CN117454542A - Combined numerical simulation method, equipment and medium for angle steel component unit of power transmission line - Google Patents
Combined numerical simulation method, equipment and medium for angle steel component unit of power transmission line Download PDFInfo
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Abstract
The invention provides a combined numerical simulation method, equipment and medium for angle steel member units of a power transmission line, wherein the method comprises the following steps: respectively carrying out corrosion parameter analysis on a direct stress section and a bearing section of the angle steel member, assigning sections for the direct stress section and the bearing section, establishing a model of each part in the angle steel member, and assembling each part into an example model; wherein, the shell unit is selected for carrying out model establishment on the bearing section, and the entity unit is selected for carrying out model establishment on the direct stress section; performing characteristic value buckling analysis on the example model to obtain buckling modes of the example model, and updating the example model to obtain a finite element model of the angle steel member; and carrying out nonlinear analysis on the finite element model of the angle steel member to obtain a displacement cloud picture, a stress cloud picture and a strain cloud picture in the analysis result of the finite element model. The device and the medium are used to execute and store, respectively, a computer program enabling the implementation of the above-mentioned method. The test cost can be greatly reduced, and the mechanical property of the corrosion steel can be effectively predicted.
Description
Technical Field
The invention relates to the technical field of mechanical property analysis of angle steel components of power transmission lines, in particular to a combined numerical simulation method, equipment and medium for angle steel components of power transmission lines.
Background
Steel rust is one of the main forms of durability degradation of steel structures, and the damage caused by the rust is not ignored. Especially for the angle steel member applied to the power transmission line, due to the operation characteristics and the severe operation environment conditions, the corrosion of the angle steel member which cannot be timely protected is gradually aggravated along with the continuous extension of the service time of the steel structure, the stress performance of steel is further damaged, and the bearing capacity of the steel structure is reduced, so that the steel structure is prematurely lost in normal use, the safety and reliability of the power transmission system are influenced, and even the life and property safety of a user is endangered.
In order to better understand and control steel corrosion, a nonlinear numerical simulation technology of angle steel components is adopted, wherein the section corrosion defects are considered, namely, the mechanical properties and rules of the corrosion steel under different stress conditions are visually presented through the nonlinear numerical simulation technology. The nonlinear numerical simulation technology of the angle steel component considering the section corrosion defect combines the mechanical property data of the actual corrosion steel test with a calculation program, thereby constructing a complete corrosion steel mechanical property model. By the numerical simulation technology, key mechanical performance indexes such as stress, strain and displacement of the rusted steel under different loads can be predicted, so that accidents caused by corrosion of steel structure buildings can be better prevented. The nonlinear numerical simulation technology of the angle steel member considering the section corrosion defect needs to adopt a certain modeling method and algorithm, the existing nonlinear numerical simulation technology of the angle steel member lacks consideration of the section corrosion defect of the angle steel member, has complicated data input, causes inconvenience for later research, and has low data processing efficiency and poor prediction precision.
Disclosure of Invention
The invention aims to at least solve one of the technical problems of lack of consideration on the corrosion defect of the section of the angle steel member, complex data input, low data processing efficiency and poor prediction precision in the prior art.
Therefore, the first aspect of the invention provides a combined numerical simulation method for the angle steel component unit of the power transmission line.
A second aspect of the invention provides a computer device.
A third aspect of the present invention provides a computer-readable storage medium.
The invention provides a combined numerical simulation method for angle steel component units of a power transmission line, which comprises the following steps:
dividing the component parts of the angle steel member into a direct stress section and a bearing section according to the stress characteristic of the angle steel member, respectively carrying out corrosion parameter analysis on the direct stress section and the bearing section, respectively assigning sections for the direct stress section and the bearing section according to the corrosion parameter analysis result, establishing a model of each part in the angle steel member, and assembling each part into an example model; wherein, the shell unit is selected for carrying out model establishment on the bearing section, and the entity unit is selected for carrying out model establishment on the direct stress section;
performing eigenvalue buckling analysis on the example model to obtain buckling modes of the example model, wherein the obtained buckling modes are defined as set geometric defects, the set geometric defects, initial geometric defects and residual stress are introduced into the example model, and the example model is updated to obtain a finite element model of the angle steel member, wherein the initial geometric defects comprise inherent defects of the angle steel member caused by non-operation reasons;
and carrying out nonlinear analysis on the finite element model of the angle steel member to obtain a displacement cloud picture, a stress cloud picture and a strain cloud picture in the analysis result of the finite element model.
According to the technical scheme, the combined numerical simulation method for the angle steel component unit of the power transmission line can also have the following additional technical characteristics:
in the above technical scheme, the direct stress section is arranged in a region at the end part of the angle steel member for connecting an external member, and the bearing section is arranged in the middle part of the angle steel member;
when a model of the direct stress section is established according to the analysis result of the corrosion parameters, simulating the corrosion condition of the direct stress section by utilizing the entity unit according to the corrosion type of the direct stress section;
when a model of the bearing section is established according to the analysis result of the corrosion parameters, the bearing section is divided into a plurality of sections, and the thickness of the shell of each section is defined according to the analysis result of the corrosion parameters.
In the above technical solution, the building a model of each component in the angle steel member, assembling each component as an example model, includes:
selecting a shell unit as a unit type of a bearing section, selecting a solid unit as a unit type of a direct stress section, and creating a model of each component according to the geometric dimensions of the direct stress section and the bearing section;
assigning sections for the direct stress section and the bearing section according to the analysis result of the corrosion parameters, and defining the sections and the shell offset direction of the angle steel member through section assignment; and
assigning a material texture to the model of each component;
setting the shape of a unit, the type of grid and the size of seeds, and carrying out grid division on the model of each part;
the components were assembled as an example model.
In the above technical solution, the building a model of each component in the angle steel member, assigning a section and a material structure to the model of each component, and assembling each component as an example model, further includes:
boundary conditions are applied to the example model, and interactions and constraints between components are created, namely, the components are assembled to specified positions according to set position constraints.
In the above technical solution, performing eigenvalue buckling analysis on the example model to obtain a buckling mode of the example model, where the obtained buckling mode is defined as a set geometric defect, introducing the set geometric defect, an initial geometric defect and residual stress into the example model, and updating the example model to obtain a finite element model of the angle steel member, including:
replicating instance models, at least one instance model being defined as a first instance model, at least one instance model being defined as a second instance model;
performing characteristic value buckling analysis on the first instance model by adopting a subspace solver, applying unit concentrated force to the first instance model, recording node coordinates of the first instance model, and submitting analysis to obtain buckling modes of the first instance model;
and taking the characteristic value of the buckling mode of the first example model as the load size, applying concentrated force for the second example model to update the second example model, introducing initial geometric defects and residual stress to update the second example model, and taking the updated second example model as a finite element model of the angle steel member.
In the above technical solution, introducing residual stress to update the second example model includes:
defining a predefined field through an Initial analysis step, and applying residual stress along the longitudinal direction of the angle steel to the angle steel through the predefined field.
In the above technical solution, the nonlinear analysis of the finite element model of the diagonal steel member includes:
loading the finite element model of the angle steel member, and applying a bolt load to a connecting node on the direct stress section;
adjusting the application mode of the bolt load to be fixed at the current length, adjusting the boundary condition of the reference point, and applying displacement load to the finite element model of the angle steel member;
wherein the reference point is the load action point of the finite element model.
In the above technical solution, further includes:
and comparing and analyzing the finite element model analysis result according to the existing test result, and verifying the accuracy of the finite element model analysis result.
The invention also provides computer equipment, which comprises a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to realize the combined numerical simulation method of the angle steel component unit of the power transmission line according to any one of the technical schemes.
The invention also provides a computer readable storage medium, wherein the storage medium stores a computer program, and the computer program is loaded and executed by a processor to realize the combined numerical simulation method of the angle steel component unit of the power transmission line according to any one of the technical schemes.
In summary, due to the adoption of the technical characteristics, the invention has the beneficial effects that:
the invention provides a nonlinear numerical simulation method of an angle steel member considering section corrosion defects. The method has the advantages that key mechanical performance indexes of the components are determined based on a finite element analysis technology, corrosion parameter analysis is firstly carried out on the components, modeling parameters are determined by combining the geometric dimensions of the angle steel components, and then a model is constructed in a form of a combination of a solid body and a shell. And finally, comparing the analysis result with test data, and comparing the result shows that the key mechanical property index and the test compliance obtained by the method are high compared with the traditional method based on engineering experience, and the method can greatly reduce the test cost and effectively predict the mechanical property of the corrosion steel.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a flowchart of a combined numerical simulation method of a power transmission line angle steel member unit according to an embodiment of the present invention;
fig. 2 is a flowchart of a second example model establishment in a transmission line angle steel member unit combined numerical simulation method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an equilateral angle steel test piece in a combined numerical simulation method of angle steel members of a power transmission line according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a single-limb compression example model in a combined numerical simulation method of a power transmission line angle steel member unit according to an embodiment of the present invention;
FIG. 5 is a residual stress diagram of a single limb compression example model in a transmission line angle steel member unit combination type numerical simulation method according to an embodiment of the present invention;
FIG. 6 is a displacement and stress cloud diagram of a finite element model in a combined numerical simulation method of angle steel members of a power transmission line according to an embodiment of the present invention;
fig. 7 is a graph showing a comparison of a mid-span displacement-load curve analysis of a test result of a known angle steel test piece and a finite element analysis result in a combined numerical simulation method of an angle steel member unit of a power transmission line according to an embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
The following describes a transmission line angle steel member unit combination type numerical simulation method, apparatus and medium according to some embodiments of the present invention with reference to fig. 1 to 7.
Some embodiments of the application provide a power transmission line angle steel member unit combined numerical simulation method.
As shown in fig. 1, a first embodiment of the present invention provides a power transmission line angle steel member unit combination type numerical simulation method, which uses general finite element analysis software to construct a finite element model of an angle steel member, and comprehensively considers factors such as material nonlinearity, geometric nonlinearity, initial bending, residual stress, etc. in the finite element model, and researches mechanical properties of the angle steel member after corrosion damage at different positions, and specifically includes:
according to the stress characteristics of the angle steel member, the component parts of the angle steel member are divided into a direct stress section and a bearing section, in some embodiments, the angle steel member comprises an angle steel main body and connecting limbs, wherein the connecting limbs are arranged at two ends of the angle steel member, screw holes are formed in the connecting limbs and are used for fixedly connecting with external members, and the connecting limbs are used for establishing connection and have the characteristic of direct stress, so that the connecting limbs are defined as the direct stress section; the angle steel main body is arranged in the middle of the angle steel member, namely, between two connecting limbs, and the bearing force on the connecting limbs is transferred to the angle steel main body, so that the angle steel main body is defined as a bearing section, and screw holes and bolt positions on the connecting limbs are defined as connecting nodes of the connecting limbs; it can be appreciated that the direct force bearing section and the load bearing section can still be divided according to the force bearing characteristics by adopting different angle steel members. And respectively carrying out corrosion parameter analysis on the direct stress section and the bearing section, wherein the purpose of the corrosion parameter analysis is to provide modeling parameters related to section corrosion defects for a subsequent modeling process, specifically, the corrosion type of the direct stress section comprises bolt aperture corrosion and local corrosion of connecting limbs, the corrosion type of the bearing section comprises angle steel main body corrosion, and the corrosion parameters represent corrosion positions and corrosion degrees of the direct stress section and the bearing section.
Then, respectively assigning sections for the direct stress section and the bearing section according to analysis results of corrosion parameters, establishing a model of each component in the angle steel member, and assembling each component into an example model; selecting proper unit types according to the geometric dimensions of each component to respectively establish a component model for the direct stress section and the bearing section, specifically, selecting a shell unit to establish a model for the bearing section, and selecting a solid unit to establish a model for the direct stress section; namely, in the established example model, the angle steel main body and the connecting limbs are connected in a mode that the shell units are connected with the entity units, so that the calculation accuracy can be greatly improved.
In some embodiments, when a model of the direct stress section is established according to the analysis result of the corrosion parameters, the corrosion condition of the direct stress section is simulated by using the entity unit according to the corrosion type and the corrosion condition of the direct stress section, and the simulation is specifically performed by assigning a section process; if a certain connecting limb is corroded by a plurality of bolt apertures, the corrosion and the corrosion degree are directly simulated by a physical unit to be a model of a direct stress section, so that eccentric and constraint effects of node connection and the corrosion effect of the connecting limb can be displayed in the physical model.
In some embodiments, when the load-bearing section is modeled according to the corrosion parameter analysis results, the load-bearing section is divided into a plurality of sections, and the shell thickness of each section is defined according to the corrosion parameter analysis results, i.e. a section is assigned to each section. Namely, different shell thicknesses are defined by dividing sections with different lengths, so that specific positions of corrosion on the angle steel main body are accurately simulated, and the situations of discontinuous corrosion and multipoint occurrence can be better dealt with. The corrosion effect of the angle steel main body can be displayed in the solid model. The method combines with the embodiment, greatly improves the efficiency and the speed of double nonlinear analysis (geometric nonlinearity and material nonlinearity) on the basis of ensuring the calculation precision, reduces the memory occupancy of a computer, and is very suitable for engineering design.
In building an example model, a model of each component is also assigned a material construct, specifying the material make-up and properties of each component. Selecting proper unit shape, grid type and seed size to divide the grid for the component; the components are then assembled into an example model.
In assembling the components into the instance model, boundary conditions should also be applied to the instance model in the Initial analysis step to create interactions and constraints between the components, i.e., to assemble the components to specified locations according to the set location constraints.
After obtaining an example model, performing eigenvalue buckling analysis on the example model to obtain a buckling mode of the example model, wherein the obtained buckling mode is defined as a set geometric defect, the set geometric defect, an initial geometric defect and residual stress are introduced into the example model, and the example model is updated to obtain a finite element model of the angle steel member, wherein the initial geometric defect comprises an inherent defect of the angle steel member caused by a non-operation reason, and it can be understood that the initial geometric defect can also comprise other geometric defects as required, so that the actual condition of the angle steel member is simulated; in some embodiments, the method specifically comprises the following steps:
replicating instance models, at least one instance model being defined as a first instance model, at least one instance model being defined as a second instance model; in particular, the first instance model may be renamed to an ideal model and the second instance model to a defect model.
Performing characteristic value buckling analysis on the first instance model by adopting a subspace solver, applying unit concentrated force to the first instance model, recording node coordinates of the first instance model, and submitting analysis to obtain buckling modes of the first instance model; in a specific embodiment, step-1 is created in a first instance model, namely an ideal model, a buckling analysis Step is selected, a subspace solver is adopted to conduct eigenvalue buckling analysis, a unit concentrated force is applied to the instance model by a load module, node coordinates of an instance are recorded by keywords of the ideal model, and buckling modes of the instance model are obtained by submitting analysis.
And taking the characteristic value of the buckling mode of the first example model as the load size, applying concentrated force for the second example model to update the second example model, introducing initial geometric defects and residual stress to update the second example model, and taking the updated second example model as a finite element model of the angle steel member. In a specific embodiment, step-1 is created in a second example model, namely a defect model, a static Riks analysis Step is selected, geometrical nonlinearity is opened, a characteristic value of a first-order buckling mode obtained in an ideal model analysis is taken as a load size to apply a concentration force to the example model, then a keyword of the model is edited to update the defect model, initial geometrical defects and residual stress are introduced, and creation of a finite element model of the angle steel member is completed. The process of establishing and updating the second instance model is shown in fig. 2.
In some embodiments, the component may advance into plasticity due to residual stress, thereby reducing the ultimate load bearing capacity of the component. Therefore, the influence of the residual stress on the mechanical property of the angle steel is considered in the finite element model, the residual stress coefficient of the equilateral angle steel accords with the specification of steel structural design standard GB 50017-2017 in China, and the residual stress of the angle steel component is considered by defining a predefined field in the model through an Initial analysis step, and applying the residual stress along the longitudinal direction of the angle steel to the angle steel through the predefined field.
And carrying out nonlinear analysis on the finite element model of the angle steel member to obtain a displacement cloud picture, a stress cloud picture and a strain cloud picture in the analysis result of the finite element model. The nonlinear analysis of the finite element model of the angle steel member specifically comprises:
loading the finite element model of the angle steel component, creating Step-1, selecting a static general analysis Step, opening geometric nonlinearity, and applying bolt load to the connecting nodes on the connecting limbs by the load module.
Creating Step-2, selecting a static general analysis Step, opening geometric nonlinearity, adjusting an application mode of a bolt load to be fixed at the current length, adjusting boundary conditions of a reference point, and applying a displacement load to a finite element model of the angle steel member; wherein the reference point is the load action point of the finite element model.
And finally, comparing and analyzing the finite element model analysis result according to the existing test result, and verifying the accuracy of the finite element model analysis result. In some embodiments, if the existing test results deviate more than 10% from the finite element model analysis results, the modeling process should be checked for modification, and in some embodiments, the model is modified by modifying the initial geometric defects and residual stresses, where the initial boundary conditions are applied to the example model. And if the accuracy and stability of the finite element analysis result can meet the requirements, ending the numerical simulation flow.
In one embodiment, numerical simulations were performed on a section angle corrosion member under single limb compressive loading. The angle steel member adopts an equilateral angle steel standard test piece as shown in figure 3, the sizes of the angle steel member are L75 multiplied by 6mm and L125 multiplied by 8mm, the lengths of the angle steel member are 1986mm and 1092mm, and the angle steel member is connected by 3 bolts in a single limb manner. And opening finite element software, wherein the angle steel main body adopts a shell unit, and the connecting limb adopts a C3D8R reduced integral entity unit. And when modeling, drawing the cross section size according to the actual size measured by the test component, generating the component through a stretching command, and defining the cross section and the shell offset direction of the angle steel component through the cross section assignment. The components are then assigned corresponding material constitutive relationships. Grid division is carried out on the modeling model, wherein all angle steels adopt quadrilateral free grids, global seeds are distributed, and the approximate global size is set to be 6mm; the connecting limbs adopt hexahedral structure grids, and finally the components are assembled to form an example model, namely the angle steel and the connecting limbs are assembled to a proper position through reasonable position constraint, as shown in fig. 4. Before the load is applied, boundary conditions need to be set on both ends of the component, specifically, boundary conditions need to be applied to the example model shown in fig. 4 in the Initial analysis step. The boundary conditions of the reference points RP-1, RP-2 are set to u1=u2=u3=0, ur2=ur3=0. The reference points RP-1 and RP-2 are the positions of the two ends of the angle steel member, namely the areas where the connecting limbs are located, U1, U2 and U3 are displacement distances of the reference points in the X, Y, Z direction respectively, and UR2 and UR3 represent torsion angles of the reference points around the Y axis and the Z axis respectively. Specifically, the reference point RP-1 is taken as a load action point of the model, and the interaction type between the angle steel and the connecting limb is defined as surface-to-surface contact.
The component may be brought into plasticity in advance due to residual stress, thereby reducing the ultimate bearing capacity of the component. Therefore, considering the influence of the residual stress on the mechanical property of the angle steel in the finite element model, the residual stress coefficient of the equilateral angle steel accords with the specification of steel structural design standard GB 50017-2017 in China, and considering the residual stress of the angle steel component requires defining a predefined field in the example model through an Initial analysis step, and applying the residual stress along the longitudinal direction of the angle steel to the angle steel through the predefined field, as shown in FIG. 5.
Then, loading the example model, creating Step-1, selecting a static general analysis Step, opening geometric nonlinearity, and applying a bolt load to the bolt at the load module. Creating Step-2, selecting a static general analysis Step, opening geometric nonlinearity, adjusting the application mode of the bolt load to be fixed at the current length, adjusting the boundary condition of a reference point, such as adjusting the value of U1, U2, U3, UR2 or UR3, and applying displacement load for the example. And finally creating a job and running finite element analysis.
And extracting key mechanical performance indexes such as a displacement cloud picture, a stress cloud picture, a strain cloud picture and the like from the finite element analysis result, wherein the key mechanical performance indexes are shown in figure 6. And comparing the finite element analysis result data with test data to prove the accuracy and stability of the finite element analysis result, wherein the comparison result of the finite element analysis result data and the test data established in the embodiment is shown in a figure 7, SC-H27.5-1, SC-H27.5-2 and SC-H27.5-3 are respectively mid-span displacement-load curves of three times of finite element analysis results, and FEM is a test result of a known angle steel test piece.
Further embodiments of the present invention provide a computer device, where the computer device includes a processor and a memory, where the memory stores a computer program, and the computer program is loaded and executed by the processor to implement the power transmission line angle steel component unit combined numerical simulation method according to any one of the foregoing embodiments.
Still further embodiments of the present invention provide a computer readable storage medium having a computer program stored therein, the computer program being loaded and executed by a processor to implement a power transmission line angle steel member unit combination type numerical simulation method according to any of the above embodiments.
In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a transmission line angle steel member unit combination formula numerical simulation method which characterized in that includes:
dividing the component parts of the angle steel member into a direct stress section and a bearing section according to the stress characteristic of the angle steel member, respectively carrying out corrosion parameter analysis on the direct stress section and the bearing section, respectively assigning sections for the direct stress section and the bearing section according to the corrosion parameter analysis result, establishing a model of each part in the angle steel member, and assembling each part into an example model; wherein, the shell unit is selected for carrying out model establishment on the bearing section, and the entity unit is selected for carrying out model establishment on the direct stress section;
performing eigenvalue buckling analysis on the example model to obtain buckling modes of the example model, wherein the obtained buckling modes are defined as set geometric defects, the set geometric defects, initial geometric defects and residual stress are introduced into the example model, and the example model is updated to obtain a finite element model of the angle steel member, wherein the initial geometric defects at least comprise inherent defects of the angle steel member caused by non-operation reasons;
and carrying out nonlinear analysis on the finite element model of the angle steel member to obtain a displacement cloud picture, a stress cloud picture and a strain cloud picture in the analysis result of the finite element model.
2. The power transmission line angle steel member unit combination type numerical simulation method according to claim 1, wherein the direct stress section is arranged in a region where the end part of the angle steel member is used for connecting an external member, and the bearing section is arranged in the middle of the angle steel member;
when a model of the direct stress section is established according to the analysis result of the corrosion parameters, simulating the corrosion condition of the direct stress section by utilizing the entity unit according to the corrosion type of the direct stress section;
when a model of the bearing section is established according to the analysis result of the corrosion parameters, the bearing section is divided into a plurality of sections, and the thickness of the shell of each section is defined according to the analysis result of the corrosion parameters.
3. The power transmission line angle steel member unit combination type numerical simulation method according to claim 2, wherein the modeling of each component in the angle steel member, assembling each component as an example model, comprises:
selecting a shell unit as a unit type of a bearing section, selecting a solid unit as a unit type of a direct stress section, and creating a model of each component according to the geometric dimensions of the direct stress section and the bearing section;
assigning sections for the direct stress section and the bearing section according to the analysis result of the corrosion parameters, and defining the sections and the shell offset direction of the angle steel member through section assignment; and
assigning a material texture to the model of each component;
setting the shape of a unit, the type of grid and the size of seeds, and carrying out grid division on the model of each part;
the components were assembled as an example model.
4. The power transmission line angle steel member unit combination type numerical simulation method according to claim 3, wherein the modeling of each component in the angle steel member, assembling each component as an example model, further comprises:
boundary conditions are applied to the example model, and interactions and constraints between components are created, namely, the components are assembled to specified positions according to set position constraints.
5. The method for combined numerical simulation of angle steel member units of electric transmission line according to claim 1, wherein the performing the eigenvalue buckling analysis on the example model to obtain a buckling mode of the example model, the obtained buckling mode being defined as a set geometric defect, introducing the set geometric defect, the initial geometric defect and the residual stress into the example model to update the example model to obtain a finite element model of the angle steel member, comprises:
replicating instance models, at least one instance model being defined as a first instance model, at least one instance model being defined as a second instance model;
performing characteristic value buckling analysis on the first instance model by adopting a subspace solver, applying unit concentrated force to the first instance model, recording node coordinates of the first instance model, and submitting analysis to obtain buckling modes of the first instance model;
and taking the characteristic value of the buckling mode of the first example model as the load size, applying concentrated force for the second example model to update the second example model, introducing initial geometric defects and residual stress to update the second example model, and taking the updated second example model as a finite element model of the angle steel member.
6. The power transmission line angle steel member unit combination type numerical simulation method according to claim 5, wherein the step of introducing residual stress to update the second example model includes:
defining a predefined field through an Initial analysis step, and applying residual stress along the longitudinal direction of the angle steel to the angle steel through the predefined field.
7. The power transmission line angle steel member unit combination type numerical simulation method according to claim 1, wherein the finite element model of the diagonal steel member performs nonlinear analysis, and the method comprises the following steps:
loading the finite element model of the angle steel member, and applying a bolt load to a connecting node on the direct stress section;
adjusting the application mode of the bolt load to be fixed at the current length, adjusting the boundary condition of the reference point, and applying displacement load to the finite element model of the angle steel member;
wherein the reference point is the load action point of the finite element model.
8. The transmission line angle steel member unit combination type numerical simulation method according to claim 1, further comprising:
and comparing and analyzing the finite element model analysis result according to the existing test result, and verifying the accuracy of the finite element model analysis result.
9. A computer device, characterized in that it comprises a processor and a memory in which a computer program is stored, which computer program is loaded and executed by the processor to implement the transmission line angle element unit combination numerical simulation method according to any one of claims 1 to 8.
10. A computer-readable storage medium, characterized in that the storage medium has stored therein a computer program that is loaded and executed by a processor to implement the transmission line angle steel member unit combination numerical simulation method according to any one of claims 1 to 8.
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