has mounting holes adapted to the bottom of the connecting beam. The bottom of the bearing seat also has mounting holes adapted to the connecting platform.

[0042] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting up contact platforms and honeycomb-shaped dispersion structures to distribute the load, the load-bearing capacity and stability of the structure are increased, and the assembled wall panels can distribute the load evenly to the bearing seat through multiple points; by setting up bearing seats and corrugated reinforcement structures, the chamfered structure on the corrugated reinforcement structure can reduce the unnecessary transmission of the load, causing the load to bend or deform during the transmission process, thereby reducing the transmitted stress or stress moment.

[0043] Furthermore, the specific steps for replacing the original connecting beam node structure with the assembled test pieces and reassembling them in groups include:

[0044] First, align the two sets of bearing seats with the mounting holes at the bottom and the fixing holes on the connecting platform at the top of the independent column, and then fix them with anchor bolts; then, align the side panel mountings with the mounting holes on the connecting beam and fix them with threaded anchor bolts.

[0045] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: through experiments, an assembly test model that meets the load requirements of the upgraded connecting beam is obtained, and after designing the reassembled structure according to the connecting beam assembly structure, it is put into physical production to replace the original connecting beam node assembly structure, thereby realizing the transformation and upgrading of the maximum load support of the connecting beam.

[0046] Compared with existing technologies, the beneficial effects of the independent column connecting beam node load upgrading and transformation method provided by the present invention are as follows: by disassembling the connecting beam nodes at the bottom of the connecting beam in numbered groups, it is possible to always have an independent column to support the bottom of the connecting beam, and the group disassembly can ensure operational safety; by conducting stress testing experiments on the connecting beam nodes, it is possible to evaluate whether the stress borne by the current connecting beam nodes can meet the allowable range of the upgrade design, thereby judging the stress status of the connecting beam nodes; verifying the effectiveness of the connection between the connecting beam and the independent column, and judging whether the strength and stiffness of the connecting beam nodes can meet the upgrade design requirements; constructing an assembly specimen model through experiments to meet the load of the upgraded connecting beam; obtaining an assembly specimen model that meets the load of the upgraded connecting beam through experiments, and then carrying out physical production after designing a reassembly structure based on the connecting beam assembly structure, to replace the original assembly structure of the connecting beam nodes, thereby realizing the transformation and upgrading of the maximum load support of the connecting beam. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention 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.

[0048] Figure 1 A flowchart of a method for upgrading and modifying the load of an independent column-connected beam node;

[0049] Figure 2 This is a schematic diagram of an independent column-connected beam joint structure;

[0050] Figure 3 A schematic diagram of the front structure of an independent column-connected beam node;

[0051] Figure 4 This is a schematic diagram of the assembled test specimen structure;

[0052] The attached diagram lists the components represented by each number as follows:

[0053] 10. Supporting wall panel; 11. Bearing panel; 12. Load-bearing platform; 13. Connecting platform; 14. Connecting beam; 15. Independent column; 16. Threaded anchor bolt; 17. Assembled wall panel; 18. Contact platform; 19. Honeycomb dispersed structure; 20. Arc-shaped reinforced structure; 21. Bearing seat; 22. Corrugated reinforced structure. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0055] Example 1:

[0056] like Figure 1 The diagram shows a flowchart of a method for upgrading and modifying the load of an independent column-connected beam joint provided by the present invention, which includes the following steps:

[0057] S10: Disassemble the connecting beam joint;

[0058] S20: Use a force measuring device to perform fixed measurements on the joint of the connecting beam to obtain the stress value of the joint;

[0059] S30: Based on the stress values ​​of the connecting beam nodes, prepare the assembly test specimen;

[0060] S40: Perform stress measurements on the assembled specimen and evaluate based on the obtained stress values;

[0061] S50: Based on the evaluation results, determine the feasibility of reassembling the assembly test piece.

[0062] S60: Replace the original connecting beam node structure with the assembled test pieces and reassemble them in groups.

[0063] In the above technical solution, the specific steps for disassembling the connecting beam joint include:

[0064] First, number and mark the multiple connecting beam nodes at the bottom of the connecting beam;

[0065] The connecting beam nodes with different numbers are grouped, with odd numbers being group 1 and even numbers being group 2 from the beginning to the end;

[0066] According to the group, the connecting beam nodes are disassembled and reassembled. During disassembly, the support arm plates on both sides of the bottom end of the connecting beam are first removed by removing the threaded anchor bolts. Then, the load-bearing platform and the connecting platform are separated and the load-bearing platform is removed.

[0067] like Figure 2As shown in Figure 3, in the above technical solution, the connecting beam node includes supporting wall panels 10 at both ends. A bearing panel 11 is provided on the supporting wall panel 10. The top surface of the bearing panel 11 is used to contact the bottom end of the connecting beam 14. A load-bearing platform 12 is provided at the bottom end of the supporting wall panel 10. The bottom end of the load-bearing platform 12 and the connecting platform 13 are fixedly connected to the top end of the independent column 15 by anchor bolts. The bottom end of the connecting beam 14 and the supporting wall panel 10 are provided with matching anchor holes. Matching anchor holes are also provided between the supporting wall panel 10 and the load-bearing platform 12. Threaded anchor bolts 16 are provided in each anchor hole.

[0068] Furthermore, in the above technical solution, the specific steps for using a force measuring device to perform fixed measurements on the connecting beam joints and obtain the stress values ​​of the connecting beam joints include:

[0069] First, the support arm plate of the connecting beam node is clamped and fixed to the stress testing device using a fixing component;

[0070] The stress test device is used to conduct stress test on the support wall panel. The stress test device is used to activate the hydraulic telescopic rod to drive the pressure sensor and the sensing block to apply stress to the support wall panel. The stress sensor is used to monitor and read the stress value of the support wall panel in real time.

[0071] The stress applied to the support arm plate by a hydraulic step-by-step stress testing device is measured, with each step increasing the base value by 5% to 10% of the original maximum stress load of the connecting beam.

[0072] Observe the morphological changes of the supporting wall panel under progressively increasing stress, record and mark the locations of the stress-prone points of the supporting wall panel caused by different stress magnitudes, and the range of values ​​in which the supporting wall panel deforms due to the modified load stress design values ​​of the connecting beam.

[0073] Furthermore, in the above technical solution, the specific steps for fabricating the assembly specimen based on the stress values ​​of the connecting beam nodes include:

[0074] First, stress tests were conducted on the load-bearing platform of the connecting beam node using a stress testing device, and the maximum stress value borne by the load-bearing platform was recorded. The maximum stress was determined when deformation or even cracks were found in the load-bearing platform.

[0075] Then, stress analysis is performed based on the vulnerable points of the supporting wall panel;

[0076] Based on the stress analysis, the assembly specimen is modeled using digital modeling software to obtain the assembly specimen model;

[0077] Among them, the assembled specimen model is a new structure based on the original supporting wall panel and the original load-bearing platform, with optimized stress distribution.

[0078] Furthermore, in the above technical solution, the specific steps for stress measurement of the assembled specimen and evaluation based on the obtained stress values ​​include:

[0079] First, material properties are assigned to the assembly specimen model within the digital modeling software for material constraints. When assigning material properties to the assembly specimen, titanium alloy is selected to constrain the assembly specimen model. The mechanical properties of different materials, such as elastic modulus, yield strength, and density, are used to reflect the difference in bearing strength of different materials under the same load-bearing stress.

[0080] Among them, the elastic modulus refers to the stress that a material can withstand under a unit strain when subjected to external force; the yield strength refers to the stress that a material begins to undergo plastic deformation, i.e., lose its elasticity, when its strain reaches a certain level under the action of external force. The density of titanium alloy materials is usually between 7850 kg / m3 and 8400 kg / m3. Common titanium alloy materials include Ti-6Al-4V (ASTM standard), Ti-5Al-2.5Sn (ASTM standard), and Ti-6Al-6V-4Cr (ASTM standard). While possessing high strength, they also have excellent wear resistance and corrosion resistance.

[0081] Subsequently, the boundary conditions of the assembly specimen model are constrained. The boundary conditions include constraint conditions and loading conditions. The constraint conditions are used to fix the main body of the assembly specimen model and restrict its movement, while the loading conditions are used to apply external loads to the assembly specimen model.

[0082] The assembled specimen model is divided into multiple finite element meshes. By dividing the continuous structure into discrete elements, external loads are applied to each element for stress analysis.

[0083] The stress of the assembled specimen model was numerically solved by finite element analysis, and the stress magnitude of the assembled specimen model was recorded and marked when the external load was gradually increased.

[0084] The assembly test piece model was evaluated based on the recorded values.

[0085] Furthermore, in the above technical solution, the stress numerical results generated by the finite element analysis include the maximum stress load that the assembled specimen structure can withstand and the deformation value under the maximum stress load, which is convenient for evaluating the strength and stiffness of the assembled specimen structure and determining its stress problems and stress fatigue areas.

[0086] Furthermore, in the above technical solution, based on the numerical results of finite element analysis, the assembly specimen model is verified and optimized. The maximum stress load range of the assembly specimen model must be greater than the standard value of the maximum stress load of the connecting beam design.

[0087] Furthermore, in the above technical solution, the specific steps for determining the feasibility of reassembling the assembly test piece based on the evaluation results include:

[0088] The assembled test specimen model that meets the stress load conditions is used to design a composite structure. The composite structure is used to meet the composite conditions between the connecting beam and the independent column. After the composite structure design is completed, it is put into physical production.

[0089] like Figure 4 As shown, in the above technical solution, the assembly test piece includes an assembly wall panel 17, on which a contact platform 18 is provided. The upper and lower surfaces of the contact platform 18 are provided with honeycomb-shaped dispersion structures 19. There are two sets of assembly wall panels 17. An arc-shaped reinforcing structure 20 is provided at the bottom of the end of the assembly wall panel 17 away from the contact platform 18. The arc-shaped reinforcing structure 20 is used to uniformly transmit the load on the assembly wall panel 17 downwards. The assembly test piece also includes a bearing seat 21. There are two sets of bearing seats 21. A corrugated reinforcement structure 22 is fixedly connected to the bottom end of the bearing seat 21. The corners of the corrugated reinforcement structure 22 are all chamfered structures with a degree greater than 90 degrees. The assembly wall panel 17 is provided with mounting holes that are adapted to the bottom end of the connecting beam. The bearing seat 21 is also provided with mounting holes that are adapted to the bottom end of the connecting beam. The bottom end of the bearing seat 21 is provided with mounting holes that are adapted to the connecting platform 13.

[0090] Furthermore, in the above technical solution, the specific steps for replacing the original connecting beam node structure with assembled test pieces and reassembling them in groups include:

[0091] First, align the two sets of bearing seats 21 with the fixing holes on the connecting platform 13 at the top of the independent column 15 through the mounting holes at the bottom, and fix them in place with anchor bolts; then, fix the side assembly wall panels 17 by aligning them with the mounting holes on the connecting beam 14 and fixing them in place with threaded anchor bolts 16.

[0092] Example 2:

[0093] Includes the following steps:

[0094] S10: Disassemble the connecting beam joint;

[0095] S20: Use a force measuring device to perform fixed measurements on the joint of the connecting beam to obtain the stress value of the joint;

[0096] S30: Based on the stress values ​​of the connecting beam nodes, prepare the assembly test specimen;

[0097] S40: Perform stress measurements on the assembled specimen and evaluate based on the obtained stress values;

[0098] S50: Based on the evaluation results, determine the feasibility of reassembling the assembly test piece.

[0099] S60: Replace the original connecting beam node structure with the assembled test pieces and reassemble them in groups.

[0100] In the above technical solution, the specific steps for disassembling the connecting beam joint include:

[0101] First, number and mark the multiple connecting beam nodes at the bottom of the connecting beam;

[0102] The connecting beam nodes with different numbers are grouped, with odd numbers being group 1 and even numbers being group 2 from the beginning to the end;

[0103] According to the group, the connecting beam nodes are disassembled and reassembled. During disassembly, the support arm plates on both sides of the bottom end of the connecting beam are first removed by removing the threaded anchor bolts. Then, the load-bearing platform and the connecting platform are separated and the load-bearing platform is removed.

[0104] In the above technical solution, the connecting beam node includes supporting wall panels 10 at both ends. A bearing panel 11 is provided on the supporting wall panel 10. The top surface of the bearing panel 11 is used to contact the bottom end of the connecting beam 14. A load-bearing platform 12 is provided at the bottom end of the supporting wall panel 10. The bottom end of the load-bearing platform 12 and the connecting platform 13 are fixedly connected to the top end of the independent column 15 by anchor bolts. The bottom end of the connecting beam 14 and the supporting wall panel 10 are provided with matching anchor holes. Matching anchor holes are also provided between the supporting wall panel 10 and the load-bearing platform 12. Threaded anchor bolts 16 are provided in each anchor hole.

[0105] Furthermore, in the above technical solution, the specific steps for using a force measuring device to perform fixed measurements on the connecting beam joints and obtain the stress values ​​of the connecting beam joints include:

[0106] First, the support arm plate of the connecting beam node is clamped and fixed to the stress testing device using a fixing component;

[0107] The stress test device is used to conduct stress test on the support wall panel. The stress test device is used to activate the hydraulic telescopic rod to drive the pressure sensor and the sensing block to apply stress to the support wall panel. The stress sensor is used to monitor and read the stress value of the support wall panel in real time.

[0108] The stress applied to the support arm plate by a hydraulic step-by-step stress testing device is measured, with each step increasing the base value by 15% to 20% of the original maximum stress load of the connecting beam.

[0109] Observe the morphological changes of the supporting wall panel under progressively increasing stress, record and mark the locations of the stress-prone points of the supporting wall panel caused by different stress magnitudes, and the range of values ​​in which the supporting wall panel deforms due to the modified load stress design values ​​of the connecting beam.

[0110] Furthermore, in the above technical solution, the specific steps for fabricating the assembly specimen based on the stress values ​​of the connecting beam nodes include:

[0111] First, stress tests were conducted on the load-bearing platform of the connecting beam node using a stress testing device, and the maximum stress value borne by the load-bearing platform was recorded. The maximum stress was determined when deformation or even cracks were found in the load-bearing platform.

[0112] Then, stress analysis is performed based on the vulnerable points of the supporting wall panel;

[0113] Based on the stress analysis, the assembly specimen is modeled using digital modeling software to obtain the assembly specimen model;

[0114] Among them, the assembled specimen model is a new structure based on the original supporting wall panel and the original load-bearing platform, with optimized stress distribution.

[0115] Furthermore, in the above technical solution, the specific steps for stress measurement of the assembled specimen and evaluation based on the obtained stress values ​​include:

[0116] First, material properties are assigned to the assembly specimen model within the digital modeling software for material constraints. When assigning material properties to the assembly specimen, aluminum alloy is selected to constrain the assembly specimen model. The mechanical properties of different materials, such as elastic modulus, yield strength, and density, are used to reflect the differences in bearing strength of different materials under the same load-bearing stress.

[0117] Among them, the elastic modulus refers to the stress that a material can withstand under a unit strain when subjected to external force; the yield strength refers to the stress that a material begins to undergo plastic deformation and lose its elasticity when its strain reaches a certain level under the action of external force. The density of aluminum alloy materials is usually between 7750 kg / m3 and 7580 kg / m3. Common aluminum alloy materials include 7075, 2024, and 6061, which also have high strength and excellent heat resistance and corrosion resistance, making them suitable for maintaining stable performance in harsh environments.

[0118] Subsequently, the boundary conditions of the assembly specimen model are constrained. The boundary conditions include constraint conditions and loading conditions. The constraint conditions are used to fix the main body of the assembly specimen model and restrict its movement, while the loading conditions are used to apply external loads to the assembly specimen model.

[0119] The assembled specimen model is divided into multiple finite element meshes. By dividing the continuous structure into discrete elements, external loads are applied to each element for stress analysis.

[0120] The stress of the assembled specimen model was numerically solved by finite element analysis, and the stress magnitude of the assembled specimen model was recorded and marked when the external load was gradually increased.

[0121] The assembly test piece model was evaluated based on the recorded values.

[0122] Furthermore, in the above technical solution, the stress numerical results generated by the finite element analysis include the maximum stress load that the assembled specimen structure can withstand and the deformation value under the maximum stress load, which is convenient for evaluating the strength and stiffness of the assembled specimen structure and determining its stress problems and stress fatigue areas.

[0123] Furthermore, in the above technical solution, based on the numerical results of finite element analysis, the assembly specimen model is verified and optimized. The maximum stress load range of the assembly specimen model must be greater than the standard value of the maximum stress load of the connecting beam design.

[0124] Furthermore, in the above technical solution, the specific steps for determining the feasibility of reassembling the assembly test piece based on the evaluation results include:

[0125] The assembled test specimen model that meets the stress load conditions is used to design a composite structure. The composite structure is used to meet the composite conditions between the connecting beam and the independent column. After the composite structure design is completed, it is put into physical production.

[0126] The assembly specimen includes an assembly wall panel 17, on which a contact platform 18 is provided. Both the upper and lower surfaces of the contact platform 18 are provided with honeycomb-shaped dispersion structures 19. There are two sets of assembly wall panels 17. An arc-shaped reinforcing structure 20 is provided at the bottom of the end of the assembly wall panel 17 away from the contact platform 18. The arc-shaped reinforcing structure 20 is used to uniformly transmit the load on the assembly wall panel 17 downwards. The assembly specimen also includes a bearing seat 21, and there are two sets of bearing seats 21. A corrugated reinforcement structure 22 is fixedly connected to the bottom of the bearing seat 21. The corners of the corrugated reinforcement structure 22 are all chamfered structures with a degree greater than 90 degrees. The assembly wall panel 17 is provided with mounting holes that are adapted to the bottom of the connecting beam. The bearing seat 21 is also provided with mounting holes that are adapted to the bottom of the connecting beam. The bottom of the bearing seat 21 is provided with mounting holes that are adapted to the connecting platform 13.

[0127] Furthermore, in the above technical solution, the specific steps for replacing the original connecting beam node structure with assembled test pieces and reassembling them in groups include:

[0128] First, align the two sets of bearing seats 21 with the fixing holes on the connecting platform 13 at the top of the independent column 15 through the mounting holes at the bottom, and fix them in place with anchor bolts; then, fix the side assembly wall panels 17 by aligning them with the mounting holes on the connecting beam 14 and fixing them in place with threaded anchor bolts 16.

Claims

1. A method for load upgrade of a column-splice beam joint, characterized in that, The method comprises the following steps: S10: disassembling the tie beam node; S20: using a force measuring device to fix and measure the tie beam node to obtain the stress value of the tie beam node; S30: manufacturing an assembly test piece according to the stress value of the tie beam node; S40: stress measurement is performed on the assembly test piece, and evaluation is performed according to the obtained stress value; S50: judging the reassembly feasibility of the assembly test piece according to the evaluation result; S60: replacing the original tie beam node structure with the assembly test piece for grouping reassembly.

2. The method for upgrading the load of a column-beam connection node according to claim 1, characterized in that, The specific steps of disassembling the tie beam node comprise: First step: first, the multiple tie beam nodes at the bottom end of the tie beam are numbered and marked; Second step: grouping the tie beam nodes with different numbers; Third step: disassembling and packaging the tie beam nodes according to the grouping.

3. The method for upgrading the load capacity of a column-slab connection according to claim 2, wherein, The tie beam node comprises left and right end support wall plates (10), the support wall plates (10) are provided with bearing panels (11), the top surface of the bearing panels (11) is used for contacting the bottom end of the tie beam (14), the bottom end of the support wall plate (10) is provided with a bearing table (12), the bottom end of the bearing table (12) is fixedly connected with the top end of the independent column (15) through the anchor bolt, the bottom end of the tie beam (14) is provided with a matching anchor hole on the support wall plate (10), the support wall plate (10) and the bearing table (12) are also provided with matching anchor holes, and the anchor holes are provided with threaded anchor bolts (16).

4. The method for upgrading the load capacity of a column-slab connection according to claim 3, wherein, The specific steps of using the force measuring device to fix and measure the tie beam node to obtain the stress value of the tie beam node comprise: First step: clamping and fixing the support wall plate of the tie beam node to the stress testing device through a fixing assembly; Second step: stress force experiment is performed on the support wall plate through the stress testing device; Third step: gradually increasing the stress applied by the stress testing device; Fourth step: observing the morphological changes of the support wall plate under the stress and recording the stress vulnerable points of the support wall plate caused by different stress sizes.

5. The method for upgrading the load capacity of a column-slab connection according to claim 4, wherein, The specific steps of manufacturing the assembly test piece according to the stress value of the tie beam node comprise: First step: stress force experiment is performed on the bearing table of the tie beam node through the stress testing device, and the maximum stress value borne by the bearing table is recorded; Second step: stress analysis is performed according to the stress vulnerable points of the support wall plate; Third step: assembly test piece modeling is performed through digital modeling software according to the stress analysis, and an assembly test piece model is obtained.

6. The method for upgrading the load of a column-beam connection node according to claim 5, characterized in that, The specific steps of stress measurement on the assembly test piece and evaluation according to the obtained stress value comprise: First step: material properties are assigned to the assembly test piece model for material constraint; Second step: the boundary conditions of the assembly test piece model are constrained, including constraint conditions and loading conditions, wherein the constraint conditions are used for fixing the main part of the assembly test piece model to limit movement, and the loading conditions are used for applying external load to the assembly test piece model; Third step: the assembly test piece model is divided into multiple finite element grids, external load is applied on each unit to perform stress analysis by dividing the continuous structure into discrete units. Fourth step: through finite element analysis to the assembly of test specimen model for stress numerical solution, record and mark in the outside gradually increasing stress load, the assembly of test specimen model stress size; Fifth step: according to the record numerical value to the assembly of test specimen model for application evaluation.

7. The method for upgrading the load capacity of a column-slab connection according to claim 6, wherein, When assigning material properties to the assembly of test specimen, a variety of different materials should be selected to constrain the assembly of test specimen model, and the mechanical properties of different materials such as elastic modulus, yield strength and density are used to reflect the difference in bearing strength of different materials under the same bearing stress.

8. The method for upgrading the load of a column-beam connection node according to claim 7, characterized in that, The stress numerical results generated by finite element analysis include the maximum bearing stress load of the assembly of test specimen structure and the deformation value under the maximum stress load, which is convenient for evaluating the strength and stiffness of the assembly of test specimen structure and determining the stress problems and stress fatigue areas; according to the numerical results of finite element analysis, the assembly of test specimen model is verified and optimized, and the maximum stress load interval of the assembly of test specimen model should be greater than the standard numerical value of the maximum stress load of the connection beam design.

9. The method for upgrading the load of a column-beam connection node according to claim 8, characterized in that, The specific steps of judging the reassembly feasibility of the assembly of test specimen according to the evaluation results include: The assembly of test specimen model that meets the stress load condition is designed for reassembly structure, and the reassembly structure is used to meet the reassembly condition between the connection beam and the independent column; after the reassembly structure design is completed, the entity production is carried out; The assembly of test specimen includes assembly wallboards (17), the assembly wallboards (17) are provided with contact tables (18), the upper and lower surfaces of the contact tables (18) are provided with honeycomb dispersion structures (19), the number of the assembly wallboards (17) is two groups, the bottom of the end of the assembly wallboards (17) away from the contact tables (18) is provided with arc-shaped reinforcing structures (20), the arc-shaped reinforcing structures (20) are used to uniformly conduct the load received by the assembly wallboards (17) downward, the assembly of test specimen further includes bearing seats (21), the number of the bearing seats (21) is two groups, the bottom ends of the bearing seats (21) are fixedly connected with corrugated reinforcing structures (22), the corners of the corrugated reinforcing structures (22) are all provided with buffer angle structures greater than 90 degrees, mounting holes adapted to the bottom ends of the connection beams are formed in the assembly wallboards (17), mounting holes adapted to the bottom ends of the connection beams are also formed in the bearing seats (21), and the bottom ends of the bearing seats (21) are provided with mounting holes adapted to the connection tables (13).

10. The method of claim 9, wherein the method further comprises: The specific steps of replacing the original connection beam node structure with the assembly of test specimen for grouping reassembly include: First, align the mounting holes in the bottom ends of the two groups of bearing seats (21) with the fixed hole positions on the connection tables (13) at the top ends of the independent columns (15), and then fix and install through anchoring bolts; then align the mounting hole positions on the two side assembly wallboards (17) with the mounting holes on the connection beams (14), and then fix and install through threaded anchor bolts (16).

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