A simulation method for mechanical response characteristics of U-shaped steel bracket

Abstract

The present application discloses a method for simulating the mechanical response characteristics of a U-shaped steel bracket, comprising: establishing a finite element model of the U-shaped steel bracket; performing a static analysis on the finite element model of the U-shaped steel bracket to obtain a static analysis result; and performing a dynamic analysis on the finite element model of the U-shaped steel bracket according to the static analysis result to obtain a simulation result of the mechanical response characteristics of the U-shaped steel bracket. The present invention truly and objectively reflects the sliding and shrinking behavior of the overlapped parts of the U-shaped steel bracket for mining, can simulate the actual stress states of the U-shaped steel bracket such as bending, torsion, tensile shear and compression shear, can accurately simulate the mechanical response behavior of the U-shaped steel bracket for mining, and provide theoretical guidance for engineering practice.

Description

Technical Field

[0001] The present invention relates to the field of mining engineering technology, and in particular to a method, device, electronic equipment and computer-readable storage medium for simulating mechanical response characteristics of a U-shaped steel support. Background Art

[0002] As the depth of underground mining continues to increase, the support problems brought by deep soft rock tunnels are becoming increasingly prominent. For deep high-stress soft rock tunnels, the use of U-shaped steel retractable supports for mining and coordinated support with anchors or cables is a more effective measure to control surrounding rock deformation. The U-shaped steel beam material for mining is rolled into the curved or straight leg shape required for a specific tunnel section, and then the ends of different steel beams are overlapped, pre-tightened and fixed to finally form a combined form of U-shaped steel support for mining. However, the bearing characteristics of the support and the response behavior under differentiated load conditions, as well as the coupling mechanism of the support-anchor / cable, need further study.

[0003] At present, the simulation methods of mechanical response behavior characteristics of U-shaped steel used in mining are mainly based on finite element software and block discrete element software in geotechnical engineering. The existing structural units in the software are used to establish a simplified model of the bracket. However, this model uses one-dimensional linear units to represent the U-shaped steel bracket, which can only reflect the axial force and shear force distribution characteristics of the bracket, and cannot truly reflect the actual stress state of the U-shaped steel bracket used in mining, such as torsion, tension shear and compression shear. At the same time, in the above model, the U-shaped steel bracket model used in mining is simplified to a fixed whole for analysis, ignoring the shrinkable characteristics of the bracket at the overlap and the influence of the cable preload on its mechanical response behavior. The simulation results are significantly different from the actual working conditions.

[0004] Therefore, it is necessary to provide a method for simulating the mechanical response characteristics of a U-shaped steel support, which can simulate the mechanical response behavior of the U-shaped steel support for mining in a more realistic manner and provide theoretical guidance for engineering practice. Summary of the invention

[0005] In view of this, it is necessary to provide a method, device, electronic device and computer-readable storage device for simulating the mechanical response characteristics of a U-shaped steel support, so as to solve the problem that the simulation results of the mechanical response behavior of the U-shaped steel support for mining in the prior art are significantly different from the actual working conditions and cannot truly reflect the stress conditions of the U-shaped steel support for mining.

[0006] In order to solve the above problems, the present invention provides a method for simulating the mechanical response characteristics of a U-shaped steel bracket, comprising:

[0007] Establish the finite element model of the U-shaped steel bracket;

[0008] Performing static analysis on the finite element model of the U-shaped steel bracket to obtain static analysis results;

[0009] According to the static analysis results, a dynamic analysis is performed on the finite element model of the U-shaped steel bracket to obtain a simulation result of the mechanical response characteristics of the U-shaped steel bracket.

[0010] Furthermore, a finite element model of the U-shaped steel bracket is established, including:

[0011] Establish the finite element model of each component of the U-shaped steel bracket;

[0012] Setting material parameters of the finite element models of the various components;

[0013] The finite element models of the various components are combined into a supporting whole, and the contact relationship and constraint relationship in the supporting whole are determined to obtain a finite element model of the U-shaped steel bracket.

[0014] Furthermore, a static analysis is performed on the finite element model of the U-shaped steel bracket to obtain static analysis results, including:

[0015] According to the U-shaped steel bracket finite element model, setting the model static analysis parameters;

[0016] The U-shaped steel bracket finite element model is subjected to static analysis according to the static analysis parameters of the model to obtain a static analysis result.

[0017] Furthermore, according to the U-shaped steel bracket finite element model, the model static analysis parameters are set, including:

[0018] The static load and static boundary conditions applied to the U-shaped steel bracket finite element model are set.

[0019] Further, a static analysis is performed on the U-shaped steel bracket finite element model according to the model static analysis parameters to obtain a static analysis result, including:

[0020] Meshing the finite element model of the U-shaped steel bracket after the static analysis parameters are set;

[0021] A static analysis is performed on the meshed U-shaped steel bracket finite element model to obtain a static analysis result.

[0022] Furthermore, according to the static analysis results, a dynamic analysis is performed on the finite element model of the U-shaped steel bracket, including:

[0023] Setting dynamic analysis parameters for the finite element model of the U-shaped steel bracket;

[0024] A dynamic analysis is performed on the finite element model of the U-shaped steel bracket according to the dynamic analysis parameters.

[0025] Furthermore, according to the method for simulating mechanical response characteristics of a U-shaped steel support according to claim 6, it is characterized in that the dynamic analysis parameters of the finite element model of the U-shaped steel support are set, including:

[0026] The dynamic load and dynamic boundary conditions are set for the U-shaped steel bracket structure model.

[0027] The present invention also provides a U-shaped steel bracket mechanical response characteristic simulation device, comprising:

[0028] Model building module, used to build the finite element model of the U-shaped steel bracket;

[0029] A static analysis module, used to perform static analysis on the finite element model of the U-shaped steel bracket to obtain a static analysis result;

[0030] The dynamic analysis module is used to perform dynamic analysis on the finite element model of the U-shaped steel bracket according to the static analysis result, so as to obtain the simulation result of the mechanical response characteristics of the U-shaped steel bracket.

[0031] The present invention also provides an electronic device, comprising a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, a method for simulating the mechanical response characteristics of a U-shaped steel bracket as described above is implemented.

[0032] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, a method for simulating the mechanical response characteristics of a U-shaped steel bracket as described in any of the above technical solutions is implemented.

[0033] Compared with the prior art, the beneficial effects of the present invention include: first, establishing a finite element model of a U-shaped steel bracket; second, performing a static analysis on the finite element model of the U-shaped steel bracket to obtain a static analysis result; finally, according to the static analysis result, performing a dynamic analysis on the finite element model of the U-shaped steel bracket to obtain a simulation result of the mechanical response characteristics of the U-shaped steel bracket. The present invention establishes a finite element model of a U-shaped steel bracket to make the entity model more in line with the actual situation of engineering application; by performing a static analysis on the finite element model of the U-shaped steel bracket, the sliding shrinkage behavior of the overlapped part of the mining U-shaped steel bracket is truly and objectively reflected, and the shrinkage characteristics of the overlapped part and its influence on the mechanical response behaviors such as the bearing capacity and deformation characteristics of different parts of the bracket can be quantitatively studied; at the same time, based on the static analysis results, the finite element model of the U-shaped steel bracket is dynamically analyzed, and different external load conditions such as pressure, tension and torsion can be set, which truly reflects the actual stress states such as bending, torsion, tension shear and compression shear of the mining U-shaped steel bracket, and objectively inverts the three-dimensional mechanical response characteristics of the mining U-shaped steel bracket under different external loads. The present invention can objectively and truly simulate the mechanical response behavior of the U-shaped steel support for mining, and provide theoretical guidance for engineering practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a flow chart of an embodiment of a method for simulating mechanical response characteristics of a U-shaped steel bracket provided by the present invention;

[0035] Figure 2 A schematic diagram of an embodiment of a finite element model of a U-shaped steel bracket component provided by the present invention;

[0036] Figure 3 A schematic structural diagram of an embodiment of a supporting structure composed of various components provided by the present invention;

[0037] Figure 4 A schematic diagram of an interface for setting U-shaped steel material parameters according to an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of an embodiment of the static boundary conditions of the finite element model of a U-shaped steel bracket provided by the present invention;

[0039] Figure 6 Mises cloud for static analysis of the finite element model of the U-shaped steel bracket provided by the present invention Figure 1 A schematic diagram of an embodiment;

[0040] Figure 7 A schematic diagram of an embodiment of applying a uniformly distributed load to a finite element model of a U-shaped steel bracket provided by the present invention;

[0041] Figure 8Mises cloud diagram and displacement cloud diagram for dynamic analysis of finite element model of U-shaped steel bracket provided by the present invention Figure 1 A schematic diagram of an embodiment;

[0042] Fig. 9 A flow chart of an embodiment of a method for numerically simulating the mechanical response behavior of a U-shaped steel retractable support for mining using ABAQUS software provided by the present invention;

[0043] Fig.10 A schematic structural diagram of an embodiment of a U-shaped steel bracket mechanical response characteristic simulation device provided by the present invention;

[0044] Fig.11 A structural block diagram of an embodiment of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0046] The present invention provides a method, device and computer-readable storage medium for simulating the mechanical response characteristics of a U-shaped steel bracket, the method comprising: establishing a finite element model of the U-shaped steel bracket; analyzing the mechanical response behavior of the U-shaped steel bracket in actual overlap by static analysis; simulating various mechanical response characteristics of the U-shaped steel bracket under different surrounding rock load conditions in practice by dynamic analysis, which can more realistically and objectively reflect the mechanical response behavior characteristics of the U-shaped steel bracket and provide theoretical guidance for engineering practice. The following are detailed descriptions.

[0047] The embodiment of the present invention provides a method for simulating the mechanical response characteristics of a U-shaped steel bracket, and its flow chart is as follows: Figure 1 As shown, including:

[0048] Step S101, establishing a finite element model of a U-shaped steel bracket;

[0049] Step S102, performing static analysis on the finite element model of the U-shaped steel bracket to obtain a static analysis result;

[0050] Step S103: According to the static analysis result, a dynamic analysis is performed on the finite element model of the U-shaped steel bracket to obtain a simulation result of the mechanical response characteristics of the U-shaped steel bracket.

[0051] Compared with the prior art, the present embodiment provides a method for simulating the mechanical response characteristics of a U-shaped steel bracket. First, a finite element model of the U-shaped steel bracket is established; secondly, a static analysis is performed on the finite element model of the U-shaped steel bracket to obtain a static analysis result; finally, based on the static analysis result, a dynamic analysis is performed on the finite element model of the U-shaped steel bracket to obtain a simulation result of the mechanical response characteristics of the U-shaped steel bracket. The present invention establishes a finite element model of a U-shaped steel bracket, so that the entity model is more in line with the actual situation of engineering application; by performing static analysis on the finite element model of the U-shaped steel bracket, the sliding shrinkage behavior of the overlapped part of the mining U-shaped steel bracket is truly and objectively reflected, and the shrinkage characteristics of the overlapped part and its influence on the mechanical response behaviors such as the bearing capacity and deformation characteristics of different parts of the bracket can be quantitatively studied; at the same time, based on the static analysis results, the finite element model of the U-shaped steel bracket is dynamically analyzed, and different external load conditions such as pressure, tension and torsion can be set to truly reflect the actual stress states such as bending, torsion, tension shear and compression shear of the mining U-shaped steel bracket, and objectively invert the three-dimensional spatial mechanical response characteristics of the mining U-shaped steel bracket under different external loads. The present invention can objectively and truly simulate the mechanical response behavior of the mining U-shaped steel bracket, and provide theoretical guidance for engineering practice.

[0052] As a specific embodiment, in step S101, a finite element model of a U-shaped steel bracket is established by modeling software. In order to improve the accuracy of the model and make the model more in line with the actual engineering situation, ABAQUS modeling software is used to establish the finite element model of the U-shaped steel bracket.

[0053] As a preferred embodiment, in step S101, a finite element model of a U-shaped steel bracket is established, including:

[0054] Establish the finite element model of each component of the U-shaped steel bracket;

[0055] Setting material parameters of the finite element models of the various components;

[0056] The finite element models of the various components are combined into a supporting whole, and the contact relationship and mechanical constraint relationship in the supporting whole are determined to obtain a finite element model of the U-shaped steel bracket.

[0057] As a specific embodiment, establishing the finite element model of each component of the U-shaped steel support includes: establishing a component model of a U-shaped steel retractable support for mining according to actual working conditions; the U-shaped steel retractable support is composed of a U-shaped steel multi-section beam, a cable, a bolt and a gasket; wherein the U-shaped steel multi-section beam constitutes the legs and top beam of the U-shaped steel support. According to the position of the support components in actual working conditions, the model components are assembled into a support whole through steps such as translation and rotation.

[0058] like Figure 2 As shown, Figure 2Schematic diagram of the finite element model of each component of the U-shaped steel support in this embodiment. In the figure, the U-shaped steel beam component model adopts the national standard data of 36U-shaped steel for mining. The 36U-shaped steel section is drawn in the CAD software, imported into the ABAQUS software, and the U-shaped steel beam component model is generated by stretching. Similarly, other components such as cables and bolts can be generated. The support structure composed of the finite element models of the various components is shown in FIG. Figure 3 shown.

[0059] By establishing finite element models of U-shaped steel multi-section beams, cables, bolts and gaskets in ABAQUS software, and then overlapping the ends of multi-section U-shaped steel beams and pre-tightening and fixing them with cable bolts to form a three-dimensional U-shaped steel bracket solid model, the model can be made more in line with the actual stress conditions of the U-shaped steel retractable bracket for mining.

[0060] As a specific embodiment, setting the material parameters of the finite element model of each of the components includes: setting the material parameters of the U-shaped steel, the cable, the bolt, and the gasket;

[0061] The material parameters of the U-shaped steel include elastic modulus, plasticity and density; wherein the plasticity parameter part selects the plastic strain hardening constitutive model. The material parameters of the cable, bolt and gasket include elastic modulus, density, Poisson's ratio and other parameters. Figure 4 As shown, Figure 4 It is a schematic diagram of the interface for setting the U-shaped steel material parameters in the ABAQUS software in this embodiment.

[0062] As a specific embodiment, the contact relationship and the mechanical constraint relationship in the support structure are determined, and the specific setting method includes:

[0063] (1) Establish the contact relationship between the contact surfaces of adjacent model components:

[0064] In the contact between U-shaped steels, the contact surface of the U-shaped steel of the shed legs is determined as the main surface, and the contact surface of the U-shaped steel of the shed roof is determined as the secondary surface;

[0065] In the contact between the bolt and the cable, select the contact surface of the cable as the primary surface and the contact surface of the bolt as the secondary surface. In particular, in the contact between the bolt cylinder surface and the cable slot surface, it is necessary to set the automatic smoothing 3D geometric surface.

[0066] In the contact between the cable and the U-shaped steel, the U-shaped steel contact surface is selected as the primary surface, and the cable contact surface is selected as the secondary surface. Due to the overlap structure, there is a gap between the primary and secondary surfaces. In the secondary node / surface adjustment, a tolerance of 0.02mm is specified to ensure stable contact.

[0067] (2) Determine the mechanical constraint relationship of the above three contact pairs, select the penalty contact method, and set the slip relationship to finite slip.

[0068] (3) Define the interaction properties, select the penalty friction formula, set the fixed friction coefficient, and the normal behavior is "hard" contact.

[0069] (4) A binding constraint is set on the contact surface between the U-shaped steel of the shed leg and the gasket: that is, the gasket and the bottom of the U-shaped steel of the shed leg are actually welded and fixed, and there is no relative sliding between the two.

[0070] By defining the contact surfaces and the corresponding load and deformation transfer relationships, the interaction relationship between model components is set up, and the contact relationship and interaction relationship between components that conform to the actual situation are established. This can more realistically restore the stress conditions of the U-shaped steel retractable bracket in the actual overlap, making the subsequent mechanical response more accurate.

[0071] As a preferred embodiment, in step S102, a static analysis is performed on the finite element model of the U-shaped steel bracket to obtain a static analysis result, including:

[0072] According to the U-shaped steel bracket finite element model, setting the model static analysis parameters;

[0073] The U-shaped steel bracket finite element model is subjected to static analysis according to the static analysis parameters of the model to obtain a static analysis result.

[0074] By performing static analysis on the finite element model of the U-shaped steel support, the mechanical response of the U-shaped steel support for mining in the overlap stage is simulated. In practice, the U-shaped steel support is fixed by bolts and cables. By setting the static analysis parameters, the corresponding mechanical conditions and parameters can be input according to the actual working conditions, so that the force response of the model is more in line with the actual situation.

[0075] As a preferred embodiment, according to the U-shaped steel bracket finite element model, the model static analysis parameters are set, including:

[0076] The static load conditions and static boundary conditions of the U-shaped steel bracket finite element model are set.

[0077] The static load of the U-shaped steel support for mining mainly includes the cable clamp, bolt preload, and U-shaped steel support gravity. In order to simulate the stress condition of the U-shaped steel support for mining when it is overlapped, as a specific embodiment, the specific steps of setting the static load conditions of the finite element model of the U-shaped steel support include:

[0078] Select the bolt load mechanics type that comes with Abaqus, select the inner surface of the bolt as the load-bearing surface, apply a force of 10N in the analysis step step-1, first establish stability, then set the required preload force of 37880N in step-2, and select the fixed current length in the step-3 method, and complete the loading of the bolt preload force through the first three steps. At the same time, in order to enhance the stability of the bracket structure, establish gravity in step-1 and apply it to the entire model, with a value of -9800mm / s 2 .

[0079] In order to simulate the motion constraint situation when the U-shaped steel support for mining is overlapped, as a specific embodiment, the specific steps of setting the static boundary conditions of the finite element model of the U-shaped steel support include:

[0080] The bases of the two side legs and the gaskets are completely fixed and constrained, thus constraining their 6 degrees of freedom; the Z plane degrees of freedom of the U-shaped steel bracket and the cable are constrained, that is, they cannot move outside the plane; at the same time, the local coordinates of the bolts are set so that the bolts only have the degree of freedom in the y-axis direction. The schematic diagram of the static boundary conditions of the finite element model of the U-shaped steel bracket is shown in the figure. Figure 5 shown.

[0081] As a preferred embodiment, a static analysis is performed on the finite element model of the U-shaped steel bracket according to the static analysis parameters of the model to obtain a static analysis result, including:

[0082] Meshing the finite element model of the U-shaped steel bracket after the static analysis parameters are set;

[0083] A static analysis is performed on the meshed U-shaped steel bracket finite element model to obtain a static analysis result.

[0084] Based on the principle of finite element simulation method, the model is divided into a finite number of sub-regions with certain attributes for solving, which can reduce the simulation time cost and improve the accuracy of the simulation. As a specific embodiment, the meshing of the finite element model of the U-shaped steel bracket includes:

[0085] The mesh of the U-shaped steel top beam components at the contact parts on both sides is divided into fine parts, and the approximate size of the unit surface is 5mm×10mm. The mesh of the non-contact parts adopts single precision offset, and the size gradually increases from 20mm on both sides to 45mm in the middle; the mesh of the U-shaped steel shed legs at the contact parts is 8mm×20mm, and the mesh size of the non-contact parts is offset by single precision from 20mm to 45mm at the bottom of the shed legs; the approximate size of the unit surface of the cable and bolt components is 8mm×8mm.

[0086] The local mesh seeding method is used to adjust and optimize the mesh quality. The component mesh unit type is set to the standard unit library type, the geometric order is linear, the hexahedron reduced integration is selected, and the unit type is C3D8R to complete the meshing of the mining U-shaped steel support model.

[0087] As a specific embodiment, the static analysis of the U-shaped steel bracket is performed using the static analysis module of the ABAQUS software. The operating parameters of the static analysis module of the ABAQUS software need to be set:

[0088] (1) Set the static general analysis step parameters, that is, set the ABAQUS / Standard (static general analysis step) parameters and set the incremental step size reasonably.

[0089] (2) Check the required field output variables and history output variables. ABAQUS can set the calculation result items required for simulation analysis in the analysis step module, which are mainly divided into field output variables and history output variables. Among them, field variable output is used to describe the change of a certain quantity with spatial position, and history variables are used to describe the change of a certain quantity with time. The static analysis results of this embodiment mainly focus on the stress, strain and displacement of the model structure.

[0090] After the operating parameters of the above static analysis module are set, the U-shaped steel bracket finite element model with the static analysis parameters set and the mesh divided is input into the static analysis module, i.e., ABAQUS / Standard solver. The static analysis results obtained through software calculation processing are as follows: The static analysis Mises cloud diagram of the U-shaped steel bracket finite element model is as follows: Figure 6 shown.

[0091] As a preferred embodiment, in step S103, according to the static analysis result, a dynamic analysis is performed on the finite element model of the U-shaped steel bracket, including:

[0092] Using the static analysis results as the initial stress field, the dynamic analysis module of the ABAQUS software is set;

[0093] Setting dynamic analysis parameters for the finite element model of the U-shaped steel bracket;

[0094] A dynamic analysis is performed on the finite element model of the U-shaped steel bracket according to the dynamic analysis parameters.

[0095] By performing dynamic analysis on the finite element model of the U-shaped steel bracket, various mechanical response characteristics of the U-shaped steel bracket under different surrounding rock load conditions in practice are simulated.

[0096] Since the static analysis parameters set in the static analysis can only be set in the ABAQUS static analysis module, and the static parameters cannot be directly established in the ABAQUS dynamic analysis module, it is necessary to transfer the static analysis results in the ABAQUS static analysis module (ABAQUS / Standard) to the ABAQUS dynamic analysis module (ABAQUS / Explicit) through the data transfer function. As a specific embodiment, the static analysis results are used as the initial stress field to set the ABAQUS software dynamic analysis module, including:

[0097] Through the data transfer function, the static analysis results of the U-shaped steel bracket finite element model are used as the initial stress field and transferred to the ABAQUS / Explicit solver. The ABAQUS / Explicit solver is used to perform a quasi-static analysis of the U-shaped steel bracket stress in a display dynamic analysis step, which can reduce the software calculation cost and effectively save calculation time.

[0098] As a preferred embodiment, the setting of dynamic analysis parameters of the U-shaped steel bracket finite element model includes:

[0099] The dynamic load and dynamic boundary conditions are set for the U-shaped steel bracket structure model.

[0100] In order to simulate the stress condition of the U-shaped steel support under different surrounding rock load conditions, as a specific embodiment, the dynamic load setting of the U-shaped steel support structure model includes:

[0101] Apply external loads to the finite element model of the U-shaped steel bracket, such as Figure 7 As shown, Figure 7 This is the case where a uniformly distributed load is applied to the entire finite element model of the U-shaped steel bracket. In order to study the mechanical response behavior of the bearing capacity of different parts of the bracket, different loads can also be applied to different parts.

[0102] In order to simulate the spatial constraints of the U-shaped steel bracket, as a specific embodiment, the degrees of freedom of the finite element model of the U-shaped steel bracket outside the plane are constrained.

[0103] As a specific embodiment, performing a quasi-static analysis in a dynamic analysis on the finite element model of the U-shaped steel bracket according to the dynamic analysis parameters includes:

[0104] Set the operating parameters of the ABAQUS software dynamic analysis module;

[0105] The quasi-static analysis in the dynamic analysis of the finite element model of the U-shaped steel bracket is performed using the dynamic analysis module of the ABAQUS software after the setting is completed, and the simulation result of the mechanical response characteristics of the U-shaped steel bracket is obtained.

[0106] As a specific embodiment, setting the operating parameters of the ABAQUS software dynamic analysis module includes:

[0107] The display dynamic analysis step of ABAQUS software was established, and the interaction between the original contact surface and the new contact surface in the static analysis was set as general contact. Among them, the new contact surface refers to the new contact surface generated by the change of the contact surface when the U-shaped steel bracket is subjected to force and the sliding occurs at the overlap.

[0108] The action time of the display analysis step is determined by modal analysis. The lowest modal frequency of the U-shaped steel bracket finite element model is solved and substituted into the quasi-static analysis formula in Abaqus to obtain the time required for quasi-static analysis. The quasi-static analysis formula is:

[0109]

[0110] In the formula, f 1st is the lowest modal frequency of the model structure.

[0111] In the process output manager of the ABAQUS software dynamic analysis module, select ALLKE (kinetic energy) and ALLIE (internal energy) as output variables.

[0112] After the settings are completed, the ABAQUS / Explicit solver is used to perform mechanical analysis on the finite element model of the U-shaped steel bracket. Figure 8 As shown, Figure 8 It is the Mises stress cloud diagram and displacement cloud diagram of the finite element model of the U-shaped steel bracket under the overall uniformly distributed load, and simulates the bearing capacity and failure characteristics of the U-shaped steel bracket under the overall uniformly distributed load condition.

[0113] As a preferred embodiment, the load-bearing capacity and failure characteristics of different parts of the stent and the shrinkage characteristics of the overlapping parts and their influence on the mechanical response behavior of the stent can be further analyzed.

[0114] Combine the following Fig. 9 The specific operation method of numerical simulation of mechanical response behavior of U-shaped steel retractable support for mining using ABAQUS is described. The operation method includes:

[0115] Step S901: using ABAQUS to establish finite element models of U-shaped steel multi-section beams, cables, bolts, gaskets and other components;

[0116] Step S902: defining the properties of the finite element model of each component, including material settings, etc.;

[0117] Step S903: Establish a finite element model of a U-shaped steel retractable support; assemble the various components into a support as a whole by translation, rotation, etc., and set contact relationships and mechanical constraint relationships to obtain a finite element model of a U-shaped steel retractable support for mining;

[0118] Step S904: Establish ABAQUS / Standard static general analysis step;

[0119] Step S905: defining static loads, static constraints and contact boundaries, and selecting appropriate units to mesh the finite element model of the U-shaped steel bracket;

[0120] Step S906: Perform static analysis on the U-shaped steel support model to simulate the sliding and shrinking behavior of the overlapped parts of the mining U-shaped steel support, and quantitatively study the shrinking characteristics of the overlapped parts and their influence on the mechanical response behaviors such as the bearing capacity and deformation characteristics of different parts of the support;

[0121] Step S907: Determine whether the model is correct; determining whether the model is correct means determining whether the calculation results of the software are converged. If the calculation results are incorrect, the model needs to be adjusted until the calculation converges. Therefore, if the model is correct, proceed to step S908; if the model is incorrect, return to step S905 and re-adjust the bolt preload, contact surface, mesh division, etc.

[0122] Step S908: outputting the static analysis results; mainly outputting the stress, strain and displacement of the model structure under the static analysis conditions;

[0123] Step S909: Establish ABAQUS / Explicit to display the dynamic analysis step, and use the static analysis results as the initial stress field;

[0124] Step S910: defining the surrounding rock load, dynamic constraint conditions and contact boundary of the U-shaped steel support;

[0125] Step S911: performing a dynamic analysis on the U-shaped steel support model, and simulating the mechanical response behavior of the U-shaped steel support under different surrounding rock load conditions;

[0126] Step S912: Determine whether the model is correct. If the calculation result converges, the model is correct and the process goes to step S913. If the model is incorrect, the process goes back to step S910 to adjust the relevant parameters.

[0127] Step S913: output the complete mechanical response characteristic simulation results of the U-shaped steel bracket.

[0128] Through the above method, the simulation and calculation capabilities of ABAQUS software can be maximized, and the simulation process of the three-dimensional finite element model of the U-shaped steel support for mining can be completed at a relatively low computing cost. Accurate simulation results can be obtained, and the bearing capacity and failure characteristics of different parts of the support, as well as the shrinkage characteristics of the overlapped parts and their influence on the mechanical response behavior of the support can be analyzed.

[0129] The embodiment of the present invention also provides a U-shaped steel bracket mechanical response characteristic simulation device, the structure block diagram of which is as follows: Fig.10 As shown, the U-shaped steel bracket mechanical response characteristic simulation device 1000 comprises:

[0130] A model building module 1001 is used to build a finite element model of the U-shaped steel bracket;

[0131] A static analysis module 1002 is used to perform a static analysis on the finite element model of the U-shaped steel bracket to obtain a static analysis result;

[0132] The dynamic analysis module 1003 is used to perform a dynamic analysis on the finite element model of the U-shaped steel bracket according to the static analysis result, so as to obtain a simulation result of the mechanical response characteristics of the U-shaped steel bracket.

[0133] like Fig.11 As shown, this embodiment further provides an electronic device 1100 , which may be a computing device such as a mobile terminal, a desktop computer, a notebook, a palmtop computer, a server, etc. The electronic device includes a processor 1101 , a memory 1102 , and a display 1103 .

[0134] In some embodiments, the memory 1102 may be an internal storage unit of a computer device, such as a hard disk or memory of a computer device. In other embodiments, the memory 1102 may also be an external storage device of a computer device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), etc. equipped on the computer device. Further, the memory 1102 may also include both an internal storage unit of a computer device and an external storage device. The memory 1102 is used to store application software and various types of data installed on the computer device, such as program codes for installing the computer device. The memory 1102 may also be used to temporarily store data that has been output or is to be output. In one embodiment, a U-shaped steel bracket mechanical response characteristic simulation method program 1104 is stored on the memory 1102, and the U-shaped steel bracket mechanical response characteristic simulation method program 1104 can be executed by the processor 1101, thereby realizing a U-shaped steel bracket mechanical response characteristic simulation method of each embodiment of the present invention.

[0135] In some embodiments, the processor 1101 may be a central processing unit (CPU), a microprocessor or other data processing chip, used to run program codes or process data stored in the memory 1102, such as executing a method program for simulating the mechanical response characteristics of a U-shaped steel bracket.

[0136] In some embodiments, the display 1103 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, etc. The display 1103 is used to display information on the computer device and to display a visual user interface. The components 1101-1103 of the computer device communicate with each other through a system bus.

[0137] This embodiment also provides a computer-readable storage medium, wherein the program medium stores computer program instructions. When the computer program instructions are executed by a computer, the computer executes the method for simulating the mechanical response characteristics of a U-shaped steel bracket as described in any of the above technical solutions.

[0138] This embodiment also provides a computer-readable storage medium, on which is stored a program for a method for simulating the mechanical response characteristics of a U-shaped steel bracket. When a processor executes the program, the method for simulating the mechanical response characteristics of a U-shaped steel bracket as described above is implemented.

[0139] The computer-readable storage medium and computing device provided according to the above-mentioned embodiments of the present invention can be implemented with reference to the specific description of the method for simulating the mechanical response characteristics of a U-shaped steel bracket as described above according to the present invention, and have similar beneficial effects as the method for simulating the mechanical response characteristics of a U-shaped steel bracket as described above, which will not be repeated here.

[0140] The present invention discloses a method, device, electronic device and computer-readable storage medium for simulating the mechanical response characteristics of a U-shaped steel bracket. First, a finite element model of the U-shaped steel bracket is established; secondly, a static analysis is performed on the finite element model of the U-shaped steel bracket to obtain a static analysis result; finally, based on the static analysis result, a dynamic analysis is performed on the finite element model of the U-shaped steel bracket to obtain a simulation result of the mechanical response characteristics of the U-shaped steel bracket.

[0141] The present invention establishes a finite element model of a U-shaped steel bracket so that the entity model is more in line with the actual situation of engineering application; by performing static analysis on the finite element model of the U-shaped steel bracket, the sliding shrinkage behavior of the overlapped part of the U-shaped steel bracket for mining is truly and objectively reflected, and the shrinkage characteristics of the overlapped part and its influence on the mechanical response behaviors such as the bearing capacity and deformation characteristics of different parts of the bracket can be quantitatively studied; at the same time, based on the static analysis results, the finite element model of the U-shaped steel bracket is dynamically analyzed, and different external load conditions such as pressure, tension and torsion can be set to truly reflect the actual stress states such as bending, torsion, tension shear and compression shear of the U-shaped steel bracket for mining, and objectively invert the three-dimensional mechanical response characteristics of the U-shaped steel bracket for mining under different external loads. The present invention can objectively and truly simulate the mechanical response behavior of the U-shaped steel bracket for mining, and provide theoretical guidance for engineering practice.

[0142] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for simulating the mechanical response characteristics of a U-shaped steel bracket, characterized in that: include: Establish the finite element model of the U-shaped steel bracket; Performing static analysis on the finite element model of the U-shaped steel bracket to obtain static analysis results; According to the static analysis results, a dynamic analysis is performed on the finite element model of the U-shaped steel bracket to obtain a simulation result of the mechanical response characteristics of the U-shaped steel bracket; Establish the finite element model of the U-shaped steel bracket, including: Establish the finite element model of each component of the U-shaped steel bracket; Set the material parameters of the finite element model of each component; The finite element models of the various components are combined into a support body, and the contact relationship and constraint relationship in the support body are determined to obtain a finite element model of the U-shaped steel bracket; Determine the contact relationship and mechanical constraint relationship in the support as a whole, and the specific setting method includes: (1) Establish the contact relationship between the contact surfaces of adjacent model components: in the contact between U-shaped steel and U-shaped steel, determine the contact surface of the U-shaped steel of the shed leg as the main surface, and the contact surface of the U-shaped steel of the shed roof as the secondary surface; in the contact between the bolt and the cable, select the contact surface of the cable as the main surface, and the contact surface of the bolt as the secondary surface; in the contact between the cable and the U-shaped steel, select the contact surface of the U-shaped steel as the main surface, and the contact surface of the cable as the secondary surface; (2) Determine the mechanical constraint relationship of the above three contact pairs, select the penalty contact method, and set the slip relationship to finite slip; (3) Define the interaction properties, select the penalty friction formula, set a fixed friction coefficient, and set the normal behavior to "hard" contact; (4) A binding constraint is set on the contact surface between the U-shaped steel of the shed leg and the gasket: that is, the gasket and the bottom of the U-shaped steel of the shed leg are actually welded and fixed, and there is no relative sliding between the two.

2. The method for simulating mechanical response characteristics of a U-shaped steel bracket according to claim 1 is characterized in that: The U-shaped steel bracket finite element model is subjected to static analysis to obtain static analysis results, including: According to the U-shaped steel bracket finite element model, setting the model static analysis parameters; The U-shaped steel bracket finite element model is subjected to static analysis according to the static analysis parameters of the model to obtain a static analysis result.

3. The method for simulating mechanical response characteristics of a U-shaped steel bracket according to claim 2 is characterized in that: According to the U-shaped steel bracket finite element model, the model static analysis parameters are set, including: The static load and static boundary conditions applied to the U-shaped steel bracket finite element model are set.

4. The method for simulating mechanical response characteristics of a U-shaped steel bracket according to claim 3 is characterized in that: The U-shaped steel bracket finite element model is subjected to static analysis according to the model static analysis parameters to obtain static analysis results, including: Meshing the finite element model of the U-shaped steel bracket after the static analysis parameters are set; A static analysis is performed on the meshed U-shaped steel bracket finite element model to obtain a static analysis result.

5. The method for simulating mechanical response characteristics of a U-shaped steel bracket according to claim 1, characterized in that: According to the static analysis results, a dynamic analysis is performed on the finite element model of the U-shaped steel bracket, including: Setting dynamic analysis parameters for the finite element model of the U-shaped steel bracket; A dynamic analysis is performed on the finite element model of the U-shaped steel bracket according to the dynamic analysis parameters.

6. The method for simulating mechanical response characteristics of a U-shaped steel bracket according to claim 5, characterized in that: The dynamic analysis parameters of the U-shaped steel bracket finite element model are set, including: The dynamic load and dynamic boundary conditions are set for the U-shaped steel bracket structure model.

7. A U-shaped steel bracket mechanical response characteristics simulation device, characterized in that: include: Model building module, used to build the finite element model of the U-shaped steel bracket; A static analysis module, used to perform static analysis on the finite element model of the U-shaped steel bracket to obtain a static analysis result; A dynamic analysis module, used to perform a dynamic analysis on the finite element model of the U-shaped steel bracket according to the static analysis result, and obtain a simulation result of the mechanical response characteristics of the U-shaped steel bracket; Establish the finite element model of the U-shaped steel bracket, including: Establish the finite element model of each component of the U-shaped steel bracket; Set the material parameters of the finite element model of each component; The finite element models of the various components are combined into a support body, and the contact relationship and constraint relationship in the support body are determined to obtain a finite element model of the U-shaped steel bracket; Determine the contact relationship and mechanical constraint relationship in the support as a whole, and the specific setting method includes: (1) Establish the contact relationship between the contact surfaces of adjacent model components: in the contact between U-shaped steel and U-shaped steel, determine the contact surface of the U-shaped steel of the shed leg as the main surface, and the contact surface of the U-shaped steel of the shed roof as the secondary surface; in the contact between the bolt and the cable, select the contact surface of the cable as the main surface, and the contact surface of the bolt as the secondary surface; in the contact between the cable and the U-shaped steel, select the contact surface of the U-shaped steel as the main surface, and the contact surface of the cable as the secondary surface; (2) Determine the mechanical constraint relationship of the above three contact pairs, select the penalty contact method, and set the slip relationship to finite slip; (3) Define the interaction properties, select the penalty friction formula, set a fixed friction coefficient, and set the normal behavior to "hard" contact; (4) A binding constraint is set on the contact surface between the U-shaped steel of the shed leg and the gasket: that is, the gasket and the bottom of the U-shaped steel of the shed leg are actually welded and fixed, and there is no relative sliding between the two.

8. An electronic device, characterized in that: It comprises a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method for simulating the mechanical response characteristics of a U-shaped steel bracket as described in any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, the method for simulating the mechanical response characteristics of a U-shaped steel bracket as described in any one of claims 1-6 is implemented.

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