Steel square tube load capacity evaluation method and device, electronic equipment and storage medium

Abstract

The application provides a steel square tube load capacity evaluation method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring size data and material attribute data of a steel square tube to be measured; determining a first load end-shortening curve of the steel square tube to be measured under a local panel buckling condition and a second load end-shortening curve of the steel square tube to be measured under a whole beam-column buckling condition according to the size data and the material attribute data; and determining a limit bearing capacity value of the steel square tube to be measured according to the first load end-shortening curve and the second load end-shortening curve. The first load end-shortening curve of the steel square tube to be measured under the local panel buckling condition and the second load end-shortening curve of the steel square tube to be measured under the whole beam-column buckling condition are constructed, and the limit bearing capacity value of the steel square tube to be measured is determined according to the first load end-shortening curve and the second load end-shortening curve, so that the buckling mode of the steel square tube can be quickly judged, and the load capacity of the steel square tube can be quickly and accurately evaluated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of square tube structure, and particularly relates to a steel square tube load capacity evaluation method and device, electronic equipment and computer readable storage medium. BACKGROUND

[0002] The thin-walled steel square tube is usually a square or rectangular tube structure, which is widely used in the fields of shipbuilding, construction, machinery and the like, and is used to bear various loads such as tensile compression and bending, and thus the load capacity of the steel square tube needs to be accurately evaluated to ensure that the steel square tube has sufficient compression stability reserve to prevent buckling collapse and cause accidents of article structure and damage to personnel.

[0003] Under the action of the end compression load, the local panel of the steel square tube at the load position will be buckled under the action of the load, and the overall beam column will also be buckled under the action of the load, so that the steel square tube has two buckling modes of local panel buckling and overall beam column buckling under the action of the compression load. The existing limit load analysis methods for the steel square tube mainly include the effective width method, the direct strength method and the finite element method. The effective width method replaces the original section with the effective section width to reduce the stiffness of the square tube, and then calculates the limit load through the column curve of the steel square tube. The direct strength method calculates the limit load of the steel square tube through the regularization fine ratio classification. The finite element method judges the buckling mode of the steel square tube and calculates the limit load of the steel square tube through a complex process of geometric modeling, constraint load application, solution setting and post-processing. However, the effective width method and the direct strength method in the prior art cannot distinguish the buckling mode of the steel square tube, and thus have low accuracy. The finite element method has low universality due to the complex process, and cannot be effectively and quickly evaluated. SUMMARY

[0004] Therefore, it is necessary to provide a steel square tube load capacity evaluation method and device, electronic equipment and computer readable storage medium, which can quickly judge the buckling mode of the steel square tube, and thus can quickly and accurately evaluate the limit load of the steel square tube.

[0005] To solve the above problems, the present application provides a steel square tube load capacity evaluation method, which comprises the following steps:

[0006] obtaining size data and material attribute data of a steel square tube to be measured;

[0007] determining a first load end compression curve of the steel square tube to be measured under the condition of local panel buckling and a second load end compression curve of the steel square tube to be measured under the condition of overall beam column buckling according to the size data and the material attribute data;

[0008] According to the first load end shrinkage curve and the second load end shrinkage curve, the limit bearing capacity value of the steel square tube to be tested is determined.

[0009] Further, the size data of the steel square tube to be tested is obtained, including:

[0010] The size data of the steel square tube to be tested is measured, including the length of the steel square tube to be tested, the thickness of the four edges of the rectangular cross section of the steel square tube to be tested, and the height and width of the rectangular cross section of the steel square tube to be tested.

[0011] According to the size data of the steel square tube to be tested, the width on the neutral plane of the plate of the rectangular cross section of the steel square tube to be tested, the height of the center axis, and the cross section area are determined.

[0012] Further, the material attribute data of the steel square tube to be tested is obtained, including:

[0013] The tensile test is performed on the steel material constituting the steel square tube to be tested to obtain the tensile curve and the yield strength of the steel material, and the linear slope fitting is performed on the tensile curve to obtain the elastic modulus of the steel material.

[0014] Further, the first load end shrinkage curve of the steel square tube to be tested under the local panel buckling condition is determined, including:

[0015] According to the size data and the material attribute data of the steel square tube to be tested, the panel flexibility of the side edge of the rectangular cross section of the steel square tube to be tested is determined.

[0016] According to the panel flexibility and the size data, the effective width of the side edge of the rectangular cross section of the steel square tube to be tested is determined.

[0017] According to the size data, the material attribute data, and the effective width, the first load end shrinkage curve of the steel square tube to be tested under the local panel buckling condition is constructed.

[0018] Further, the second load end shrinkage curve of the steel square tube to be tested under the overall beam-column buckling condition is determined, including:

[0019] According to the size data and the material attribute data of the steel square tube to be tested, it is determined whether the size and the material of each side surface of the steel square tube to be tested are the same.

[0020] If the size and the material of each side surface of the steel square tube to be tested are the same, the second load end shrinkage curve of any one side surface of the steel square tube to be tested under the overall beam-column buckling condition is established.

[0021] If the size or the material of any two side surfaces of the steel square tube to be tested is different, the second load end shrinkage curve of each side surface of the steel square tube to be tested under the overall beam-column buckling condition is established.

[0022] Further, a second load-end shrinkage curve of each side of the steel square tube under the overall beam-column buckling condition is established, including:

[0023] According to the size data and material attribute data of the steel square tube, equivalent yield strength of each side of the steel square tube is determined, and effective area and moment of inertia of the compression surface under the buckling state of each side are determined;

[0024] According to the effective area and moment of inertia of the compression surface under the buckling state of each side, elastic Euler stress of each side is determined, and critical stress of each side is determined according to the elastic Euler stress;

[0025] According to the effective area and the critical stress, the second load-end shrinkage curve of each side of the steel square tube under the overall beam-column buckling condition is constructed.

[0026] Further, according to the first load-end shrinkage curve and the second load-end shrinkage curve, the ultimate bearing capacity value of the steel square tube is determined, including:

[0027] According to the first load-end shrinkage curve, the first ultimate load of the steel square tube under the local panel buckling condition is determined;

[0028] According to the second load-end shrinkage curve, the second ultimate load of the steel square tube under the overall beam-column buckling condition is determined;

[0029] The first ultimate load and the second ultimate load are compared, and the ultimate bearing capacity value of the steel square tube is determined according to the minimum value of the first ultimate load and the second ultimate load.

[0030] The application also provides a steel square tube bearing capacity evaluation device, including:

[0031] The data acquisition unit is used for acquiring size data and material attribute data of the steel square tube to be measured;

[0032] The curve establishment unit is used for determining, according to the size data and material attribute data, a first load-end shrinkage curve of the steel square tube to be measured under the local panel buckling condition, and a second load-end shrinkage curve of the steel square tube to be measured under the overall beam-column buckling condition;

[0033] The bearing capacity evaluation unit is used for determining, according to the first load-end shrinkage curve and the second load-end shrinkage curve, the ultimate bearing capacity value of the steel square tube to be measured.

[0034] The application also provides an electronic device, including a memory and a processor, wherein,

[0035] The memory is used for storing programs;

[0036] The processor is coupled with the memory and used for executing the program stored in the memory to realize the steps in the steel square tube load capacity evaluation method.

[0037] The application further provides a computer readable storage medium, which stores a computer program, and the computer program realizes the steel square tube load capacity evaluation method when executed by a processor.

[0038] Compared with the prior art, the beneficial effects of the above-mentioned embodiments are that: in the steel square tube load capacity evaluation method provided by the application, first, the size data and material attribute data of the steel square tube to be measured are obtained; then, according to the size data and material attribute data, the first load end shrinkage curve of the steel square tube to be measured under the local panel buckling condition and the second load end shrinkage curve of the steel square tube to be measured under the overall beam column buckling condition are determined; finally, according to the first load end shrinkage curve and the second load end shrinkage curve, the ultimate load capacity value of the steel square tube to be measured is determined. In summary, the first load end shrinkage curve of the steel square tube to be measured under the local panel buckling condition and the second load end shrinkage curve of the steel square tube to be measured under the overall beam column buckling condition are constructed, and the ultimate load capacity value of the steel square tube to be measured is determined through the first load end shrinkage curve and the second load end shrinkage curve, so as to realize the technical effect of quickly judging the buckling mode of the steel square tube and quickly and accurately evaluating the load capacity of the steel square tube. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0040] Figure 1 The flowchart of one embodiment of the steel square tube load capacity evaluation method provided by the application;

[0041] Figure 2 The load end shrinkage curve diagram of the steel square tube to be measured under the compression load in the embodiment of the application;

[0042] Figure 3 The rectangular cross-section diagram of the steel square tube to be measured in the embodiment of the application;

[0043] Figure 4 The structural diagram of one embodiment of the steel square tube load capacity evaluation device provided by the application;

[0044] Figure 5A structural schematic diagram of one embodiment of the electronic device provided by the present application. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the protection scope of the present application.

[0046] It should be understood that the drawings of the schematic diagrams are not drawn according to the actual proportions. The flowcharts used in the present application show the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowcharts or one or more operations can be removed from the flowcharts by a person skilled in the art under the guidance of the content of the present application.

[0047] Some block diagrams shown in the drawings are functional entities, which do not necessarily have to correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different network and / or processor systems and / or microcontroller systems.

[0048] In this document, the reference to "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean that it refers to the same embodiment, nor is it independent or alternative to other embodiments. A person skilled in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0049] Figure 1 A flowchart of one embodiment of the steel square tube load capacity evaluation method provided by the present application is shown in FIG. 1. As shown in FIG. 1, the steel square tube load capacity evaluation method comprises the following steps. Figure 1

[0050] S101, acquiring size data and material attribute data of a steel square tube to be tested;

[0051] S102, determining a first load-end shrinkage curve of the steel square tube to be tested under a local panel buckling condition and a second load-end shrinkage curve of the steel square tube to be tested under a whole beam-column buckling condition according to the size data and the material attribute data;

[0052] ​S103. Determine the ultimate bearing capacity value of the steel square tube to be tested based on the first load end contraction curve and the second load end contraction curve.

[0053] Specifically, in the load capacity assessment method for steel square tubes provided by this invention, firstly, the dimensional data and material property data of the steel square tube to be tested are acquired; then, based on the dimensional data and material property data, the first load end contraction curve of the steel square tube under local plate buckling conditions and the second load end contraction curve of the steel square tube under overall beam-column buckling conditions are determined; finally, based on the first load end contraction curve and the second load end contraction curve, the ultimate bearing capacity value of the steel square tube to be tested is determined. In summary, this invention achieves the technical effect of rapidly determining the buckling mode of the steel square tube and quickly and accurately assessing its load capacity by constructing the first load end contraction curve of the steel square tube under local plate buckling conditions and the second load end contraction curve under overall beam-column buckling conditions, and by determining the ultimate bearing capacity value of the steel square tube using the first and second load end contraction curves.

[0054] It should be noted that, based on the elasticity and plasticity of steel, the schematic diagram of the load-end contraction curve of the steel square tube under compressive load is shown below. Figure 2 As shown, the process can be divided into three parts: the initial stage is a linear elastic response; after exceeding the elastic limit, a nonlinear elastoplastic response appears; and after the compressive load exceeds the ultimate bearing capacity, a large plastic response occurs after buckling and collapse. The load capacity assessment method for steel square tubes provided by this invention is to solve for the ultimate bearing capacity of the steel square tube under test, so as to avoid irreversible structural deformation of the steel square tube exceeding the ultimate bearing capacity during use.

[0055] In a specific embodiment of the present invention, obtaining the dimensional data of the steel square tube to be tested includes:

[0056] The dimensional data of the steel square tube to be tested are obtained by measurement. The dimensional data includes the length of the steel square tube to be tested, the thickness of the four sides of the rectangular cross-section of the steel square tube to be tested, and the height and width of the rectangular cross-section of the steel square tube to be tested.

[0057] Based on the dimensional data of the steel square tube to be tested, determine the width, central axis height, and cross-sectional area of ​​the plate neutral surface of the rectangular cross-section of the steel square tube to be tested.

[0058] Specifically, Figure 3 This is a schematic diagram of the rectangular cross-section of the steel square tube to be tested, as shown below. Figure 3 As shown, the length l of the steel square tube to be tested and the thickness t of the four sides of the rectangular cross-section are obtained by measurement. i (=1~4), and the height a and width b of the rectangular cross-section of the steel square tube to be measured, the width s on the neutral surface of the rectangular cross-section is obtained by conversion. iand calculate the cross-sectional area A:

[0059]

[0060] and according to the four-side thickness t i and the width s on the neutral surface of the rectangular cross-section i the height h of the corresponding neutral axis of the four sides is calculated i :

[0061]

[0062] h3=1-h1,h4=2-h2

[0063] In specific embodiments of the present application, the material attribute data of the steel square tube to be measured is obtained, including:

[0064] The tensile test is performed on the steel material constituting the steel square tube to be measured to obtain the tensile curve and yield strength of the steel material, and the linear slope fitting is performed on the tensile curve to obtain the elastic modulus of the steel material.

[0065] Specifically, the tensile test of the steel material of the steel square tube to be measured is carried out, the stress at 0.2% strain without yield platform or the lower yield point of the yield platform is selected as the yield strength σ yi (=1~4), and the linear slope fitting is performed according to the tensile curve obtained in the tensile test to obtain the elastic modulus E of the steel material.

[0066] It should be noted that the tensile test is a test method for measuring material properties under axial tensile load. The data obtained by the tensile test can determine the performance indicators such as the elastic limit, elastic modulus, tensile strength, yield strength, etc. of the material.

[0067] In specific embodiments of the present application, the first load end shrinkage curve of the steel square tube to be measured under the condition of local panel buckling is determined, including:

[0068] According to the size data and material attribute data of the steel square tube to be measured, the panel flexibility of the rectangular cross-section of the steel square tube to be measured is determined;

[0069] According to the panel flexibility and size data, the effective width of the rectangular cross-section of the steel square tube to be measured is determined;

[0070] According to the size data, material attribute data and effective width, the first load end shrinkage curve of the steel square tube to be measured under the condition of local panel buckling is constructed.

[0071] Specifically, the load end shrinkage curve of local panel buckling is analyzed, at this time the four-side panels in the cross-section of the square tube are all under compressive stress, according to the size data and material attribute data, the panel flexibility β of any two adjacent sides of the rectangular cross-section of the steel square tube to be measured is calculatedEi :

[0072]

[0073] wherein, ε E is the applied strain, i.e. the deformation of the steel square tube to be measured caused by the load. Y is the yield strain, i.e. the deformation of the steel square tube to be measured when reaching the yield point.

[0074] Then based on the elastic-plasticity of the steel material, the effective width b Ei :

[0075]

[0076] Finally, according to the effective width, the first load-end-shortening curve (σ CR0 -curve) of the steel square tube to be measured under the local panel buckling condition is calculated:

[0077]

[0078] wherein, φ is the edge function

[0079] In the specific embodiments of the present application, the second load-end-shortening curve of the steel square tube to be measured under the overall beam-column buckling condition is determined, comprising:

[0080] According to the size data and material attribute data of the steel square tube to be measured, it is determined whether the size and material of each side surface of the steel square tube to be measured are the same.

[0081] If the size and material of each side surface of the steel square tube to be measured are the same, the second load-end-shortening curve of any one side surface of the steel square tube to be measured under the overall beam-column buckling condition is established.

[0082] If the size or material of any two side surfaces of the steel square tube to be measured are different, the second load-end-shortening curve of each side surface of the steel square tube to be measured under the overall beam-column buckling condition is established.

[0083] Specifically, the load-end shrink curve under the overall beam-column buckling condition is carried out, and the stress surface can be any side surface of the four side surfaces, at this time, the steel square tube is subjected to tensile stress on one side and compressive stress on the other side, the compressive stress side plate is considered to bear part of the area by the effective width, and the tensile stress side plate is fully area plate bearing. Therefore, according to the structure of the steel square tube, the cross section is square, that is, the four edge plate materials of the steel square tube are the same in size and material, the load-end shrink curve under the beam-column buckling condition of the four edges is the same, and only the load-end shrink curve of any side surface needs to be solved; when the cross section is rectangular, the load-end shrink curves of each side surface need to be calculated respectively, and the corresponding ultimate load is obtained according to the load-end shrink curves of each side surface, and the minimum value of the ultimate load is taken as the ultimate load under the beam-column buckling condition.

[0084] In a specific embodiment of the present application, the second load-end shrink curve of each side surface of the steel square tube to be tested under the overall beam-column buckling condition is established, comprising:

[0085] According to the size data and material attribute data of the steel square tube to be tested, the equivalent yield strength of each side surface of the steel square tube to be tested is determined, and the effective area and the moment of inertia of the compression surface under the buckling state of each side surface are determined;

[0086] According to the effective area and the moment of inertia of the compression surface under the buckling state of each side surface, the elastic Euler stress of each side surface is determined, and the critical stress of each side surface is determined according to the elastic Euler stress;

[0087] According to the effective area and the critical stress, the second load-end shrink curve of each side surface of the steel square tube to be tested under the overall beam-column buckling condition is constructed.

[0088] Specifically, according to the size data and material attribute data of the steel square tube to be tested, the equivalent yield strength σ yeqi of each side surface of the steel square tube to be tested is calculated, and since the steel square tube to be tested is a rectangular structure, the equivalent yield strengths of the opposite side surfaces are equal:

[0089]

[0090]

[0091] And the effective area A i and the moment of inertia I i of the effective width of the cross section corresponding to the compression surface are calculated:

[0092]

[0093]

[0094] And the effective area and the moment of inertia are obtained, the elastic Euler stress σ Ei, based on the elastic-plasticity of steel material, the critical stress σ of each side is determined by the elastic Euler stress and the yield strength Ci :

[0095]

[0096]

[0097] Finally, the load-end shrinkage curve (σ CRi - curve) of the steel square tube under the overall beam-column buckling condition is obtained:

[0098]

[0099] It should be noted that when the size and material of the four edges of the steel square tube are the same, only the load-end shrinkage curve of any side needs to be solved, and the solving process is the same as the above solving process, which will not be repeated here.

[0100] In a specific embodiment of the present application, according to the first load-end shrinkage curve and the second load-end shrinkage curve, the limit load capacity value of the steel square tube to be measured is determined, comprising:

[0101] According to the first load-end shrinkage curve, the first limit load of the steel square tube to be measured under the local panel buckling condition is determined;

[0102] According to the second load-end shrinkage curve, the second limit load of the steel square tube to be measured under the overall beam-column buckling condition is determined;

[0103] The first limit load and the second limit load are compared, and the limit load capacity value of the steel square tube to be measured is determined according to the minimum value of the first limit load and the second limit load.

[0104] Specifically, after obtaining the first load curve under the local panel buckling condition and the second load curve under the overall beam-column buckling condition, first, the first limit load of the steel square tube to be measured under the local panel buckling condition is determined according to the obtained first load curve; Then the second limit load corresponding to the second load curve of each side under the overall beam-column buckling condition is obtained; Finally, by comparing the first limit load and the second limit load, the limit load capacity value of the steel square tube to be measured is determined, and the limit load capacity value corresponding to the buckling mode.

[0105] In order to better implement the steel square tube load capacity evaluation method in the embodiment of the present application, on the basis of the steel square tube load capacity evaluation method, the present application also provides a steel square tube load capacity evaluation device 400, as shown in Figure 4 , comprising:

[0106] A data acquisition unit 401 is configured to acquire size data and material attribute data of a steel square tube to be measured.

[0107] Curve establishment unit 402 is used to determine the first load end contraction curve of the steel square tube under local plate buckling condition and the second load end contraction curve of the steel square tube under overall beam-column buckling condition based on the dimensional data and material property data.

[0108] The load-bearing capacity assessment unit 403 is used to determine the ultimate load-bearing capacity value of the steel square tube under test based on the first load end contraction curve and the second load end contraction curve.

[0109] The steel square tube load capacity assessment device 400 provided in the above embodiments can realize the technical solutions described in the above embodiments of the steel square tube load capacity assessment method. The specific implementation principles of each module or unit can be found in the corresponding content in the above embodiments of the steel square tube load capacity assessment method, which will not be repeated here.

[0110] Based on the method for evaluating the load-bearing capacity of steel square tubes, this invention also provides an electronic device, such as... Figure 5 As shown, Figure 5 This is a schematic diagram of an embodiment of the electronic device provided by the present invention. The electronic device 500 includes a processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. When the processor 501 executes the program, it implements the steel square tube load capacity assessment method as described above.

[0111] In a preferred embodiment, the electronic device further includes a display 503 for displaying the process by which the processor 501 performs the steel square tube load capacity assessment method as described above.

[0112] The processor 501 may be an integrated circuit chip with signal processing capabilities. The processor 501 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP) or an application-specific integrated circuit (ASIC). It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor can also be a microprocessor or any conventional processor.

[0113] The memory 502 may be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Secure Digital (SD card), Flash Card, etc. The memory 502 stores programs, and the processor 501 executes these programs upon receiving execution instructions. The process definition methods disclosed in any of the foregoing embodiments of the present invention can be applied to the processor 501, or implemented by the processor 501.

[0114] The display 503 can be an LED display, an LCD display, or a touch screen display, etc. The display 503 is used to display various information from the electronic device 500.

[0115] Understandable, Figure 5 The structure shown is only a schematic diagram of one possible structure of electronic device 500. Electronic device 500 may also include more than one of the following: Figure 5 Show more or fewer components. Figure 5 The components shown can be implemented using hardware, software, or a combination thereof.

[0116] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steel square tube load capacity assessment method as described above.

[0117] Generally, computer instructions for implementing the methods of the present invention can be carried on any combination of one or more computer-readable storage media. Non-transitory computer-readable storage media can include any computer-readable medium except for transient, propagating signals themselves.

[0118] Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0119] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for evaluating load capacity of a steel square tube, characterized by, The method comprises the following steps: obtaining size data and material attribute data of the steel square tube to be tested; determining a first load-end shortening curve of the steel square tube to be tested under a local panel buckling condition and a second load-end shortening curve of the steel square tube to be tested under a whole beam-column buckling condition according to the size data and the material attribute data; determining a limit bearing capacity value of the steel square tube to be tested according to the first load-end shortening curve and the second load-end shortening curve. The method for determining the first load-end shortening curve of the steel square tube to be tested under the local panel buckling condition comprises the following steps: determining panel flexibility of a side of a rectangular cross section of the steel square tube to be tested according to the size data and the material attribute data of the steel square tube to be tested; determining effective width of the side of the rectangular cross section of the steel square tube to be tested according to the panel flexibility and the size data; constructing the first load-end shortening curve of the steel square tube to be tested under the local panel buckling condition according to the size data, the material attribute data and the effective width. The method for determining the second load-end shortening curve of the steel square tube to be tested under the whole beam-column buckling condition comprises the following steps: judging whether the size and material of each side of the steel square tube to be tested are the same according to the size data and the material attribute data of the steel square tube to be tested; if the size and material of each side of the steel square tube to be tested are the same, constructing a second load-end shortening curve of an arbitrary side of the steel square tube to be tested under the whole beam-column buckling condition; if the size or material of any two sides of the steel square tube to be tested are different, constructing second load-end shortening curves of each side of the steel square tube to be tested under the whole beam-column buckling condition. The method for constructing the second load-end shortening curves of each side of the steel square tube to be tested under the whole beam-column buckling condition comprises the following steps: determining equivalent yield strength of each side of the steel square tube to be tested, and effective area and moment of inertia of a compression surface under a buckling state of each side according to the size data and the material attribute data of the steel square tube to be tested; determining elastic Euler stress of each side according to the effective area and the moment of inertia of the compression surface under the buckling state of each side, and determining critical stress of each side according to the elastic Euler stress; constructing the second load-end shortening curves of each side of the steel square tube to be tested under the whole beam-column buckling condition according to the effective area and the critical stress.

2. The steel square tube load capacity evaluation method according to claim 1, characterized by, The method for obtaining the size data of the steel square tube to be tested comprises the following steps: measuring the size data of the steel square tube to be tested, wherein the size data comprises length of the steel square tube to be tested, thickness of four sides of a rectangular cross section of the steel square tube to be tested, and height and width of the rectangular cross section of the steel square tube to be tested; determining width on a neutral surface of a plate of the rectangular cross section of the steel square tube to be tested, central axis height and cross section area according to the size data of the steel square tube to be tested.

3. The steel square tube load capacity evaluation method according to claim 1, characterized by, The method for obtaining the material attribute data of the steel square tube to be tested comprises the following steps: performing a tensile test on steel material constituting the steel square tube to be tested to obtain a tensile curve and yield strength of the steel material, and performing linear slope fitting on the tensile curve to obtain an elastic modulus of the steel material.

4. The steel square tube load capacity evaluation method according to claim 1, characterized by, The method for determining the limit bearing capacity value of the steel square tube to be tested according to the first load-end shortening curve and the second load-end shortening curve comprises the following steps: determining a first limit load of the steel square tube to be tested under the local panel buckling condition according to the first load-end shortening curve; According to the second load end shrinkage curve, a second limit load of the steel square tube to be tested under a whole beam column buckling condition is determined; The first limit load and the second limit load are compared, and a limit bearing capacity value of the steel square tube to be tested is determined according to a minimum value among the first limit load and the second limit load.

5. A steel square tube load capacity evaluation device for implementing the steel square tube load capacity evaluation method according to any one of claims 1 to 4, characterized by Comprise: A data acquisition unit configured to acquire size data and material attribute data of the steel square tube to be tested; A curve establishing unit configured to determine, according to the size data and the material attribute data, a first load end shrinkage curve of the steel square tube to be tested under a local plate grid buckling condition, and a second load end shrinkage curve of the steel square tube to be tested under a whole beam column buckling condition; A bearing capacity evaluating unit configured to determine, according to the first load end shrinkage curve and the second load end shrinkage curve, a limit bearing capacity value of the steel square tube to be tested.

6. An electronic device, comprising: Comprise a memory and a processor, wherein The memory is configured to store a program; The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps in the steel square tube load capacity evaluation method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and the computer program, when executed by a processor, implements the steel square tube load capacity evaluation method according to any one of claims 1 to 4.

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