Rod piece nonlinear hysteresis constitutive model construction method, simulation method and system

Abstract

The invention provides a construction method, a simulation method and a system for a nonlinear hysteresis constitutive model of a rod piece. According to the scheme, the method comprises the following steps: acquiring hysteresis characteristics of rod pieces with different specifications; wherein the hysteresis characteristic is obtained based on a rod piece cyclic loading test; on the basis of the hysteretic characteristics of the rod piece and in combination with physical behaviors of the rod piece in different stress states, the stress-strain relation of the rod piece is divided into a tensile yield and strain hardening stage, a compressive buckling and post-buckling stage, a compressive unloading and tensile reloading stage and a compressive buckling bearing capacity degradation stage; on the basis of stage division of the stress-strain relationship of the rod piece, function representations corresponding to the stress-strain relationship of different stages are constructed; and based on the function representation of the stress-strain relationship corresponding to different stages, constructing a rod piece nonlinear hysteresis constitutive model, and based on the constructed rod piece nonlinear hysteresis constitutive model, carrying out simulation analysis on the rod piece and the power transmission tower.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power equipment, and in particular relates to a method for constructing a nonlinear hysteresis constitutive model of a rod, a simulation method and a system. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Transmission towers account for a large proportion of transmission lines. In the structural design of lattice towers, single limbs of equilateral rods are usually connected to adjacent components by welding or bolts. They are not axially compressed components in the traditional sense. Due to the constraints at both ends of the equilateral rods, the slenderness ratio and the degree of eccentricity, there are great differences in the calculation of the compressive bearing capacity of the rods. They exhibit complex hysteresis behavior under cyclic tension and compression loads, which has a great impact on the dynamic response of the rod tower. Therefore, accurately simulating the hysteresis behavior of rods is the key to studying the dynamic response and collapse damage of transmission towers under severe convective weather; the inventors found that the current research is mainly aimed at the cross-sections of steel components such as steel pipes, I-beams, channels or T-shaped steels. Due to the structural differences and hysteresis behaviors of these steel components and equilateral rods, the existing nonlinear constitutive models are not applicable to transmission tower rods. There is a lack of research on the hysteresis characteristics of equilateral rods. Summary of the invention

[0004] The embodiments of the present invention provide a method for constructing a nonlinear hysteretic constitutive model of a rod, a simulation method and a system to solve the problem that the existing nonlinear hysteretic constitutive model cannot truly present the physical characteristics of the rod under cyclic tension and compression loads, resulting in the inability to accurately predict the hysteretic behavior of the rod.

[0005] According to a first aspect of an embodiment of the present invention, a method for constructing a nonlinear hysteretic constitutive model of a rod is provided, comprising:

[0006] Acquiring hysteresis characteristics of rods of different specifications; wherein the hysteresis characteristics are obtained based on a cyclic loading test of the rod;

[0007] Based on the hysteresis characteristics of the rod and the physical behavior of the rod under different stress states, the stress-strain relationship of the rod is divided into the tensile yield and strain hardening stage, the compressive buckling and post-buckling stage, the compressive unloading and tensile reloading stage, and the compressive buckling bearing capacity degradation stage.

[0008] Based on the stage division of the stress-strain relationship of the rod, the function representation corresponding to the stress-strain relationship at different stages is constructed;

[0009] Based on the functional representation of the stress-strain relationship corresponding to different stages, the construction of the nonlinear hysteretic constitutive model of the rod is realized.

[0010] Furthermore, when constructing the functional representation corresponding to the stress-strain relationship at different stages, a dimensionless slenderness ratio was introduced to cope with the influence of different material properties of the rod; and a stiffness conversion coefficient was introduced to consider the stiffness degradation of the rod in the compressive unloading stage.

[0011] Furthermore, the tensile yielding and strain hardening stage is specifically expressed as:

[0012]

[0013] Among them, σ is the stress in tension, ε is the strain in tension, and ε y is the strain corresponding to the yield of the member under tension, and ε y =σ y / E, E is the elastic modulus, σ y is the stress corresponding to the yield of the rod under tension; κ is the conversion coefficient of stiffness in the plastic hardening stage; ε N is the strain corresponding to failure of the member in tension.

[0014] Furthermore, the compression buckling and post-buckling stages are specifically expressed as:

[0015]

[0016] Among them, σ is the stress under compression, ε is the strain under compression, E is the elastic modulus, and are the stress and strain of the member at the Xth buckling, X = 1, 2, 3…; ε M is the strain at point M; σ a is the asymptote of the minimum stress in the post-buckling stage; η 1 is the initial slope of the nonlinear post-buckling stage; η 2 is the slope change rate during the post-buckling phase.

[0017] Furthermore, the compression unloading and tension reloading stages are specifically expressed as:

[0018] Pressure unloading stage:

[0019] σ=σ F +vE(ε-ε F )

[0020] Where ε is the strain under compression, σ F and ε F are the stress and strain at point F, E is the elastic modulus, and ν is the stiffness conversion coefficient;

[0021] Tension reloading stage:

[0022]

[0023] Among them, ε is the strain under compression, E is the elastic modulus, σ H ,σ G and σ I are the stresses at points H, G and I respectively; ε H ,ε G ,ε I and ε N are the strains at points H, G, I and N respectively; χ is the conversion coefficient of stiffness from H to I; λ n is the dimensionless slenderness ratio, ξ 1 and 2 are the influence coefficients of sections H to I, and κ is the conversion coefficient of stiffness in the plastic hardening stage.

[0024] Furthermore, the compression buckling bearing capacity degradation stage is specifically expressed as:

[0025]

[0026] in, is the stress of the rod when it is buckled for the Xth time under compression, The stress at which the member first buckles, σ y is the stress corresponding to the yield of the member under tension, φ is the overall stability coefficient, λ n is the dimensionless slenderness ratio, ε p is the maximum plastic strain under historical tensile loading.

[0027] According to a second aspect of an embodiment of the present invention, a simulation method for a pole transmission tower is provided, comprising:

[0028] Constructing a nonlinear hysteretic constitutive model of the rods constituting the transmission tower; wherein the construction of the nonlinear hysteretic constitutive model of the rods is based on the above-mentioned method for constructing the nonlinear hysteretic constitutive model of the rods;

[0029] The constructed nonlinear hysteretic constitutive model of rods is applied to the numerical simulation of transmission towers;

[0030] Realize the simulation analysis of the hysteresis characteristics of the poles in the transmission tower and the bearing performance of the transmission tower.

[0031] According to a third aspect of an embodiment of the present invention, a simulation system for a pole transmission tower is provided, comprising:

[0032] A model building unit, which is used to build a nonlinear hysteretic constitutive model of rods constituting a transmission tower; wherein the construction of the nonlinear hysteretic constitutive model of the rods is based on the above-mentioned method for building a nonlinear hysteretic constitutive model of the rods;

[0033] A numerical simulation unit, which is used to apply the constructed nonlinear hysteretic constitutive model of the rod to the numerical simulation of the transmission tower;

[0034] The simulation analysis unit is used to realize the simulation analysis of the hysteresis characteristics of the rods in the transmission tower and the simulation analysis of the bearing performance of the transmission tower.

[0035] According to a fourth aspect of an embodiment of the present invention, there is provided an electronic device, comprising a memory, a processor, and a computer program stored and running on the memory, wherein when the processor executes the program, the method for constructing a nonlinear hysteretic constitutive model of a rod or a method for simulating a rod transmission tower is implemented.

[0036] According to a fifth aspect of an embodiment of the present invention, a non-transitory computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by a processor, the method for constructing a nonlinear hysteretic constitutive model of a rod or a method for simulating a rod transmission tower is implemented.

[0037] One or more of the above technical solutions have the following beneficial effects:

[0038] (1) The present invention provides a method for constructing a nonlinear hysteretic constitutive model of a rod, a simulation method and a system. By performing low-cycle reciprocating tension and compression tests on the rod, the compression buckling effect is considered. Based on the hysteresis characteristics of the rod and combined with the physical behavior of the rod under different stress states, the stress-strain relationship of the rod is divided into the tensile yield and strain hardening stage, the compressive buckling and post-buckling stage, the compressive unloading and tensile reloading stage and the compressive buckling bearing capacity degradation stage, so that it can truly present the complex physical characteristics of the rod under cyclic tension and compression loads.

[0039] (2) The present invention can define stress-strain relationship expressions for different mechanical behaviors in nonlinear hysteresis models, fit and optimize the empirical parameters in the expressions based on cyclic loading tests and numerical simulations, and accurately predict the hysteresis behavior of rods, thereby laying the foundation for the dynamic response and collapse analysis of transmission tower-line systems under severe convective weather, and ensuring the safe and stable operation of transmission lines.

[0040] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0042] Figure 1 Schematic diagram of the phenomenological hysteresis model described in an embodiment of the present invention;

[0043] Figure 2 It is a schematic diagram of the elastic tension and plastic hardening stages described in an embodiment of the present invention;

[0044] Figure 3 It is a schematic diagram of the compression buckling and post-buckling stages described in an embodiment of the present invention;

[0045] Figure 4 are the control parameter sample points and fitting curves described in the embodiment of the present invention, wherein (a) is the control parameter φ sample point and its fitting curve, and (b) is the control parameter σ a Sample points and their fitting curves, (c) is the control parameter η 1 Sample points and their fitting curves, (d) is the control parameter η 2 Sample points and their fitting curves;

[0046] Figure 5 It is a schematic diagram of the compression unloading-tension reloading stage described in an embodiment of the present invention;

[0047] Figure 6 are θ and λ described in the embodiment of the present invention n ε p Fitting schematic diagram;

[0048] Figure 7 The present invention is a flowchart of a method for constructing a nonlinear hysteretic constitutive model of a rod described in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0050] It should be noted that the terms used herein are for describing specific embodiments only and are not intended to be limiting of exemplary embodiments according to the present invention.

[0051] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0052] like Figure 7 As shown, an embodiment of the present invention provides a method for constructing a nonlinear hysteretic constitutive model of a rod, comprising:

[0053] Step 1: obtaining hysteresis characteristics of rods of different specifications; wherein the hysteresis characteristics are obtained based on a cyclic loading test of the rod;

[0054] Specifically, the step 1 specifically performs the following processing:

[0055] Low-cycle reciprocating tension and compression tests are carried out on rods of different specifications to obtain the hysteresis characteristics of the rods;

[0056] In addition, material property data are obtained through material property tests of steel components, and ABAQUS finite element analysis software is used to consider initial defects such as initial bending. The accuracy of the finite element model is verified by comparing the finite element results with the test results. On this basis, parametric analysis is carried out to obtain the influence of aspect ratio, width-to-thickness ratio and initial defects on the hysteretic characteristics of the rod.

[0057] Step 2: Based on the hysteresis characteristics of the rod and the physical behavior of the rod under different stress states, the stress-strain relationship of the rod is divided into the tensile yield and strain hardening stage, the compressive buckling and post-buckling stage, the compressive unloading and tensile reloading stage, and the compressive buckling bearing capacity degradation stage. Figure 1 As shown;

[0058] In the specific implementation, for the tensile yielding and strain hardening stages, a three-fold line model is used to describe the elastic tensile and plastic hardening stages (OAB) of the phenomenological hysteresis model, such as Figure 2 After the elastic tension of the rod reaches yield (point A), it enters the plastic hardening stage; when the strain reaches ε N When , the component is defined as failed. The elastic tension and plastic hardening stage (OAB) can be expressed as:

[0059]

[0060] Among them, σ is the stress in tension, ε is the strain in tension, and ε y is the strain corresponding to the yield of the member under tension, and ε y =σ y / E, E is the elastic modulus, σ y is the stress corresponding to the yield of the rod under tension; κ is the conversion coefficient of stiffness in the plastic hardening stage (i.e., AB segment); ε N It is the strain corresponding to the failure of the rod under tension (i.e. point N).

[0061] In the specific implementation, for the compression buckling and post-buckling stages, Figure 3As shown in the figure, a schematic diagram of the compression buckling and post-buckling stages is given. Buckling occurs for the first time after the elastic compression of the rod reaches point D, at which time the compressive bearing capacity reaches the maximum; the rod continues to be compressed and enters the post-buckling stage (DM), and its compressive bearing capacity shows a nonlinear decreasing trend. Assuming that the post-buckling stage is represented by an exponential function, the compression buckling and post-buckling stages can be expressed as:

[0062]

[0063] Among them, σ is the stress under compression, ε is the strain under compression, E is the elastic modulus, and are the stress and strain of the member at the Xth buckling, X = 1, 2, 3…; ε M is the strain at point M; σ a is the asymptote of the minimum stress in the post-buckling stage; η 1 is the initial slope of the nonlinear post-buckling stage; η 2 is the slope change rate during the post-buckling phase.

[0064] Buckling capacity of the member when it first buckles It can be expressed as

[0065]

[0066] In the formula, is the overall stability coefficient, which is related to the slenderness ratio λ. In order to consider the influence of different material properties of the rod, the dimensionless slenderness ratio λ is introduced n , which can be expressed as

[0067]

[0068] The finite element model verified by the cyclic loading test was used to carry out Riks nonlinear buckling analysis, and the first buckling bearing capacity and post-buckling curve of the member were obtained. Then, the simulation data were subjected to regression analysis, and the fitting expressions of the control parameters were obtained. Figure 4 The simulation sample points and regression curves of these control parameters are given, and the mathematical expression of the regression curve is

[0069]

[0070] In the specific implementation, for the compression unloading and tension reloading stages, Figure 5 A schematic diagram of the compression unloading-tension reloading stage is given. Since the compressive buckling of the member produces a large lateral deformation in the mid-span, the slope of the compression unloading section is significantly smaller than that of the tension unloading section, and gradually decreases with the accumulation of plastic strain. In order to consider the stiffness degradation phenomenon of the member in the compression unloading stage, the stiffness conversion coefficient ν is introduced. Then ν can be expressed as:

[0071]

[0072] σ Ft =-σ y +κE(ε F -ε y )#(10)

[0073] Therefore, the stress-strain relationship in the compressive unloading stage can be expressed as:

[0074] σ=σ F +vE(ε-ε F )#(11)

[0075] Where ε is the strain under compression, σ F and ε F are the stress and strain at point F, E is the elastic modulus, and ν is the stiffness conversion coefficient;

[0076] Under the combined action of the second-order bending moment and the axial force, the tension reloading stage (GHIJ) exhibits nonlinear characteristics, and reaches yield again at point I and enters the plastic hardening stage. Assuming that the tension reloading stage can be simulated by a single-leaf hyperbola and two straight line segments, it fully describes the plastic elongation phenomenon of the rod during the cyclic loading process, that is, under the same force level, the length of the rod in this cycle is always greater than the length in the previous cycle. Therefore, the mathematical expression of the tension reloading stage is:

[0077]

[0078] Among them, ε is the strain under compression, E is the elastic modulus, σ H ,σ G and σ I are the stresses at points H, G and I respectively; ε H ,ε G ,ε I and ε N are the strains at points H, G, I and N respectively; χ is the conversion coefficient of stiffness from H to I; λ n is the dimensionless slenderness ratio, ξ 1 and 2 are the influence coefficients of sections H to I, and κ is the conversion coefficient of stiffness in the plastic hardening stage.

[0079] In the specific implementation, for the degradation stage of compressive buckling bearing capacity, the cyclic displacement load causes the plastic strain of the rod to increase continuously, resulting in a gradual decrease in the compressive buckling bearing capacity. Considering the influence of the rod slenderness ratio and the accumulated plastic strain, the reduction degree of buckling bearing capacity is defined as the same as the general slenderness ratio λ. n Related to the maximum plastic strain in the historical cycle. Figure 6 The buckling capacity of the member and λ are given nε p The sample points are selected and the parameters of these sample points are fitted. Then, the buckling bearing capacity of the rod during the next cyclic loading is calculated using the following formula:

[0080]

[0081] in, is the stress of the rod when it is buckled for the Xth time under compression, The stress at which the member first buckles, λ n is the dimensionless slenderness ratio, ε p is the maximum plastic strain under historical tensile loading.

[0082] It can be seen that as λ n ε p As the value increases, θ decreases gradually, and the R 2 It reaches 0.95, indicating that equations (15) and (16) can reasonably present the buckling strength degradation behavior of the rod.

[0083] Step 3: Based on the stage division of the stress-strain relationship of the rod, construct the function representation corresponding to the stress-strain relationship at different stages;

[0084] Step 4: Based on the functional representation of the stress-strain relationship corresponding to different stages, the nonlinear hysteretic constitutive model of the rod is constructed.

[0085] In the specific implementation, in order to verify the validity of the above model, this embodiment uses Fortran language to compile the VUMAT user subroutine of the nonlinear hysteresis model, and uses the beam unit (B31) in the finite element software ABAQUS to establish a rod finite element model. By defining the user material parameter call, the hysteresis curve of the rod is simulated and fitted with the cyclic loading test and the finite element model to verify that the nonlinear hysteresis model has good simulation capabilities.

[0086] In one or more embodiments, based on the above-mentioned method for constructing a nonlinear hysteretic constitutive model of a rod, a simulation method for a rod transmission tower is provided, including:

[0087] Constructing a nonlinear hysteretic constitutive model of the rods constituting the transmission tower; wherein the construction of the nonlinear hysteretic constitutive model of the rods is based on the above-mentioned method for constructing the nonlinear hysteretic constitutive model of the rods;

[0088] The constructed nonlinear hysteretic constitutive model of rods is applied to the numerical simulation of transmission towers;

[0089] Realize the simulation analysis of the hysteresis characteristics of the poles in the transmission tower and the bearing performance of the transmission tower.

[0090] In one or more embodiments, a simulation system for a pole transmission tower is provided corresponding to the above-mentioned simulation method for a pole transmission tower, including:

[0091] A model building unit, which is used to build a nonlinear hysteretic constitutive model of rods constituting a transmission tower; wherein the construction of the nonlinear hysteretic constitutive model of the rods is based on the above-mentioned method for building a nonlinear hysteretic constitutive model of the rods;

[0092] A numerical simulation unit, which is used to apply the constructed nonlinear hysteretic constitutive model of the rod to the numerical simulation of the transmission tower;

[0093] The simulation analysis unit is used to realize the simulation analysis of the hysteresis characteristics of the rods in the transmission tower and the simulation analysis of the bearing performance of the transmission tower.

[0094] It can be understood that the system described in this embodiment corresponds to the method described in the above embodiment, and its technical details have been described in detail in Embodiment 1 and will not be repeated here.

[0095] In further embodiments, there is also provided:

[0096] An electronic device includes a memory and a processor and computer instructions stored in the memory and executed on the processor, wherein the computer instructions, when executed by the processor, perform the method described in the above embodiment. For the sake of brevity, no further description is given here.

[0097] It should be understood that in this embodiment, the processor may be a central processing unit CPU, and the processor may also be other general-purpose processors, digital signal processors DSP, application-specific integrated circuits ASIC, off-the-shelf programmable gate arrays FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0098] The memory may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory may also store information about the device type.

[0099] A computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by a processor, the method described in the above embodiment is completed.

[0100] The method in the above embodiment can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

[0101] Those skilled in the art will appreciate that the units, i.e., algorithm steps, of the various examples described in the present embodiment can be implemented in electronic hardware or in a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for constructing a nonlinear hysteretic constitutive model of a rod, characterized in that: include: Acquiring hysteresis characteristics of rods of different specifications; wherein the hysteresis characteristics are obtained based on a cyclic loading test of the rod; Based on the hysteresis characteristics of the rod and the physical behavior of the rod under different stress states, the stress-strain relationship of the rod is divided into the tensile yield and strain hardening stage, the compressive buckling and post-buckling stage, the compressive unloading and tensile reloading stage, and the compressive buckling bearing capacity degradation stage. Based on the stage division of the stress-strain relationship of the rod, the function representation corresponding to the stress-strain relationship at different stages is constructed; Based on the functional representation of the stress-strain relationship corresponding to different stages, the construction of the nonlinear hysteretic constitutive model of the rod is realized.

2. A method for constructing a nonlinear hysteretic constitutive model of a rod according to claim 1, characterized in that: When constructing the functional representation corresponding to the stress-strain relationship at different stages, the dimensionless slenderness ratio was introduced to cope with the influence of different material properties of the rod; and the stiffness conversion coefficient was introduced to consider the stiffness degradation of the rod in the compressive unloading stage.

3. A method for constructing a nonlinear hysteretic constitutive model of a rod according to claim 1, characterized in that: The tensile yield and strain hardening stages are specifically expressed as: Among them, σ is the stress in tension, ε is the strain in tension, and ε y is the strain corresponding to the yield of the member under tension, and ε y =σ y / E, E is the elastic modulus, σ y is the stress corresponding to the yield of the rod under tension; κ is the conversion coefficient of stiffness in the plastic hardening stage; εN is the strain corresponding to the failure of the rod under tension.

4. A method for constructing a nonlinear hysteretic constitutive model of a rod according to claim 1, characterized in that: The compression buckling and post-buckling stages are specifically expressed as: Among them, σ is the stress under compression, ε is the strain under compression, E is the elastic modulus, and are the stress and strain of the member at the Xth buckling, X = 1, 2, 3…; ε M is the strain at point M; σ a is the asymptote of the minimum stress in the post-buckling stage; η1 is the initial slope of the nonlinear post-buckling stage; η2 is the slope change rate in the post-buckling stage.

5. The method for constructing a nonlinear hysteretic constitutive model of a rod according to claim 1, characterized in that: The compression unloading and tension reloading stages are specifically expressed as: Pressure unloading stage: s = s F +vvE(e-e F ) Where ε is the strain under compression, σ F and ε F are the stress and strain at point F, E is the elastic modulus, and V is the stiffness conversion coefficient; Tension reloading stage: Among them, ε is the strain under compression, E is the elastic modulus, σ H , σ G and σ I are the stresses at points H, G and I respectively; ε H , ε G , ε I and ε N are the strains at points H, G, I and N respectively; χ is the conversion coefficient of stiffness from H to I; λ n is the dimensionless slenderness ratio, ξ1 and ξ2 are the influence coefficients of sections H to I, and K is the conversion coefficient of stiffness in the plastic hardening stage.

6. A method for constructing a nonlinear hysteretic constitutive model of a rod according to claim 1, characterized in that: The compression buckling bearing capacity degradation stage is specifically expressed as: in, is the stress of the rod when it is buckled for the Xth time under compression, The stress when the member first buckles, σy is the stress corresponding to the yield of the member under tension, φ is the overall stability coefficient, and λ is n is the dimensionless slenderness ratio, ε p is the maximum plastic strain under historical tensile loading.

7. A simulation method for a pole transmission tower, characterized in that: include: Constructing a nonlinear hysteretic constitutive model of the rods constituting the transmission tower; wherein the construction of the nonlinear hysteretic constitutive model of the rods is based on the above-mentioned method for constructing the nonlinear hysteretic constitutive model of the rods; The constructed nonlinear hysteretic constitutive model of rods is applied to the numerical simulation of transmission towers; Realize the simulation analysis of the hysteresis characteristics of the poles in the transmission tower and the bearing performance of the transmission tower.

8. A simulation system for a pole transmission tower, characterized in that: include: A model building unit, which is used to build a nonlinear hysteretic constitutive model of rods constituting a transmission tower; wherein the construction of the nonlinear hysteretic constitutive model of the rods is based on the above-mentioned method for building a nonlinear hysteretic constitutive model of the rods; A numerical simulation unit, which is used to apply the constructed nonlinear hysteretic constitutive model of the rod to the numerical simulation of the transmission tower; The simulation analysis unit is used to realize the simulation analysis of the hysteresis characteristics of the rods in the transmission tower and the simulation analysis of the bearing performance of the transmission tower.

9. An electronic device, comprising a memory, a processor, and a computer program stored and running on the memory, wherein when the processor executes the program, the method for constructing a nonlinear hysteretic constitutive model of a rod as described in any one of claims 1 to 6 or the method for simulating a rod transmission tower as described in claim 7 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for constructing a nonlinear hysteretic constitutive model of a rod as described in any one of claims 1 to 6 or a method for simulating a rod transmission tower as described in claim 7.

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