Finite element simulation analysis method for joint of joint bearing for building

Abstract

The invention discloses a finite element simulation analysis method for a joint bearing node for a building, and relates to the technical field of building structure simulation analysis, and the method comprises the steps: S1, building a three-dimensional model; s2, performing grid division on the three-dimensional model; s3, defining an analysis step; s4, defining material attributes; s5, establishing a contact pair; s6, defining a load and a constraint; applying a load in a coupling point mode; the origin of the global coordinate system is located at the spherical center of the knuckle bearing, and the coupling point is established in the load direction; the load is the resultant force of one-way load or multi-way load, and the load direction passes through the spherical center of the joint bearing of the building node; adding constraints to the three-dimensional model after the load is loaded; s7, submitting a calculation and output result; and S8, carrying out mechanical property analysis on a simulation result. According to the method, the load coupling point passes through the design of the spherical center of the knuckle bearing, so that the problem of possible deflection of the node under the action of the multidirectional load is avoided, and the calculation convergence and the simulation precision are improved.

Description

Technical Field

[0001] This invention relates to the technical field of building structure simulation analysis, specifically to a finite element simulation analysis method for joint bearing nodes in buildings. Background Technology

[0002] With the continuous development of architectural engineering design and construction technology, spherical bearing joints in buildings, as important structural connection components, directly affect the safety and stability of building structures. To accurately assess the stress state and deformation characteristics of spherical bearing joints under complex load conditions, finite element simulation analysis technology is widely used in building structural design.

[0003] However, existing technologies have significant limitations in load application methods. Building joint bearing nodes have three degrees of rotational freedom, allowing for certain rotational angles in these three directions during use. When simulating building nodes, there is a lack of an overall node loading method; only the stress on each component can be calculated before individual component loading simulations are performed. This simulation method cannot reflect the impact of deformation between components. Using the sum of simulation results for each component as the basis for node strength assessment fails to reflect the overall load-bearing capacity of the node. For example, the lug plate component may begin to yield, but the overall node rigidity may not have changed, and the overall node still has a large load-bearing margin. Although CN114996877A considers bolt preload and thermal assembly processes, the load application method under complex load conditions still needs improvement. CN113010976A proposes using transmission system simulation analysis software to obtain bearing support load data as the simulation analysis load, but it does not solve the problem of directional control when applying composite loads.

[0004] Furthermore, existing technologies lack sufficient research on simulation analysis methods for spherical bearing joints in construction under complex load conditions, particularly lacking an effective method to accurately simulate the stress state of spherical bearing joints under combined loads. This technological bottleneck severely restricts the performance evaluation and optimized design of spherical bearing joints in construction, necessitating the development of a more reasonable and accurate load application method to ensure the reliability and practicality of simulation analysis. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a finite element simulation analysis method for joint bearing nodes in construction.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows: A finite element simulation analysis method for joint bearing nodes in construction includes the following steps: S1. Create a 3D model of the joint bearing node for building in finite element software; or create a 3D model of the joint bearing node for building in 3D modeling software and then import it into finite element software for simulation analysis. S2, mesh the 3D model; S3, Define the analysis step. The analysis steps for building joint bearing nodes include the initial analysis step and the load analysis step. S4 defines material properties, assigning corresponding material properties to each component; S5, Establish contact pairs. Based on the actual contact size, establish individual contact pairs sequentially and set the corresponding contact conditions. S6, define loads and constraints; apply loads using coupling points; the origin of the global coordinate system is located at the center of the joint bearing sphere, and the coupling points must be located in the load direction; the load is the resultant force of a unidirectional or multidirectional load, and the load direction passes through the center of the joint bearing sphere of the building node; after the load is applied, add constraints to the 3D model; after applying the load under normal working conditions, use multiple load loading simulation, and determine the bearing capacity of the building joint bearing node based on the change in the stiffness curve of the building joint bearing node, and obtain the load factor of the ultimate bearing capacity of the building joint bearing node; S7, Submit the calculation and output results; S8 performs mechanical property analysis on the simulation results, and obtains stress distribution, deformation and displacement curve data of spherical bearing nodes for building use under given load conditions, providing a basis for design optimization and safety assessment of spherical bearing nodes for building use.

[0007] Optionally, in S2, all part meshes are hexahedral meshes, and mesh refinement is applied to contact areas.

[0008] Optionally, in S3, during the load analysis step, select static analysis as the analysis step type.

[0009] Optionally, in S4, material properties include elastic modulus, Poisson's ratio, yield strength, tensile strength, and elongation.

[0010] Optionally, in S5, before establishing a contact pair, it is necessary to set the contact attributes and contact control first, and then assign the corresponding contact pairs in sequence; set the contact friction attributes, and set the friction coefficient to 0.1.

[0011] Optionally, in S6, the origin of the global coordinate system is located on the center of the spherical bearing of the building node joint. The coordinates (x, y, z) of the coupling point in the global coordinate system are proportional to the multi-directional load values ​​(a kN, b kN, c kN), i.e., a / x = b / y = c / z or a / x = b / y or a / x = c / z or b / y = c / z, so that the resultant force of the multi-directional load at the coupling point always passes through the center of the spherical bearing of the building node joint or the origin of the global coordinate system.

[0012] The technical solution provided by this invention has the following beneficial effects: by designing the load coupling point to pass through the center of the spherical bearing, the problem of node deflection under multi-directional loads is avoided, which significantly improves the computational convergence and simulation accuracy. Due to the improvement in computational convergence and simulation accuracy, this model can be easily applied to actual building engineering projects, realizing efficient and stable operation of simulating spherical bearing nodes for building applications. Attached Figure Description

[0013] Figure 1 This is a simulation flowchart of this embodiment; Figure 2 This is a schematic diagram of the joint bearing node for building construction in this embodiment; Figure 3 This is a schematic diagram of the coupling point formed by the coupling between the reference point and the end face of the middle ear plate in this embodiment; Figure 4 This is a schematic diagram of the load and boundary constraint settings in this embodiment; Figure 5 This is a schematic diagram of the displacement curve under multiple loads in this embodiment.

[0014] Explanation of reference numerals in the attached diagram: 1. Middle ear plate; 2. Outer ear plate; 3. High-strength bolt assembly; 4. Bearing plate cover; 5. Positioning sleeve; 6. Pin; 7. Bolt assembly; 8. Pin plate cover; 9. Inner bearing ring; 10. Outer bearing ring. Detailed Implementation

[0015] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0016] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0017] Reference Figure 1-5 A finite element simulation analysis method for joint bearing nodes in construction based on Abaqus software includes the following steps: S1. Establish a 3D model of the spherical bearing node for building construction in finite element software; or establish a 3D model of the spherical bearing node for building construction in 3D modeling software, and then import it into finite element software for simulation analysis. The spherical bearing node includes a middle ear plate 1, an outer ear plate 2, a pin 6, a spherical bearing, a bearing cover plate, a pin 6 gland, a positioning sleeve 5, and a bolt group 7. Load transfer is achieved through the pin 6, primarily bearing in-plane tensile and compressive loads and limited out-of-plane loads.

[0018] S2. Mesh generation of the 3D model. Furthermore, all part meshes are generated using C3D8R hexahedral meshes, with mesh refinement applied to contact areas. The total number of meshes in the entire model is 149,324. Mesh refinement allows for smoother transitions in contact states, improves iterative stability, and significantly enhances the reliability of joint bearing node analysis.

[0019] S3 defines the analysis step. The analysis steps for the building joint bearing node include the initial analysis step and the load analysis step. In the load analysis step, the analysis step type is selected as static and general; the "basic" setting in the analysis step settings is set to the default value; in the incremental step settings, the maximum incremental step is set to 100, and the initial incremental step, minimum incremental step, and maximum incremental step are set to 1E-005, 1E-007, and 0.1, respectively.

[0020] S4 defines material properties, assigning corresponding material properties to each component. These material properties include elastic modulus, Poisson's ratio, yield strength, tensile strength, and elongation.

[0021] S5. Establish contact pairs. Based on the actual contact size, establish individual contact pairs sequentially and set the corresponding contact conditions. There are multiple contact pairs in the joint bearing nodes for building applications. When establishing contact pairs, establish one contact pair at a time based on the actual contact size, i.e., one master face and one slave face. Before establishing contact pairs, it is necessary to set contact attributes and contact control, and then assign the corresponding contact pairs sequentially; set the contact friction attributes, with the friction coefficient set to 0.1.

[0022] S6, define loads and constraints; apply loads using coupling points; the origin of the global coordinate system is located at the center of the spherical bearing, and the coupling points must be located in the load direction; the load is the resultant force of a unidirectional or multidirectional load, and the load direction passes through the center of the spherical bearing of the building node; after the normal working condition load is applied, add constraints to the 3D model to completely constrain the bottom of the outer lug 2 of the spherical bearing node; after the normal working condition load is applied, use multiple load loading simulation, and determine the bearing capacity of the building spherical bearing node based on the change in the stiffness curve of the building spherical bearing node, and obtain the load factor of the ultimate bearing capacity of the building spherical bearing node.

[0023] In this design, the coordinates (x, y, z) of the coupling point in the global coordinate system are proportional to the multi-directional load values ​​(a kN, b kN, c kN), i.e., a / x = b / y = c / z, or a / x = b / y, or a / x = c / z, or b / y = c / z. This ensures that the resultant force of the multi-directional load at the coupling point always passes through the center of the spherical bearing of the building node or the origin of the global coordinate system. The design of the load coupling point passing through the center of the spherical bearing avoids potential node deflection under multi-directional loads, significantly improving computational convergence and simulation accuracy. Furthermore, if multiple loads are applied, the coordinates of the coupling point do not need to be changed.

[0024] Specifically, the origin of the global coordinate system is located at the center of the ball of the spherical joint bearing at the building node, with the X direction being axial and the Y direction being radial. A reference point RP-1 is established. Taking simultaneous axial loading of 1500kN and radial loading of 9000kN as an example, a reference point RP-1 is established at coordinates (150, 900, 0), which is located in the direction of the resultant force (1500kN, 9000kN, 0kN). The reference point RP-1 is coupled to the end face of the middle ear plate 1, forming a coupling point. A concentrated load (1500kN, 9000kN, 0kN) is applied to the coupling point. The coordinate values ​​of the coupling point are proportional to the load value by a factor of 10, i.e., 1500 / 150 = 9000 / 900 = 10. After the load is applied, constraints are added to the assembly, fully constraining the bottom of the outer ear plate 2 (ENCASTRE). During multi-load simulation analysis, the coordinate values ​​of the coupling point remain unchanged, and the load is synchronously multiplied by a specified factor, as shown in the attached diagram. Figure 5 Schematic diagram of displacement curves under multiple loads.

[0025] S7. After checking whether the above steps are complete and correct, create a simulation task, submit the calculation, and output the results.

[0026] S8 performs mechanical property analysis on the simulation results, and obtains key data such as stress distribution, deformation or equivalent plastic strain, and displacement curves of spherical bearing nodes for building applications under given load conditions, providing a basis for design optimization and safety assessment of spherical bearing nodes for building applications.

[0027] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A finite element simulation analysis method for joint bearing nodes in construction, characterized in that, Including the following steps: S1. Create a 3D model of the joint bearing node for building in finite element software; or create a 3D model of the joint bearing node for building in 3D modeling software and then import it into finite element software for simulation analysis. S2, mesh the 3D model; S3, Define the analysis step. The analysis steps for building joint bearing nodes include the initial analysis step and the load analysis step. S4 defines material properties, assigning corresponding material properties to each component; S5, Establish contact pairs. Based on the actual contact size, establish individual contact pairs sequentially and set the corresponding contact conditions. S6, define loads and constraints; Loads are applied using a coupling point approach; the origin of the global coordinate system is located at the center of the joint bearing sphere, and the coupling point must be located in the load direction; the load is the resultant force of a unidirectional or multidirectional load, and the load direction passes through the center of the joint bearing sphere of the building node; constraints are added to the 3D model after the load is applied; after loading the load under normal working conditions, a multi-load loading simulation is performed, and the bearing capacity of the building joint bearing node is determined based on the change in the stiffness curve of the building joint bearing node, and the load factor of the ultimate bearing capacity of the building joint bearing node is obtained; S7, Submit the calculation and output results; S8 performs mechanical property analysis on the simulation results, and obtains stress distribution, deformation and displacement curve data of spherical bearing nodes for building use under given load conditions, providing a basis for design optimization and safety assessment of spherical bearing nodes for building use.

2. The finite element simulation analysis method for joint bearing nodes in construction according to claim 1, characterized in that: In S2, all part meshes are hexahedral meshes, and mesh refinement is applied to contact areas.

3. The finite element simulation analysis method for joint bearing nodes in construction according to claim 1, characterized in that: In S3, during the load analysis step, select static analysis as the analysis step type.

4. The finite element simulation analysis method for joint bearing nodes in construction according to claim 1, characterized in that: In S4, material properties include elastic modulus, Poisson's ratio, yield strength, tensile strength, and elongation.

5. The finite element simulation analysis method for joint bearing nodes in construction according to claim 1, characterized in that: In S5, before establishing a contact pair, you need to set the contact attributes and contact control first, and then assign the corresponding contact pairs in sequence; set the contact friction attributes, and set the friction coefficient to 0.

1.

6. The finite element simulation analysis method for a joint bearing node in construction according to claim 1, characterized in that: In S6, the origin of the global coordinate system is located at the center of the spherical bearing of the building node joint. The coordinates (x, y, z) of the coupling point in the global coordinate system are proportional to the multi-directional load values ​​(a kN, b kN, c kN), i.e., a / x = b / y = c / z or a / x = b / y or a / x = c / z or b / y = c / z, so that the resultant force of the multi-directional load at the coupling point always passes through the center of the spherical bearing of the building node joint or the origin of the global coordinate system.

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