Method and system for evaluating the shearing performance of shear connectors of concrete structures

Abstract

The application relates to the field of numerical simulation and provides a method and system for evaluating the shearing performance of a shearing connector of a concrete structure, the method comprising the following steps: constructing a finite element model of a target shearing connector; calculating a shearing performance prediction value of the target shearing connector based on the finite element model; constructing a mechanics model based on the stress analysis result after stress analysis of the target shearing connector; calculating a shearing performance theoretical value of the target shearing connector based on the mechanics model; and evaluating the performance of the target shearing connector based on the shearing performance prediction value and the shearing performance theoretical value. The method is used to solve the defects that the complex interaction between the connector and the concrete, the material nonlinear behavior and the failure mechanism are difficult to accurately simulate in the related art, the prediction accuracy is insufficient, the design is conservative or potential risks exist, and the scheme can more accurately predict and evaluate the performance of the shearing connector.

Description

Technical Field

[0001] This invention relates to the field of numerical simulation technology, and in particular to a method and system for evaluating the shear performance of shear-resistant connectors in concrete structures. Background Technology

[0002] Precast concrete frame structures (PCFs) are widely used in low-rise to multi-story buildings due to their high construction efficiency, low material waste, and good structural integrity. However, the application of PCFs in high-rise buildings is limited, mainly because their structural stiffness and seismic resistance are relatively insufficient. To improve the seismic performance of PCFs, eccentric steel bracing (ESB) is often added, forming a precast concrete frame-eccentric steel bracing structure (PCF-ESB). In this system, the combination of steel bracing and energy-dissipating beam segments can significantly improve the lateral stiffness and energy dissipation capacity of the structure. Especially under strong earthquakes, the energy-dissipating beam segments dissipate energy through plastic deformation, thereby protecting the main structure from severe damage.

[0003] The connection performance between the energy dissipation beam segment and the concrete beam is a key factor affecting the overall seismic resistance of the PCF-ESB. The connection nodes must possess sufficient shear strength, good ductility, and ease of disassembly, while avoiding premature cracking or crushing of the concrete. Shear connectors are crucial force-transmitting elements in steel-concrete composite structures. Their fundamental function is to resist the longitudinal shear force generated at the interface between the concrete and steel members under load, preventing relative slippage between the two materials. This ensures that the two materials can form a unified whole and work collaboratively, fully leveraging the respective advantages of the tensile strength of steel and the compressive strength of concrete.

[0004] In engineering practice, the performance of shear connectors directly determines the load-bearing capacity, stiffness, ductility, and overall safety and reliability of composite structures. Common shear connector types include studs, steel shear keys, and perforated steel plate connectors, and their performance evaluation has long relied heavily on physical experiments and empirical formulas. However, traditional experimental methods are costly, time-consuming, and limited in parameter research, while existing theoretical models often struggle to accurately simulate the complex interactions between connectors and concrete, the nonlinear behavior of materials, and failure mechanisms, leading to insufficient prediction accuracy, conservative designs, or potential risks.

[0005] Therefore, developing an efficient, accurate, and systematic method for predicting the performance of shear connectors and an optimization design theory has become an urgent technical requirement to promote the development of composite structures towards greater safety, economy, and performance. Summary of the Invention

[0006] This invention provides a method and system for evaluating the shear performance of shear connectors in concrete structures. This addresses the shortcomings of related technologies, which struggle to accurately simulate the complex interaction between connectors and concrete, the nonlinear behavior of materials, and the failure mechanism. This results in insufficient prediction accuracy, overly conservative designs, or potential risks. The solution presented in this application can more accurately predict and evaluate the performance of shear connectors.

[0007] This invention provides a method for evaluating the shear performance of shear-resistant connectors in concrete structures, comprising: Construct a finite element model of the target shear-resistant connector; Based on the finite element model, the predicted shear performance of the target shear connector is calculated; After performing a stress analysis on the target shear connector, a mechanical model is constructed based on the stress analysis results; Based on the mechanical model, the theoretical value of the shear performance of the target shear-resistant connector is calculated; The performance of the target shear-resistant connector is evaluated based on the predicted shear performance value and the theoretical shear performance value.

[0008] According to the method for evaluating the shear performance of shear connectors in concrete structures provided by the present invention, the construction of a finite element model of the target shear connector includes: Obtain the structural and material characteristics of the target shear connector; A finite element model is constructed based on the structural and material characteristics described.

[0009] According to the method for evaluating the shear performance of shear connectors in concrete structures provided by the present invention, the step of calculating the predicted shear performance value of the target shear connector based on the finite element model includes: Input the shear condition of the target shear connector into the finite element model; Calculate the predicted shear performance of the target shear connector under shear conditions.

[0010] According to the method for evaluating the shear performance of shear connectors in concrete structures provided by the present invention, the performance evaluation of the target shear connector based on the predicted shear performance value and the theoretical shear performance value includes: Calculate the error value between the predicted shear performance value and the theoretical shear performance value; If the error value exceeds the set error range, the performance evaluation of the target shear connector is determined to be unqualified.

[0011] According to the method for evaluating the shear performance of shear connectors in concrete structures provided by the present invention, the performance evaluation of the target shear connector based on the predicted shear performance value and the theoretical shear performance value includes: Under different working conditions, the performance of the target shear-resistant connector is evaluated based on the predicted shear performance value and the theoretical shear performance value.

[0012] According to the method for evaluating the shear performance of shear connectors in concrete structures provided by the present invention, the predicted shear performance values ​​include the predicted yield load value, the predicted ultimate load value, the predicted initial stiffness value, and the predicted yield stiffness value of the target shear connector. The theoretical values ​​of shear performance include the theoretical values ​​of yield load, ultimate load, initial stiffness, and yield stiffness of the target shear connector. The performance evaluation of the target shear-resistant connector based on the predicted shear performance value and the theoretical shear performance value includes: Calculate the first error value between the predicted yield load value and the theoretical yield load value; Calculate a second error value between the predicted ultimate load value and the theoretical ultimate load value; Calculate the third error value between the predicted initial stiffness value and the theoretical initial stiffness value; Calculate the fourth error value between the predicted yield stiffness value and the theoretical yield stiffness value; If the first error value, and / or the second error value, and / or the third error value, and / or the fourth error value exceed the set error range, the performance evaluation of the target shear connector is determined to be unqualified.

[0013] This invention also provides a shear performance evaluation system for shear connectors in concrete structures, and applies a method for evaluating the shear performance of shear connectors in concrete structures, including: The finite element model building module is used to build the finite element model of the target shear-resistant connector; The prediction value calculation module is used to calculate the predicted value of the shear performance of the target shear-resistant connector based on the finite element model. The mechanical model construction module is used to construct a mechanical model based on the stress analysis results after performing a stress analysis on the target shear connector. The theoretical value calculation module is used to calculate the theoretical value of the shear performance of the target shear-resistant connector based on the mechanical model. The performance evaluation module is used to evaluate the performance of the target shear-resistant connector based on the predicted shear performance value and the theoretical shear performance value.

[0014] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the shear performance evaluation method for shear-resistant connectors of any of the above-described concrete structures.

[0015] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the shear performance evaluation method for shear connectors in any of the above-described concrete structures.

[0016] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements a method for evaluating the shear performance of shear-resistant connectors in any of the above-described concrete structures.

[0017] The method for evaluating the shear performance of shear connectors in concrete structures provided by this invention can construct a finite element model and a mechanical model for the shear connector to be evaluated. The finite element model is a virtual model that can predict the shear performance of the shear connector. The mechanical model is constructed after analyzing the stress on the target shear connector and can accurately reflect the theoretical value of the shear performance of the shear connector. Furthermore, the performance of the target shear connector can be evaluated based on the predicted value and the theoretical value. This method can overcome the limitations of existing theoretical and experimental methods and can efficiently and accurately predict the performance of shear connectors. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is one of the flowcharts illustrating the method for evaluating the shear performance of shear-resistant connectors in concrete structures according to an embodiment of the present invention; Figure 2 This is the second flowchart illustrating the method for evaluating the shear performance of shear connectors in concrete structures provided in this embodiment of the invention. Figure 3 This is a schematic diagram comparing load-displacement curves provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the model structure with shear-resistant connector provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structural wireframe of the structure with shear-resistant connector provided in the embodiment of the present invention; Figure 6This is a schematic diagram of the grid of a concrete beam provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the grid of the steel component provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the mesh of the shear connector provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the mesh of the reinforcing cage provided in an embodiment of the present invention; Figure 10 This is a stress cloud diagram of a concrete beam provided in an embodiment of the present invention; Figure 11 This is a stress cloud diagram of a steel component provided in an embodiment of the present invention; Figure 12 This is a stress cloud diagram of the shear connector provided in the embodiment of the present invention; Figure 13 This is a schematic diagram of the shear performance evaluation system for shear connectors in concrete structures provided in this embodiment of the invention. Figure 14 This is a schematic diagram of the physical structure of the electronic device provided in an embodiment of the present invention.

[0020] in: 1-Concrete beam; 2-Steel component; 3-Shear connector; 4-Reinforcing cage; 5-Loading zone; 6-Cross plate; 7-Strengthening side plate; 8-Bottom steel plate; 9-Concrete beam grid; 10 - Steel component mesh; 11 - Shear connector mesh; 12 - Plastic zone; 13 - Elastic region; 14 - Central axis. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] Figure 1 This is one of the flowcharts illustrating the method for evaluating the shear performance of shear connectors in concrete structures provided in this embodiment of the invention.

[0023] like Figure 1 As shown in the figure, this embodiment provides a method for evaluating the shear performance of shear-resistant connectors in concrete structures, including: Step 101: Construct the finite element model of the target shear connector; In practical applications, ABAQUS can be used to build finite element models of structures with shear-resistant connectors, enabling high-precision prediction of their shear performance.

[0024] Specifically, this may include the following steps: (1) Establish the solid component of the shear-resistant connector structure under test by stretching or cutting, and obtain the finite element model of the shear-resistant connector structure under test.

[0025] In this step, the solid component is modeled using stretching or cutting operations to obtain a finite element model of the shear connector that matches the actual geometry and has a reasonable mesh. This method is particularly suitable for embedded connectors with complex geometries, ensuring the accuracy of the model in critical stress areas.

[0026] (2) Define the constitutive models of steel and concrete materials, and import the actual materials of the structure to be tested with shear connectors into the finite element model of the shear connectors.

[0027] In this step, the actual material properties of concrete and steel are imported into the finite element model. A damage-plastic model can be used for concrete, and an elastoplastic constitutive model can be used for steel. Based on actual engineering material test data, parameters such as strength, elastic modulus, Poisson's ratio, yield strength, and hardening behavior are defined to ensure a true reflection of material behavior.

[0028] (3) Set the contact conditions between the shear connector and the steel member, the concrete beam and the steel member, and the boundary conditions of the shear connector, the concrete beam and the steel member.

[0029] This step involves setting the contact behavior between shear connectors and steel members, and between concrete beams and steel members. Typically, surface-to-surface contact is used, defining the tangential friction coefficient (e.g., 0.2-0.6, determined based on interface treatment) and normal hard contact. Simultaneously, based on the actual structural constraints, boundary conditions for shear connectors, concrete beams, and steel members are defined in the finite element model, such as fixed supports, hinged or sliding constraints, to accurately simulate the actual support state of the structure.

[0030] (4) Input the shear condition of the structure to be tested with shear connector into the finite element model of the shear connector. The shear condition includes the target displacement or ultimate deformation value of the shear connector.

[0031] In this step, the anticipated shear conditions from actual engineering projects are input into the model, such as monotonic or cyclic loading regimes. By applying displacement-controlled or force-controlled loads, the mechanical response of the shear connector at the target displacement or even up to the ultimate deformation state is simulated to evaluate its bearing capacity, stiffness degradation, and failure mode.

[0032] Step 102: Based on the finite element model, calculate the predicted value of the shear performance of the target shear-resistant connector; In practical applications, this step can extract key output data based on the finite element analysis results, including load-displacement curves, stress-strain distribution, plastic damage development, shear force of the connector, and interface slip. By analyzing these predicted values, the shear capacity, initial stiffness, ductility, and failure mechanism of the shear connector can be comprehensively evaluated, and the results can be compared and verified with theoretical calculations or experimental data, providing a quantitative basis for the design and engineering application of shear connectors.

[0033] In practice, the above-mentioned systematic finite element modeling and analysis process can efficiently and accurately predict the shear performance of embedded shear connectors in concrete structures, overcoming the limitations of high cost and long cycle of traditional tests, and providing a reliable technical means for the optimized design and seismic performance evaluation of shear connectors.

[0034] In this step, the predicted shear value of the shear connector can be obtained based on the finite element method, and the shear performance of the shear connector can be analyzed. This can overcome the limitations of existing theories and experimental methods, and can efficiently and accurately predict the performance of the embedded shear connector.

[0035] Step 103: After performing a stress analysis on the target shear connector, a mechanical model is constructed based on the stress analysis results; In practical applications, after establishing the mechanical model, the geometric parameters of the shear connector can be input into the shear theory model. The geometric parameters include the dimensions of the vane, stiffening side plate and bottom steel plate, and one or more of the Poisson's ratio and elastic modulus of the shear connector material. The shear connection calculation coefficient is input into the shear theory model to obtain the shear theory value of the shear connection assembly output by the shear theory model.

[0036] A theoretical shear model is constructed, incorporating methods for calculating the shear capacity of shear connectors. Geometric parameters of the shear connectors are collected and input into the theoretical shear model. These geometric parameters may include one or more of the following: the dimensions of the vane, stiffening side plates, and bottom steel plate of the shear connector; the Poisson's ratio of the shear connector material; and the elastic modulus of the shear connector material. The geometric parameters are consistent with the physical properties of the actual shear connectors to ensure the accuracy of the theoretical calculations.

[0037] To optimize the shear theoretical value model, adjusted, adapted, and simplified calculation coefficients can be input into the shear theoretical value model to improve the accuracy of theoretical calculations.

[0038] After inputting the geometric parameters and calculation coefficients, the shear theoretical value model is run to perform calculations and output the theoretical values ​​of the shear connection component under the expected shear conditions, including key performance indicators such as shear bearing capacity and deformation.

[0039] Establishing a theoretical value model of a structure with shear connectors can verify the output results of the finite element model of shear connectors and improve the functional stability of structures with shear connectors in engineering projects.

[0040] Furthermore, the method for calculating the shear bearing capacity of the shear connector includes a method for calculating the load value of a single shear connector and a method for calculating the stiffness of a single shear connector. The method for calculating the load value of a single shear connector is as follows: The initial shear stiffness calculation method for a single shear connector is as follows: , Wherein, Kc, K1, K2, and K3 are concrete influence parameters, including shear stiffness, connector cross-section, side plate cross-section, and number of shear connectors; α, β, γ, and δ are corresponding adjustment coefficients, with α valued at 0.029, resulting in final coefficients of 0.21 and 0.25, which are assigned to β and γ; and adjustment coefficient δ is −0.0096. ε corresponds to the coefficient for the number of shear connectors, which is 0.5% or 1.0% for one or two shear connectors; Fc is the concrete compressive strength; L is the length of the shear connector; n is the concrete strength coefficient; h is the width of the connector plate parallel to the shear load direction; t is the thickness of the shear connector; G and E are the shear and elastic tensile moduli; ν is Poisson's ratio; Vu is the ultimate shear force of the shear connector; and K0 is the initial shear stiffness of the shear connector.

[0041] Step 104: Based on the mechanical model, calculate the theoretical value of the shear performance of the target shear-resistant connector; Step 105: Based on the predicted shear performance value and the theoretical shear performance value, evaluate the performance of the target shear connector.

[0042] In practical applications, the error value between the predicted shear performance value and the theoretical shear performance value can be calculated; If the error value exceeds the set error range, the performance evaluation of the target shear connector is determined to be unqualified.

[0043] For example, the error calculation formula is ((predicted value - theoretical value) / theoretical value). 100%. For example, calculating the error between the predicted yield load value and the theoretical yield load value under shear.

[0044] The preset threshold can be 15%. Specifically, if the error of all feature values ​​is within 15%, the structure with shear connector is considered suitable for the project. If the error of any feature value is greater than or equal to 15%, the design method of the structure with shear connector or the shear connector of this size / type is considered not suitable for the project, and it can be redesigned and simulated again.

[0045] In an exemplary embodiment, the performance of the target shear-resistant connector can be evaluated under different working conditions based on the predicted shear performance value and the theoretical shear performance value.

[0046] In an exemplary embodiment, the predicted shear performance values ​​include the predicted yield load value, the predicted ultimate load value, the predicted initial stiffness value, and the predicted yield stiffness value of the target shear connector. The theoretical values ​​of shear performance include the theoretical values ​​of yield load, ultimate load, initial stiffness, and yield stiffness of the target shear connector. The performance evaluation of the target shear-resistant connector based on the predicted shear performance value and the theoretical shear performance value includes: Calculate the first error value between the predicted yield load value and the theoretical yield load value; Calculate a second error value between the predicted ultimate load value and the theoretical ultimate load value; Calculate the third error value between the predicted initial stiffness value and the theoretical initial stiffness value; Calculate the fourth error value between the predicted yield stiffness value and the theoretical yield stiffness value; If the first error value, and / or the second error value, and / or the third error value, and / or the fourth error value exceed the set error range, the performance evaluation of the target shear connector is determined to be unqualified.

[0047] The following is a detailed description of the method for evaluating the shear performance of shear connectors in concrete structures provided in this application, using a specific embodiment.

[0048] Figure 2This is the second flowchart illustrating the method for evaluating the shear performance of shear connectors in concrete structures provided in this embodiment of the invention.

[0049] like Figure 2 As shown in this specific embodiment, the method for evaluating the shear performance of shear connectors in concrete structures includes the following steps: Step 201: Determine the structure with shear-resistant connectors; Step 202: Determine the stress state of the shear connector, and clarify the forces borne by the shear connector at different stages of system operation. Step 203: Establish a theoretical shear model. Based on the stress conditions, establish a theoretical model of the shear-resistant connector under shear conditions. Step 204: Input the geometric parameters of the shear connector and match the finite element model; Step 205: Import the calculation coefficients for shear connectors; Step 206: Output the theoretical shear values ​​of the shear connector under shear conditions, such as load-displacement curves, etc. Step 207: Use ABAQUS to build a finite element model of the structure with shear-resistant connectors; Step 208: Define the constitutive model of the shear connector material and the stress-strain relationship of the material during the loading process; Step 209: Assembly of the structure with shear connectors: Assemble the shear connectors, concrete beams, steel components and reinforcing cages to form a complete device model; Step 210: Set interactions and boundary conditions, setting the interactions between components and the boundary conditions of the model; Step 211: Input the actual shear condition of the shear connector and fit the characteristics of the shear connector under shear conditions, such as the load-displacement curve; Step 212: Axial tension and compression load analysis, extracting the shear load and the plastic region distribution of shear-resistant connections; Step 213: Compare the results calculated by the finite element model with the results calculated by the theoretical model, and analyze the differences between the two; Step 214: Predict the shear performance of the structure with shear-resistant connectors and evaluate its performance under different working conditions.

[0050] Figure 2 This paper demonstrates the entire process of predicting the shear performance of structures with shear-resistant connectors. Modeling and analysis are carried out from both theoretical and finite element models. Finally, by comparing the results, the paper achieves accurate prediction of the shear performance of structures with shear-resistant connectors.

[0051] In practical terms, the above steps can efficiently and accurately establish a finite element model suitable for shear analysis of structures with shear connectors. This effectively handles the complex contact, large deformation, and nonlinear (including plastic) material behavior of shear connector components in the device (especially under bidirectional shear conditions). Furthermore, it effectively combines and verifies the model with classical theoretical models, ensuring the accuracy of the output assessment of the shear performance of structures with shear connectors.

[0052] Figure 3 This is a schematic diagram comparing load-displacement curves provided in an embodiment of the present invention.

[0053] like Figure 3 As shown, the shear prediction curve corresponding to the finite element model of the shear connector and the shear theoretical curve corresponding to the shear theoretical model are displayed. The two curves fit well, reflecting the dynamic response of the load with displacement during the shear process of the structure with shear connector.

[0054] The present invention also provides a structure with shear-resistant connectors. The structure with shear-resistant connectors to be tested may include a concrete beam 1, a steel component 2, shear-resistant connectors 3, and a reinforcing cage 4; wherein, the shear-resistant connectors 3 in the structure with shear-resistant connectors may include multiple shear-resistant connectors 3, and the reinforcing cage 4 is built into the concrete beam 1. Multiple shear connectors 3 are connected to the steel component 2 by welding or bolting in a side-by-side arrangement; each shear connector 3 is located on the central axis 14 of the steel component 2; the shear connector 3 is embedded in the concrete beam 1.

[0055] Figure 4 This is a schematic diagram of the model structure with shear-resistant connectors provided in an embodiment of the present invention.

[0056] Figure 5 This is a schematic diagram of the structural wireframe of the structure with shear-resistant connector provided in an embodiment of the present invention.

[0057] like Figure 4 and Figure 5 As shown, the structure to be tested with shear-resistant connectors may include a concrete beam 1, a steel component 2, a shear-resistant connector 3, and a reinforcing cage 4. Among them, the shear-resistant connector 3 is the core load-bearing component, bearing the main elastic deformation and load-bearing capacity; the reinforcing cage 4 provides tensile strength to the concrete beam 1, compensating for the insufficient tensile strength of the concrete; the shear-resistant connector 3 connects the two ends of the concrete beam 1 and the steel component 2, mainly bearing shear force, ensuring the connection performance between the concrete beam 1 and the steel component 2, and ensuring the stable operation of the device.

[0058] Shear connectors 3 can be installed in multiples or individually on the steel component 2. Multiple shear connectors 3 can be arranged regularly on the steel component 2 according to actual needs.

[0059] When multiple shear-resistant connectors are combined, the shear force value .

[0060] Where n is the number of shear connectors; Vu is the shear force of a single shear connector 3.

[0061] The loading zone 5 is located on the plane of one end of the steel member 2 near the first direction. The vertical load is applied here and transferred to the shear connector 3 through the steel member 2.

[0062] The shear-resistant connector 3 includes a cross plate 6, a stiffening side plate 7, and a bottom steel plate 8; the cross plate 6 and the bottom steel plate 8 are aligned at the center; the stiffening side plate 7 is welded to the short side of the cross plate 6 through its side edge; the cross plate 6 has a long limb and a short limb, wherein the stiffening side plate 7 is connected to the short limb; During assembly, each component has a central axis 14. All components can be assembled according to the position of the central axis 14, and the projections of the central axis 14 of all components are aligned.

[0063] After assembly, the shear connector 3 is embedded in the concrete beam 1 at one end near the bottom steel plate 8, and embedded along its entire length; the concrete beam 1 is in close contact with the steel component 2; The side of concrete beam 1 away from the loading point, the side of concrete beam 1 close to the loading point, and the side of steel component 2 at the loading end are coupled to a single point, which facilitates subsequent constraints on the device (constraints can be set only at the point, which is equivalent to setting constraints on the entire surface).

[0064] During assembly, multiple shear connectors are secured to predetermined positions on steel member 2 via their respective centers. The structure with shear connectors includes contacts between concrete beam 1 and steel member 2, shear connector 3 and concrete beam 1, steel member 2 and shear connector 3, and reinforcing cage 4 and concrete beam 1. During assembly, it is ensured that there are no gaps or overlapping portions between adjacent shear connectors. Finally, the entire device is debugged and tested to ensure tight fit between components and stable operation.

[0065] In practice, the structure with shear connector can be reciprocated to a single point, and the shear connector 3 in the structure is always kept in a shear state when the structure is under tension or compression.

[0066] Optionally, in the embodiments of this specification, the side length of the bottom steel plate 8 is greater than the width of the stiffening side plate 7; the long limb of the cross plate 6 is longer than the short limb; the total length of the long limb of the cross plate 6 is equal to the side length of the bottom steel plate 8; the size of the bottom steel plate 8 is smaller than that of the concrete beam 1; the size of the bottom steel plate 8 is smaller than that of the steel component 2.

[0067] When pressure is applied, since the shear connector 3 is fixed to the concrete beam 1 and the steel member 2, the ends of the shear connector 3 near the steel member 2 and the ends of the shear connector 3 near the steel member 2 move simultaneously, while the concrete beam 1 remains stationary due to constraint. This allows the shear connector 3 to be subjected to shear. When tension is applied, the force is transmitted from the steel member 2 to the shear connector 3. At this time, the ends of the shear connector 3 near the steel member 2 and the ends of the shear connector 3 near the steel member 2 move simultaneously, while the concrete beam 1 remains stationary due to constraint. This allows the shear connector 3 to be subjected to shear.

[0068] The direction of tension and compression is defined as follows: the direction of the first direction is compression, i.e., the first direction is compression; the direction opposite to the first direction is tension.

[0069] The distance between the concrete beam 1 and the steel member 2 is fixed. The shear connector 3 deforms under shear, causing the top of the concrete beam 1 to move closer to the top of the steel member 2. The different components work together to ensure that only one point needs to be loaded while the shear connector 3 remains under shear throughout the shear process.

[0070] Optionally, in the embodiments of this specification, the center point of one side of the steel member 2 is selected as the loading end and the load output point.

[0071] In practice, in order to ensure the accuracy of the deformation representation of the shear connector, the mesh size of the finite element model of the shear connector can be less than 1 / 2 of the thickness of the shear connector.

[0072] Figure 6 This is a schematic diagram of the grid of a concrete beam provided in an embodiment of the present invention.

[0073] Figure 7 This is a schematic diagram of the grid of the steel component provided in an embodiment of the present invention.

[0074] Figure 8 This is a schematic diagram of the mesh of the shear connector provided in an embodiment of the present invention.

[0075] Figure 9 This is a schematic diagram of the mesh of the reinforcing cage provided in an embodiment of the present invention.

[0076] like Figures 6 to 9 As shown, the finite element mesh generation of the entire structure with shear connectors is displayed, and the mesh details of a single shear connector are shown. The appropriate mesh density needs to be selected for components such as concrete beams, steel members, shear connectors and steel cages according to their stress characteristics.

[0077] Figure 10 Stress cloud diagram of a concrete beam provided for an embodiment of this specification; like Figure 10 As shown, the overall stress distribution of concrete beam 1 under loading is illustrated, and high-stress areas can be identified.

[0078] like Figure 11 As shown, the stress distribution of the shear connector 3 under load is displayed. The stress cloud map of the shear connector assembly includes the proportion of the plastic region of the shear connector assembly to the entire shear connector assembly region. Plasticity means reaching the yield stress value in the input material properties of the shear connector.

[0079] like Figure 11 As shown, the stress distribution of the shear connector 3 under load is displayed. The stress cloud map of the shear connector assembly includes the proportion of the plastic region of the shear connector assembly to the entire shear connector assembly region. Plasticity means reaching the yield stress value in the input material properties of the shear connector.

[0080] Figure 12 Stress cloud diagram of steel component assembly provided for embodiments of this specification.

[0081] like Figure 12 As shown, the overall stress distribution of steel component 2 under loading is illustrated, and high-stress areas can be identified.

[0082] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0083] The shear performance evaluation system for shear connectors in concrete structures provided by this invention is described below. The shear performance evaluation system for shear connectors in concrete structures described below can be referred to in correspondence with the shear performance evaluation method for shear connectors in concrete structures described above.

[0084] Figure 13 This is a schematic diagram of the shear performance evaluation system for shear connectors in concrete structures provided in this embodiment of the invention.

[0085] like Figure 13 As shown, the shear performance evaluation system for shear connectors in concrete structures provided in this embodiment includes: Finite element model construction module 1301 is used to construct the finite element model of the target shear-resistant connector; The prediction value calculation module 1302 is used to calculate the predicted value of the shear performance of the target shear-resistant connector based on the finite element model. The mechanical model construction module 1303 is used to construct a mechanical model based on the stress analysis results after performing a stress analysis on the target shear connector. The theoretical value calculation module 1304 is used to calculate the theoretical value of the shear performance of the target shear-resistant connector based on the mechanical model. The performance evaluation module 1305 is used to evaluate the performance of the target shear-resistant connector based on the predicted shear performance value and the theoretical shear performance value.

[0086] The specific implementation method of the shear performance evaluation system for shear connectors of concrete structures provided in this embodiment can be implemented with reference to the above embodiment, and will not be repeated here.

[0087] Figure 14 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 14 As shown, the electronic device may include: a processor 1410, a communication interface 1420, a memory 1430, and a communication bus 1440, wherein the processor 1410, the communication interface 1420, and the memory 1430 communicate with each other via the communication bus 1440. The processor 1410 can call logical instructions in the memory 1430 to execute a method for evaluating the shear performance of shear-resistant connectors in concrete structures, the method including: Construct a finite element model of the target shear-resistant connector; Based on the finite element model, the predicted shear performance of the target shear connector is calculated; After performing a stress analysis on the target shear connector, a mechanical model is constructed based on the stress analysis results; Based on the mechanical model, the theoretical value of the shear performance of the target shear-resistant connector is calculated; The performance of the target shear-resistant connector is evaluated based on the predicted shear performance value and the theoretical shear performance value.

[0088] Furthermore, the logical instructions in the aforementioned memory 1430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0089] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the shear performance evaluation method for shear-resistant connectors in concrete structures provided by the above methods, the method comprising: Construct a finite element model of the target shear-resistant connector; Based on the finite element model, the predicted shear performance of the target shear connector is calculated; After performing a stress analysis on the target shear connector, a mechanical model is constructed based on the stress analysis results; Based on the mechanical model, the theoretical value of the shear performance of the target shear-resistant connector is calculated; The performance of the target shear-resistant connector is evaluated based on the predicted shear performance value and the theoretical shear performance value.

[0090] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for evaluating the shear performance of shear-resistant connectors in concrete structures provided by the methods described above, the method comprising: Construct a finite element model of the target shear-resistant connector; Based on the finite element model, the predicted shear performance of the target shear connector is calculated; After performing a stress analysis on the target shear connector, a mechanical model is constructed based on the stress analysis results; Based on the mechanical model, the theoretical value of the shear performance of the target shear-resistant connector is calculated; The performance of the target shear-resistant connector is evaluated based on the predicted shear performance value and the theoretical shear performance value.

[0091] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0092] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the shear performance of shear-resistant connectors in concrete structures, characterized in that, include: Construct a finite element model of the target shear-resistant connector; Based on the finite element model, the predicted shear performance of the target shear connector is calculated; After performing a stress analysis on the target shear connector, a mechanical model is constructed based on the stress analysis results; Based on the mechanical model, the theoretical value of the shear performance of the target shear-resistant connector is calculated; The performance of the target shear-resistant connector is evaluated based on the predicted shear performance value and the theoretical shear performance value.

2. The method for evaluating the shear performance of shear-resistant connectors in concrete structures according to claim 1, characterized in that, The finite element model for constructing the target shear-resistant connector includes: Obtain the structural and material characteristics of the target shear connector; A finite element model is constructed based on the structural and material characteristics described.

3. The method for evaluating the shear performance of shear-resistant connectors in concrete structures according to claim 1, characterized in that, The calculation of the predicted shear performance of the target shear-resistant connector based on the finite element model includes: Input the shear condition of the target shear connector into the finite element model; Calculate the predicted shear performance of the target shear connector under shear conditions.

4. The method for evaluating the shear performance of shear-resistant connectors in concrete structures according to claim 1, characterized in that, The performance evaluation of the target shear-resistant connector based on the predicted shear performance value and the theoretical shear performance value includes: Calculate the error value between the predicted shear performance value and the theoretical shear performance value; If the error value exceeds the set error range, the performance evaluation of the target shear connector is determined to be unqualified.

5. The method for evaluating the shear performance of shear-resistant connectors in concrete structures according to claim 1, characterized in that, The performance evaluation of the target shear-resistant connector based on the predicted shear performance value and the theoretical shear performance value includes: Under different working conditions, the performance of the target shear-resistant connector is evaluated based on the predicted shear performance value and the theoretical shear performance value.

6. The method for evaluating the shear performance of shear-resistant connectors in concrete structures according to claim 4, characterized in that, The predicted shear performance values ​​include the predicted yield load, predicted ultimate load, predicted initial stiffness, and predicted yield stiffness of the target shear connector. The theoretical values ​​of shear performance include the theoretical values ​​of yield load, ultimate load, initial stiffness, and yield stiffness of the target shear connector. The performance evaluation of the target shear-resistant connector based on the predicted shear performance value and the theoretical shear performance value includes: Calculate the first error value between the predicted yield load value and the theoretical yield load value; Calculate a second error value between the predicted ultimate load value and the theoretical ultimate load value; Calculate the third error value between the predicted initial stiffness value and the theoretical initial stiffness value; Calculate the fourth error value between the predicted yield stiffness value and the theoretical yield stiffness value; If the first error value, and / or the second error value, and / or the third error value, and / or the fourth error value exceed the set error range, the performance evaluation of the target shear connector is determined to be unqualified.

7. A shear performance evaluation system for shear connectors in concrete structures, employing the shear performance evaluation method for shear connectors in concrete structures as described in any one of claims 1-6, characterized in that, include: The finite element model building module is used to build the finite element model of the target shear-resistant connector; The prediction value calculation module is used to calculate the predicted value of the shear performance of the target shear-resistant connector based on the finite element model. The mechanical model construction module is used to construct a mechanical model based on the stress analysis results after performing a stress analysis on the target shear connector. The theoretical value calculation module is used to calculate the theoretical value of the shear performance of the target shear-resistant connector based on the mechanical model. The performance evaluation module is used to evaluate the performance of the target shear-resistant connector based on the predicted shear performance value and the theoretical shear performance value.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for evaluating the shear performance of shear-resistant connectors in concrete structures as described in any one of claims 1-6.

9. A non-transitory computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method for evaluating the shear performance of shear-resistant connectors in concrete structures as described in any one of claims 1-6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method for evaluating the shear performance of shear-resistant connectors in concrete structures as described in any one of claims 1-6.

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