Steel frame structure damage identification method and system based on damage morphological parameters

Abstract

The invention discloses a steel frame structure damage identification method and system based on damage morphological parameters, and the method comprises the steps: obtaining the relation between the damage degree and the reduction of an elastic modulus according to a steel damage test; the nondestructive height ratio, the average loading elastic modulus and the damage model of the damaged section are determined through the section damage morphological parameters; according to the steel member section damage model, the damage section distribution and the steel member deflection deformation value, a damaged steel member damage model expressed by damage form parameters is constructed, and the corresponding residual bearing capacity and flexural rigidity of the steel member are obtained; according to the section of the damaged steel frame structure and the steel member damage model, the mechanical relation between the damage degree and the bearing capacity of the steel frame structure is obtained, the damage model of the steel frame structure is constructed, and the damaged steel frame structure damage identification method is provided. And judging whether the residual bearing capacity and rigidity of the damaged steel frame structure can meet the stress requirements or not. The method is applicable to safety and reliability evaluation of any steel frame structure.

Description

Technical Field

[0001] The present invention relates to the technical field of damage detection of steel frame structures, and particularly discloses a method and system for identifying damage of steel frame structures based on damage morphology parameters. Background Art

[0002] Damage will cause the degradation of the strength and stiffness of steel, resulting in a reduction in the bearing capacity of the damaged section, damaged member, damaged joint and damaged structure, increased deformation, and affecting the normal use safety of the steel frame structure. The higher the degree of damage, the more serious the degradation of strength and stiffness. The existing methods for identifying damage in steel frame structures usually install several sensors on the steel frame structure to obtain the response data information of the structure, and judge the damage situation of the structure by analyzing and processing the information. The basic composition schematic diagram is as shown in the following figure. The existing methods for identifying damage in steel frame structures have good applicability to structures with health monitoring measures.

[0003] However, in actual engineering applications, the vast majority of steel frame structures do not adopt health monitoring measures and it is impossible to obtain the relevant mechanical parameter information before and after the structure is damaged. Therefore, it is difficult to apply the existing structure damage identification methods to judge the actual damage degree of the vast majority of steel frame structures without health monitoring measures.

[0004] Therefore, the above-mentioned defects existing in the existing structure damage identification methods are technical problems that need to be solved urgently at present. Summary of the Invention

[0005] The present invention provides a method and system for identifying damage of steel frame structures based on damage morphology parameters, aiming to solve at least one of the defects existing in the above-mentioned existing structure damage identification methods.

[0006] One aspect of the present invention relates to a method for identifying damage of steel frame structures based on damage morphology parameters, including the following steps: Conduct material property tests on steel materials of different materials at different damage degrees to obtain the relationship between the damage degree and the reduction rate of the elastic modulus of the steel; Conduct a loading test on the steel member to obtain the load magnitude, strain gauge reading, displacement reading and the first damage morphology parameter of the steel member at different damage degrees; Adopt a numerical simulation analysis method to establish a finite element analysis model of the steel member, calculate the mechanical properties of the member when the geometric parameters change, and obtain the bearing capacity, cross-section stress distribution data, member deflection deformation value and the second damage morphology parameter of the steel member at different damage degrees; Calculate the ratio of the non-damaged height of the cross-section according to the cross-section strain distribution data; Obtain the average loading elastic modulus of the damaged cross-section according to the ratio of the non-damaged height of the cross-section and the relationship between the damage degree of the steel and the reduction rate of the elastic modulus; The elastic modulus degradation rate of the cross-section of the damaged steel member is used to evaluate the cross-section damage factor; Based on the bearing capacity, the deflection deformation value of the member, the first damage mode parameter, and the second damage mode parameter, combined with the cross-section damage factor, establish the mechanical relationship among the damage mode parameter, the bearing capacity, the deflection, and the damage factor, and construct a damage model of the damaged steel member expressed by the damage mode parameter; Calculate the damaged steel member damage model to obtain the corresponding remaining bearing capacity and flexural stiffness of the steel member, propose a damage identification method for the damaged steel member, and judge whether the remaining bearing capacity and stiffness of the steel member after damage can meet the stress requirements.

[0007] Furthermore, in the step of calculating the non-damaged height ratio of the cross-section according to the cross-section strain distribution data, the non-damaged height ratio of the cross-section is:

[0008] where is the non-damaged height of the cross-section, is the non-damaged height of the cross-section, is the height of the cross-section.

[0009] Furthermore, in the step of obtaining the average loading elastic modulus of the damaged cross-section according to the relationship between the non-damaged height ratio of the cross-section and the steel damage degree and the elastic modulus degradation rate, the average loading elastic modulus of the damaged cross-section is:

[0010] where is the average loading elastic modulus of the damaged cross-section, is the elastic modulus of the steel after damage, is the cross-sectional area of the member.

[0011] Furthermore, in the step of using the elastic modulus degradation rate of the cross-section of the damaged steel member to evaluate the cross-section damage factor, the cross-section damage factor is:

[0012] where is the cross-section damage factor, is the average loading elastic modulus of the cross-section when the non-damaged height ratio of the cross-section is , , is the non-damaged height of the cross-section, is the height of the cross-section; η is the cross-section size correction coefficient, which is determined by the average loading elastic modulus reduction rate at full cross-section yield.

[0013] Furthermore, after calculating the damage model of the damaged steel members to obtain the corresponding remaining load-bearing capacity and flexural stiffness of the steel members, and proposing a damage identification method for the damaged steel members, and judging whether the remaining load-bearing capacity and stiffness of the steel members after damage can meet the stress requirements, the following steps are further included: Conduct experimental tests on the steel frame structure to obtain the load magnitude, strain gauge readings, displacement values, and the third damage morphology parameters of the steel members and the steel frame structure under different damage degrees; Adopt the numerical simulation analysis method to obtain the bearing capacity, cross-section stress values, cross-section displacement values, and the fourth damage morphology parameters of the steel members and the steel frame structure; According to the cross-section stress values, cross-section displacement values, third damage morphology parameters, and fourth damage morphology parameters, combined with the cross-section damage factor, calculate the damage factors of each damaged steel member; According to the third damage morphology parameters, fourth damage morphology parameters, and the damage factors of each damaged steel member, calculate the damage factor of the steel frame structure; According to the bearing capacity and the damage factor of the steel frame structure, establish the mechanical relationship between the bearing capacity and the damage factor of the steel frame structure, and propose a damage identification method for the damaged steel frame structure.

[0014] Furthermore, in the step of calculating the damage factor of the steel frame structure according to the third damage morphology parameters, fourth damage morphology parameters, and the damage factors of each damaged steel member, the damage factor of the steel frame structure is:

[0015] Wherein, is the damage factor of the steel frame structure, is the number of steel beams, is the number of steel columns, is the th damage factor of the steel beam, is the th damage factor of the steel column, and are the geometric parameter correction coefficients of the steel frame structure system, and a damage model of the steel frame structure is constructed.

[0016] Furthermore, after the step of establishing the mechanical relationship between the bearing capacity and the damage factor of the steel frame structure according to the bearing capacity and the damage factor of the steel frame structure, and proposing a damage identification method for the damaged steel frame structure, the following steps are further included: Use measuring instruments to measure the damage morphology parameters of each steel member on the actually damaged steel frame structure, and calculate the damage factors, remaining load-bearing capacity, and stiffness of the corresponding damaged steel members according to the damage model of the damaged steel members and the damage identification method of the damaged steel members; Based on the damage model of the damaged steel frame structure and the method for identifying the damage of the damaged steel frame structure, the damage factor of the damaged steel frame structure and the remaining bearing capacity of the structure are calculated, and the mechanical properties of the actual damaged steel frame structure are evaluated.

[0017] Another aspect of the present invention relates to a steel frame structure damage identification system based on damage morphology parameters, including: A first acquisition module for performing material property tests on steel materials of different materials under different degrees of damage to obtain the relationship between the degree of damage and the reduction rate of the elastic modulus of the steel; A second acquisition module for performing a loading test on a steel member to obtain the load magnitude, strain gauge reading, displacement reading, and first damage morphology parameter of the steel member under different degrees of damage; A third acquisition module for using a numerical simulation analysis method to establish a finite element analysis model of the steel member, calculating the mechanical properties of the member when the geometric parameters change, and obtaining the bearing capacity, cross-section stress distribution data, member deflection deformation value, and second damage morphology parameter of the steel member under different degrees of damage; A calculation module for calculating the ratio of the undamaged height of the cross-section according to the cross-section strain distribution data; A fourth acquisition module for obtaining the average loading elastic modulus of the damaged cross-section according to the ratio of the undamaged height of the cross-section and the relationship between the degree of damage of the steel and the reduction rate of the elastic modulus; An evaluation module for using the reduction rate of the elastic modulus of the cross-section of the damaged steel member to evaluate the damage factor of the cross-section; A construction module for establishing the mechanical relationship between the damage morphology parameter, bearing capacity, deflection, and damage factor according to the bearing capacity, member deflection deformation value, first damage morphology parameter, and second damage morphology parameter, and combining the damage factor, and constructing a damage model of the damaged steel member expressed by the damage morphology parameter; A judgment module for calculating the damaged steel member damage model to obtain the corresponding remaining bearing capacity and flexural stiffness of the steel member, proposing a method for identifying the damage of the damaged steel member, and judging whether the remaining bearing capacity and stiffness of the steel member after damage can meet the stress requirements.

[0018] Further, in the calculation module, the ratio of the undamaged height of the cross-section is:

[0019] Wherein, is the undamaged height of the cross-section, is the undamaged height of the cross-section, is the height of the cross-section.

[0020] Further, in the fourth acquisition module, the average loading elastic modulus of the damaged cross-section is:

[0021] Among them, is the average loading elastic modulus of the damaged section, is the elastic modulus of the steel after damage, is the cross-sectional area of the member.

[0022] The beneficial effects achieved by the present invention are as follows: The present invention provides a method and system for identifying damage to a steel frame structure based on damage morphology parameters. By conducting material property tests on steel materials of different materials under different degrees of damage, the relationship between the degree of damage and the decrease rate of the elastic modulus of the steel is obtained; loading tests are conducted on steel members to obtain the load magnitude, strain gauge readings, displacement readings, and first damage morphology parameters of the steel members under different degrees of damage; a numerical simulation analysis method is adopted to establish a finite element analysis model of the steel members, calculate the mechanical properties of the members when the geometric parameters change, and obtain the bearing capacity, cross-sectional stress distribution data, member deflection deformation values, and second damage morphology parameters of the steel members under different degrees of damage; according to the cross-sectional strain distribution data, the non-damaged height ratio of the cross-section is calculated; according to the non-damaged height ratio of the cross-section and the relationship between the degree of damage of the steel and the decrease rate of the elastic modulus, the average loading elastic modulus of the damaged cross-section is obtained; the decrease rate of the elastic modulus of the cross-section of the damaged steel member is used to evaluate the cross-section damage factor; according to the bearing capacity, member deflection deformation values, first damage morphology parameters, and second damage morphology parameters, combined with the cross-section damage factor, the mechanical relationship between the damage morphology parameters, bearing capacity, deflection, and damage factor is established, and a damage model of the damaged steel member expressed by the damage morphology parameters is constructed; the damage model of the damaged steel member is calculated to obtain the corresponding remaining bearing capacity and flexural stiffness of the steel member, and a method for identifying damage to the damaged steel member is proposed to determine whether the remaining bearing capacity and stiffness of the steel member after damage can meet the force requirements. The present invention provides a method and system for identifying damage to a steel frame structure based on damage morphology parameters, and the beneficial effects obtained are as follows: 1. Establish the relationship between the appearance damage morphology parameters and mechanical performance indicators of damaged steel materials, damaged cross-sections, damaged members, and damaged steel frame structures. By measuring the appearance damage morphology parameters, the remaining strength and stiffness and other mechanical indicators of the damaged steel frame structure can be analyzed, and the safety and reliability assessment of the damaged steel frame structure can be carried out.

[0023] 2. The existing methods for identifying damage to steel frame structures are applicable to steel frame structures with health monitoring measures. However, ordinary steel frame structures generally do not adopt health monitoring measures in a timely manner when the structure is damaged, and it is also impossible to use the existing damage identification methods for structural safety and reliability assessment. The present invention is applicable to any steel frame structure. The actual damage morphology parameters are very easy to obtain through measurement at the engineering site. By adopting the patented technology of the present invention, the safety and reliability of the damaged structure can be evaluated. Description of the Drawings

[0024] Figure 1 It is a schematic flowchart of the first embodiment of a method for identifying damage to a steel frame structure based on damage morphology parameters according to the present invention; Figure 2 It is a schematic flowchart of the second embodiment of a method for identifying damage to a steel frame structure based on damage morphology parameters according to the present invention. Detailed Embodiment

[0025] In order to better understand the above technical solution, the following will describe the above technical solution in detail in conjunction with the accompanying drawings of the specification and specific embodiments.

[0026] As Figure 1 shown, the first embodiment of the present invention proposes a method for identifying damage to a steel frame structure based on damage morphology parameters, including the following steps: Step S100: Conduct material property tests on steel materials of different materials under different degrees of damage to obtain the relationship between the degree of damage and the reduction rate of the elastic modulus of the steel.

[0027] The reduction rate of the elastic modulus of the steel refers to the degree of reduction of the elastic modulus of the steel after being affected by certain conditions (such as temperature, stress, time, etc.), and is usually expressed as a percentage.

[0028] Step S200: Conduct a loading test on the steel member to obtain the load magnitude, strain gauge reading, displacement reading, and the first damage morphology parameter of the steel member under different degrees of damage.

[0029] Conduct a test on the steel member. During the test, strain gauges and displacement gauges are arranged at the cross-section with the maximum stress of the steel member to measure the strain value and displacement value of the member cross-section under the action of bending moment, shear force, and axial force. Through the loading test, the load magnitude, strain gauge reading, displacement reading, and the damage morphology parameter of the steel member under different degrees of damage are obtained.

[0030] Step S300: Adopt a numerical simulation analysis method to establish a finite element analysis model of the steel member, calculate the mechanical properties of the member when the geometric parameters change, and obtain the bearing capacity, cross-section stress distribution data, member deflection deformation value, and the second damage morphology parameter of the steel member under different degrees of damage.

[0031] Adopt a numerical simulation analysis method to establish a finite element analysis model of the steel member, calculate the mechanical properties of the member when the geometric parameters change, and obtain the bearing capacity, cross-section stress distribution data, member deflection deformation value, and the damage morphology parameter of the member under different degrees of damage.

[0032] Step S400: Calculate the ratio of the undamaged height of the cross-section according to the cross-section strain distribution data.

[0033] Calculate the non-destructive height ratio of the cross-section based on the cross-section strain distribution data in step S200 and step S300.

[0034] Step S500: Obtain the average loading elastic modulus of the damaged cross-section according to the relationship between the non-destructive height ratio of the cross-section and the relationship between the steel damage degree and the elastic modulus degradation rate.

[0035] Obtain the average loading elastic modulus of the damaged cross-section according to the non-destructive height ratio of the cross-section in step S400 and the relationship between the steel damage degree and the elastic modulus degradation rate in step S100.

[0036] Step S600: Use the elastic modulus degradation rate of the damaged steel member cross-section to evaluate the cross-section damage factor.

[0037] The elastic modulus degradation rate of the damaged steel member cross-section is an index used to measure the degree of reduction in the elastic modulus of the steel member after being damaged. The cross-section damage factor is a parameter used to describe the damage degree of the material or structure cross-section.

[0038] Step S700: Based on the bearing capacity, member deflection deformation value, first damage form parameter, and second damage form parameter, combined with the cross-section damage factor, establish the mechanical relationship between the damage form parameter, bearing capacity, deflection, and damage factor, and construct a damage model of the damaged steel member expressed by the damage form parameter.

[0039] Based on the bearing capacity, deflection value, and damage form parameter in step S200 and step S300, combined with the cross-section damage factor in step S600, establish the mechanical relationship between the damage form parameter, bearing capacity, deflection, and damage factor, and construct a damage model of the damaged steel member expressed by the damage form parameter.

[0040] Step S800: Calculate the damaged steel member damage model to obtain the corresponding remaining bearing capacity and flexural stiffness of the steel member, propose a damage identification method for the damaged steel member, and judge whether the remaining bearing capacity and stiffness of the steel member after being damaged can meet the stress requirements.

[0041] By calculating the damage model in S700, the corresponding remaining bearing capacity and flexural stiffness of the steel member can be obtained, and based on this, it can be judged whether the remaining bearing capacity and stiffness of the steel member after being damaged can meet the stress requirements. This method of judging the mechanical properties of the member by the external damage form parameter is called the damage identification method of the damaged steel member.

[0042] Furthermore, see Figure 1 , for a steel frame structure damage identification method based on damage form parameters provided in this embodiment, in step S400, the non-destructive height ratio of the cross-section is: (1) In formula (1), is the non-damaged height of the cross-section, is the non-damaged height of the cross-section, is the height of the cross-section.

[0043] Preferably, referring to Figure 1 , a method for identifying damage to a steel frame structure based on damage morphology parameters provided in this embodiment. According to the relationship between the ratio of the non-damaged height of the cross-section and the degree of steel damage and the reduction rate of the elastic modulus, in step S500, the average loading elastic modulus of the damaged cross-section is: (2) In formula (2), is the average loading elastic modulus of the damaged cross-section, is the elastic modulus of the steel after damage, is the cross-sectional area of the member.

[0044] Furthermore, referring to Figure 1 , a method for identifying damage to a steel frame structure based on damage morphology parameters provided in this embodiment. In the step of using the reduction rate of the elastic modulus of the cross-section of the damaged steel member to evaluate the cross-section damage factor, the cross-section damage factor is: (3) In formula (3), is the cross-section damage factor, is the average loading elastic modulus of the cross-section when the ratio of the non-damaged height of the cross-section is , , is the non-damaged height of the cross-section, is the height of the cross-section; η is the cross-section size correction coefficient, which is determined by the reduction rate of the average loading elastic modulus at full cross-section yield.

[0045] Preferably, referring to Figure 2 , a method for identifying damage to a steel frame structure based on damage morphology parameters provided in this embodiment. After step S800, it further includes: Step S810: Conduct experimental tests on the steel frame structure to obtain the load magnitude, strain gauge readings, displacement values, and the third damage morphology parameters of the steel members and the steel frame structure under different damage degrees.

[0046] Conduct experimental tests on the steel frame structure. During the test, strain gauges are arranged at the cross-sections of the members with the maximum stress in the structure, and displacement gauges are arranged at the parts with the maximum deformation in the structure to obtain the strain distribution data of the dangerous cross-sections of the structure and the deformation values of the structure. Through the loading test, the load magnitude, strain gauge readings, displacement values, and the damage morphology parameters of the steel members and the steel frame structure under different damage degrees are obtained.

[0047] Step S820: Using the numerical simulation analysis method, obtain the bearing capacity, cross-section stress value, cross-section displacement value, and the fourth damage form parameter of the steel frame structure and steel members.

[0048] Using the numerical simulation analysis method, establish a finite element analysis model of the steel frame structure, calculate the mechanical properties of the steel frame structure when geometric parameters change, and obtain the bearing capacity, cross-section stress value, displacement value, and damage form parameters of the steel frame structure and steel members.

[0049] Step S830: According to the cross-section stress value, cross-section displacement value, third damage form parameter, and fourth damage form parameter, and in combination with the cross-section damage factor, calculate the damage factors of each damaged steel member.

[0050] According to the strain value, stress value, displacement value, and damage form parameter of each steel member in Step S810 and Step S820, using the calculation method of the cross-section damage factor of the damaged steel member in Step S600, the damage factors of each damaged steel member can be calculated, and a damage model of the steel frame structure can be constructed.

[0051] Step S840: According to the third damage form parameter, fourth damage form parameter, and the damage factors of each damaged steel member, calculate the damage factor of the steel frame structure.

[0052] According to the load value and damage form parameter in Step S810 and Step S820, and in combination with the damage factors of each steel member in Step S830, a calculation method for the damage factor of the steel frame structure is proposed with the proportion of damaged steel members, damage factor, and structural system parameter correction coefficient as calculation indicators.

[0053] Step S850: According to the bearing capacity and the damage factor of the steel frame structure, establish the mechanical relationship between the bearing capacity and the damage factor of the steel frame structure, and propose a damage identification method for the damaged steel frame structure.

[0054] According to the bearing capacity in Step S810 and Step S820 and the damage factor of the steel frame structure in Step S840, establish the mechanical relationship between the bearing capacity and the damage factor of the steel frame structure, and propose a damage identification method for the damaged steel frame structure. Thus, it is possible to judge whether the remaining bearing capacity of the damaged steel frame structure can meet the stress requirements by calculating the damage factor D_structure of the damaged steel frame structure. This method of judging the mechanical properties of the steel frame structure based on the damage form parameters of the steel members and the steel frame structure is called the damage identification method for the damaged steel frame structure.

[0055] Furthermore, in a damage identification method for a steel frame structure based on damage form parameters provided in this embodiment, in Step S840, the damage factor of the steel frame structure is: (4) In formula (4), is the damage factor of the steel frame structure, is the number of steel beams, is the number of steel columns, is the damage factor of the th steel beam, and are the geometric parameter correction coefficients of the steel frame structure system, and a damage model of the steel frame structure is constructed.

[0056] Preferably, for a steel frame structure damage identification method based on damage morphology parameters provided in this embodiment, after step S850, it further includes: Step S860: Use measuring instruments to measure the damage morphology parameters of each steel member on the actually damaged steel frame structure, and calculate the damage factor, remaining load-bearing capacity, and stiffness of the corresponding damaged steel member according to the damage model of the damaged steel member and the damage identification method of the damaged steel member.

[0057] Use measuring instruments to measure the damage morphology parameters of each steel member on the actually damaged steel frame structure, and calculate the damage factor, remaining load-bearing capacity, and stiffness of the corresponding damaged steel member according to the steel member damage model in step S600 and the damage identification method of the damaged steel member in step S800.

[0058] Step S870: Calculate the damage factor and the remaining load-bearing capacity of the damaged steel frame structure according to the damage model of the damaged steel frame structure and the damage identification method of the damaged steel frame structure, and evaluate the mechanical properties of the actually damaged steel frame structure.

[0059] Calculate the damage factor and the remaining load-bearing capacity of the damaged steel frame structure according to the damage model of the damaged steel frame structure in step S830 and the damage identification method of the steel frame structure in step S840, and evaluate the mechanical properties of the actually damaged steel frame structure.

[0060] Another aspect of the present invention relates to a steel frame structure damage identification system based on damage morphology parameters, including a first acquisition module, a second acquisition module, a third acquisition module, a calculation module, a fourth acquisition module, an evaluation module, a construction module, and a judgment module. Among them, the first acquisition module is used to conduct material property tests on steel materials of different materials under different degrees of damage to obtain the relationship between the degree of damage and the decrease rate of the elastic modulus of the steel; the second acquisition module is used to conduct loading test measurements on steel members to obtain the load magnitude, strain gauge readings, displacement readings, and first damage morphology parameters of the steel members under different degrees of damage; the third acquisition module is used to establish a finite element analysis model of the steel member by using numerical simulation analysis methods, calculate the mechanical properties of the member when the geometric parameters change, and obtain the bearing capacity, cross-section stress distribution data, member deflection deformation value, and second damage morphology parameters of the steel member under different degrees of damage; the calculation module is used to calculate the ratio of the undamaged height of the cross-section according to the cross-section strain distribution data; the fourth acquisition module is used to obtain the average loading elastic modulus of the damaged cross-section according to the ratio of the undamaged height of the cross-section and the relationship between the degree of damage of the steel and the decrease rate of the elastic modulus; the evaluation module is used to evaluate the damage factor of the cross-section by using the decrease rate of the elastic modulus of the cross-section of the damaged steel member; the construction module is used to establish the mechanical relationship between the damage morphology parameters, bearing capacity, deflection, and damage factor according to the bearing capacity, member deflection deformation value, first damage morphology parameter, and second damage morphology parameter, combined with the damage factor, and construct a damage model of the damaged steel member expressed by the damage morphology parameters; the judgment module is used to calculate the damaged steel member damage model to obtain the corresponding remaining bearing capacity and flexural stiffness of the steel member, propose a damage identification method for the damaged steel member, and judge whether the remaining bearing capacity and stiffness of the steel member after damage can meet the force requirements.

[0061] In the first acquisition module, the decrease rate of the elastic modulus of the steel refers to the degree of reduction of the elastic modulus of the steel after being affected by certain conditions (such as temperature, stress, time, etc.), usually expressed as a percentage.

[0062] The second acquisition module conducts test measurements on the steel member. During the test, strain gauges and displacement gauges are arranged at the cross-section where the steel member is subjected to the maximum force to measure the strain values and displacement values of the member cross-section under the action of bending moment, shear force, and axial force. Through the loading test, the load magnitude, strain gauge readings, displacement readings, and damage morphology parameters of the steel member under different degrees of damage are obtained.

[0063] The third acquisition module uses numerical simulation analysis methods to establish a finite element analysis model of the steel member, calculates the mechanical properties of the member when the geometric parameters change, and obtains the bearing capacity, cross-section stress distribution data, member deflection deformation value, and damage morphology parameters of the member under different degrees of damage.

[0064] Calculate the cross-section strain distribution data of the calculation module, and calculate the non-destructive height ratio of the cross-section.

[0065] The fourth acquisition module obtains the average loading elastic modulus of the damaged cross-section according to the relationship between the non-destructive height ratio of the cross-section and the relationship between the steel damage degree and the elastic modulus degradation rate.

[0066] In the evaluation module, the elastic modulus degradation rate of the damaged steel member cross-section is an index used to measure the degree of reduction of the elastic modulus of the steel member after being damaged. The cross-section damage factor is a parameter used to describe the damage degree of the material or structure cross-section.

[0067] The construction module establishes the mechanical relationship between the damage morphology parameters, bearing capacity, deflection, and damage factor according to the bearing capacity, deflection value, damage morphology parameters, and combines the damage factor, and constructs a damage model of the damaged steel member expressed by the damage morphology parameters.

[0068] The judgment module can obtain the corresponding remaining bearing capacity and flexural stiffness of the steel member through the calculation of the damage model, and use this to judge whether the remaining bearing capacity and stiffness of the steel member after being damaged can meet the force requirements. This method of judging the mechanical properties of the member by the external damage morphology parameters is called the damage identification method of the damaged steel member.

[0069] Furthermore, for a steel frame structure damage identification system based on damage morphology parameters provided in this embodiment, in the calculation module, the non-destructive height ratio of the cross-section is: (5) In formula (5), is the non-destructive height of the cross-section, is the non-destructive height of the cross-section, is the cross-section height.

[0070] Furthermore, in the fourth acquisition module, the average loading elastic modulus of the damaged cross-section is: (6) In formula (6), is the average loading elastic modulus of the damaged cross-section, is the elastic modulus of the steel after being damaged, is the cross-sectional area of the member.

[0071] The steel frame structure damage identification method and system based on damage morphology parameters provided by this embodiment, compared with the prior art, obtain the relationship between the damage degree and the decline rate of the elastic modulus of steel by conducting material property tests on steel materials of different materials under different damage degrees; conduct loading tests on steel members to obtain the load magnitude, strain gauge readings, displacement readings, and the first damage morphology parameters of the steel members under different damage degrees; use the numerical simulation analysis method to establish a finite element analysis model of the steel members, calculate the mechanical properties of the members when the geometric parameters change, and obtain the bearing capacity, cross-section stress distribution data, member deflection deformation values, and the second damage morphology parameters of the steel members under different damage degrees; calculate the non-damaged height ratio of the cross-section according to the cross-section strain distribution data; obtain the average loading elastic modulus of the damaged cross-section according to the relationship between the non-damaged height ratio of the cross-section and the relationship between the damage degree of the steel and the decline rate of the elastic modulus; use the decline rate of the elastic modulus of the damaged steel member cross-section to evaluate the cross-section damage factor; establish the mechanical relationship between the damage morphology parameters, bearing capacity, deflection, and damage factor according to the bearing capacity, member deflection deformation values, the first damage morphology parameter, and the second damage morphology parameter, combined with the cross-section damage factor, and construct a damage model of the damaged steel member expressed by the damage morphology parameters; calculate the damage model of the damaged steel member to obtain the corresponding remaining bearing capacity and flexural stiffness of the steel member, and propose a damage identification method for the damaged steel member to judge whether the remaining bearing capacity and stiffness of the steel member after damage can meet the stress requirements. The beneficial effects of the steel frame structure damage identification method and system based on damage morphology parameters provided by this embodiment are as follows: 1. Establish the relationship between the appearance damage morphology parameters and mechanical performance indicators of damaged steel materials, damaged cross-sections, damaged members, and damaged steel frame structures. By measuring the appearance damage morphology parameters, the mechanical indicators such as the remaining strength and stiffness of the damaged steel frame structure can be analyzed, and the safety and reliability of the damaged steel frame structure can be evaluated.

[0072] 2. The existing steel frame structure damage identification methods are applicable to steel frame structures with health monitoring measures. However, ordinary steel frame structures generally do not adopt health monitoring measures. Even if the structure is damaged, the existing damage identification methods cannot be used to evaluate the structural safety and reliability. This embodiment is applicable to any steel frame structure. The actual damage morphology parameters are very easy to obtain by measurement at the engineering site. By using this patented technology, the safety and reliability of the damaged structure can be evaluated.

[0073] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once they learn the basic creative concept. Therefore, the appended claims are intended to be interpreted to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art can make various changes and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A damage identification method for steel frame structure based on damage morphological parameters, characterized in that: The following steps are involved: Material properties tests were conducted on steels of different materials with different degrees of damage to obtain the relationship between the degree of damage and the decrease rate of the elastic modulus of the steel; The steel components are subjected to loading tests to obtain the load magnitude, strain gauge reading, displacement reading and first damage morphology parameter of the steel components at different damage levels; The finite element analysis model of steel components is established by numerical simulation analysis method, and the mechanical properties of components are calculated when the geometric parameters change, so as to obtain the bearing capacity, cross-sectional stress distribution data, component deflection value and second damage morphological parameters of steel components at different damage degrees; Calculating the lossless height ratio of the cross section according to the cross section strain distribution data; According to the relationship between the section intact height ratio and the steel damage degree and the elastic modulus reduction rate, the average loading elastic modulus of the damaged section is obtained; The elastic modulus decrease rate of the damaged steel component section is used to evaluate the section damage factor; According to the bearing capacity, the member deflection deformation value, the first damage morphological parameter and the second damage morphological parameter, combined with the section damage factor, a mechanical relationship among the damage morphological parameter, the bearing capacity, the deflection and the damage factor is established, and a damage model of the damaged steel member expressed by the damage morphological parameter is constructed; The damage model of the damaged steel member is calculated to obtain the corresponding residual bearing capacity and bending stiffness of the steel member, and a damage identification method for the damaged steel member is proposed to determine whether the residual bearing capacity and stiffness of the damaged steel member can meet the force requirements.

2. The steel frame structure damage identification method based on damage morphological parameters according to claim 1 is characterized in that: In the step of calculating the lossless height ratio of the cross section according to the cross section strain distribution data, the lossless height ratio of the cross section is: in, is the lossless height of the cross section, is the lossless height of the cross section, is the section height.

3. The steel frame structure damage identification method based on damage morphological parameters according to claim 1 is characterized in that: In the step of obtaining the average loading elastic modulus of the damaged section according to the relationship between the section intact height ratio and the steel damage degree and the elastic modulus reduction rate, the average loading elastic modulus of the damaged section is: in, is the average loading elastic modulus of the damaged section, is the elastic modulus of the steel after damage, is the cross-sectional area of ​​the component.

4. The steel frame structure damage identification method based on damage morphological parameters according to claim 1, characterized in that: In the step of evaluating the section damage factor by using the elastic modulus decrease rate of the damaged steel member section, the section damage factor is: in, is the cross-sectional damage factor, The lossless height ratio of the cross section is The average cross-sectional loading elastic modulus at , , is the lossless height of the cross section, is the section height; η is the section size correction factor, which is determined by the average loading elastic modulus reduction rate when the entire section yields.

5. The steel frame structure damage identification method based on damage morphological parameters according to claim 1, characterized in that: The damage model of the damaged steel member is calculated to obtain the residual bearing capacity and bending stiffness corresponding to the steel member, a damage identification method for the damaged steel member is proposed, and the step of judging whether the residual bearing capacity and stiffness of the damaged steel member can meet the force requirements also includes: The steel frame structure was tested to obtain the load size, strain gauge reading, displacement value, and third damage morphological parameters of the steel member and the steel frame structure under different damage degrees; The bearing capacity, section stress value, section displacement value, and fourth damage form parameters of steel components and steel frame structures are obtained by numerical simulation analysis method; Calculate the damage factor of each damaged steel member according to the section stress value, the section displacement value, the third damage morphology parameter and the fourth damage morphology parameter in combination with the section damage factor; Calculating a steel frame structure damage factor according to the third damage morphology parameter, the fourth damage morphology parameter and the damage factor of each damaged steel member; According to the bearing capacity and the damage factor of the steel frame structure, a mechanical relationship between the bearing capacity of the steel frame structure and the damage factor is established, and a damage identification method for a damaged steel frame structure is proposed.

6. The steel frame structure damage identification method based on damage morphological parameters according to claim 5, characterized in that: In the step of calculating the damage factor of the steel frame structure according to the third damage morphological parameter, the fourth damage morphological parameter and the damage factor of each damaged steel member, the damage factor of the steel frame structure is: in, is the damage factor of the steel frame structure, is the number of steel beams, is the number of steel columns, For the The damage factor of the steel beam is For the The damage factor of the steel column is and The geometric parameter correction coefficient of the steel frame structure system is used to construct a damage model of the steel frame structure.

7. The steel frame structure damage identification method based on damage morphological parameters according to claim 5, characterized in that: According to the bearing capacity and the damage factor of the steel frame structure, a mechanical relationship between the bearing capacity of the steel frame structure and the damage factor is established, and after the step of proposing a method for identifying damage to a damaged steel frame structure, the method further includes: Using a measuring instrument to measure the damage morphological parameters of each steel member on the actual damaged steel frame structure, and according to the damage model of the damaged steel member and the damage identification method of the damaged steel member, calculating the damage factor, residual bearing capacity and stiffness of the corresponding damaged steel member; According to the damaged steel frame structure damage model and the damaged steel frame structure damage identification method, the damage factor and the structural residual bearing capacity of the damaged steel frame structure are calculated, and the mechanical properties of the actual damaged steel frame structure are evaluated.

8. A steel frame structure damage identification system based on damage morphological parameters, characterized in that: include: The first acquisition module is used to perform material property tests on steels of different materials with different degrees of damage to obtain the relationship between the degree of damage and the decrease rate of the elastic modulus of the steel; The second acquisition module is used to perform a loading test on the steel component to obtain the load size, strain gauge reading, displacement reading and first damage morphology parameter of the steel component at different damage degrees; The third acquisition module is used to establish a finite element analysis model of the steel component by using a numerical simulation analysis method, calculate the mechanical properties of the component when the geometric parameters change, and obtain the bearing capacity, cross-sectional stress distribution data, component deflection deformation value and second damage morphological parameter of the steel component at different damage degrees; A calculation module, used for calculating the lossless height ratio of the cross section according to the cross section strain distribution data; A fourth acquisition module is used to obtain an average loading elastic modulus of the damaged section according to the relationship between the section intact height ratio and the steel damage degree and the elastic modulus reduction rate; An evaluation module is used to evaluate the damage factor of a section by using the elastic modulus reduction rate of the damaged steel member section; A construction module is used to establish a mechanical relationship between the damage morphological parameter, the bearing capacity, the deflection and the damage factor according to the bearing capacity, the member deflection deformation value, the first damage morphological parameter and the second damage morphological parameter, and to construct a damage model of the damaged steel member expressed by the damage morphological parameter in combination with the damage factor; The judgment module is used to calculate the damage model of the damaged steel member, obtain the corresponding residual bearing capacity and bending stiffness of the steel member, propose a damage identification method for the damaged steel member, and judge whether the residual bearing capacity and stiffness of the damaged steel member can meet the force requirements.

9. The steel frame structure damage identification system based on damage morphological parameters according to claim 8, characterized in that: In the calculation module, the cross-section lossless height ratio is: in, is the lossless height of the cross section, is the lossless height of the cross section, is the section height.

10. The steel frame structure damage identification system based on damage morphological parameters according to claim 8, characterized in that: In the fourth acquisition module, the average loading elastic modulus of the damaged section is: in, is the average loading elastic modulus of the damaged section, is the elastic modulus of the steel after damage, is the cross-sectional area of ​​the component.

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