A method and system for damage identification of steel frame structures based on damage morphology parameters
By conducting material property tests and loading tests on steel, establishing a finite element analysis model, calculating damage morphological parameters, and constructing a damage model, the problem of damage identification in steel frame structures without health monitoring measures was solved, and the assessment of their damage degree and safety was achieved.
Patent Information
- Application Number
- CN202510305701.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2045-03-14
AI Technical Summary
Existing methods for identifying damage to steel frame structures mainly rely on sensors to obtain mechanical parameter information, which cannot be applied to steel frame structures without health monitoring measures, making it difficult to assess their degree of damage and safety reliability.
By conducting material property tests and loading tests on steel of different materials, a finite element analysis model is established, damage morphology parameters are calculated, a damage model is constructed, and the remaining load-bearing capacity and stiffness of steel components and steel frame structures are evaluated.
It can evaluate the damage degree and safety reliability of steel frame structures without health monitoring measures, analyze their residual strength and stiffness through appearance damage morphology parameters, and provide safety and reliability assessment.
Smart Images
Figure CN120180227B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of steel frame structure damage detection technology, and in particular discloses a method and system for steel frame structure damage identification based on damage morphology parameters. Background Technology
[0002] Damage leads to a degradation in the strength and stiffness of steel, resulting in reduced load-bearing capacity and increased deformation in damaged sections, components, nodes, and structures, thus affecting the safe and normal use of steel frame structures. The higher the degree of damage, the more severe the degradation in strength and stiffness. Existing methods for identifying damage in steel frame structures typically involve installing several sensors on the steel frame structure to acquire structural response data. This data is then analyzed to determine the extent of damage. A basic schematic diagram is shown below. Existing methods for identifying damage in steel frame structures are well-suited for structures that have undergone health monitoring measures.
[0003] However, in actual engineering applications, most steel frame structures do not take health monitoring measures, and it is impossible to obtain relevant mechanical parameter information before and after structural damage. Therefore, existing structural damage identification methods are difficult to apply to judging the actual degree of damage of most steel frame structures without health monitoring measures.
[0004] Therefore, the aforementioned defects in existing structural damage identification methods are technical problems that urgently need to be solved. Summary of the Invention
[0005] This invention provides a method and system for identifying damage in steel frame structures based on damage morphology parameters, aiming to solve at least one defect in the existing structural damage identification methods.
[0006] One aspect of the present invention relates to a damage identification method for steel frame structures based on damage morphology parameters, comprising the following steps:
[0007] Material property tests were conducted on steels of different materials under different degrees of damage to obtain the relationship between the degree of damage and the rate of decrease in the elastic modulus of the steel.
[0008] Loading tests were conducted on the steel components to obtain the load magnitude, strain gauge readings, displacement readings, and first damage mode parameters of the steel components under different damage levels.
[0009] Numerical simulation analysis method is used to establish a finite element analysis model of steel components, and the mechanical properties of the components are calculated when the geometric parameters change. The bearing capacity, cross-sectional stress distribution data, component deflection deformation value and second damage mode parameters of steel components under different damage degrees are obtained.
[0010] The ratio of the undamaged height of the cross section is calculated based on the cross-sectional strain distribution data.
[0011] The average loaded elastic modulus of the damaged section is obtained based on the relationship between the ratio of undamaged section height and the degree of steel damage and the rate of decrease in elastic modulus.
[0012] The rate of decrease in the elastic modulus of the damaged steel component section is used to evaluate the section damage factor;
[0013] Based on the bearing capacity, component deflection deformation value, first damage mode parameter and second damage mode parameter, combined with the section damage factor, the mechanical relationship between damage mode parameter, bearing capacity, deflection and damage factor is established, and a damage model of damaged steel component expressed by damage mode parameter is constructed.
[0014] Damage models of damaged steel components are calculated to obtain the remaining bearing capacity and bending stiffness of the steel components. A damage identification method for damaged steel components is proposed to determine whether the remaining bearing capacity and stiffness of the steel components after damage can meet the stress requirements.
[0015] Furthermore, in the step of calculating the non-destructive height ratio of the cross-section based on the cross-sectional strain distribution data, the non-destructive height ratio of the cross-section is:
[0016]
[0017] in, The height of the cross-section without damage. The height of the cross-section without damage. This represents the cross-sectional height.
[0018] Furthermore, in the step of obtaining the average loaded elastic modulus of the damaged section based on the relationship between the ratio of the undamaged section height and the degree of steel damage and the rate of decrease in elastic modulus, the average loaded elastic modulus of the damaged section is:
[0019]
[0020] in, The average loaded elastic modulus of the damaged section. The elastic modulus of the steel after it is damaged. Let be the cross-sectional area of the component.
[0021] Furthermore, in the step of evaluating the section damage factor using the rate of decrease in the elastic modulus of the damaged steel member section, the section damage factor is:
[0022]
[0023] in, For cross-sectional damage factor, The ratio of the undamaged height of the cross section is The average modulus of elasticity of the cross section under load at that time. , The height of the cross-section without damage. η is the cross-sectional height; η is the cross-sectional size correction factor, which is determined by the rate of decrease in the average loaded elastic modulus when the entire cross-section yields.
[0024] Furthermore, the damage model of the damaged steel component is calculated to obtain the remaining bearing capacity and bending stiffness of the steel component. A damage identification method for the damaged steel component is proposed. After determining whether the remaining bearing capacity and stiffness of the damaged steel component can meet the stress requirements, the following steps are also included:
[0025] Experimental tests were conducted on the steel frame structure to obtain the load magnitude, strain gauge readings, displacement values, and third damage mode parameters of the steel components and the steel frame structure under different damage levels.
[0026] Numerical simulation analysis was used to obtain the bearing capacity, section stress value, section displacement value, and fourth damage mode parameters of steel components and steel frame structure.
[0027] Based on the cross-sectional stress value, cross-sectional displacement value, third damage mode parameter and fourth damage mode parameter, combined with the cross-sectional damage factor, the damage factor of each damaged steel component is calculated.
[0028] The damage factor of the steel frame structure is calculated based on the third damage morphology parameter, the fourth damage morphology parameter, and the damage factor of each damaged steel component.
[0029] Based on the bearing capacity and damage factor of steel frame structures, a mechanical relationship between the bearing capacity and damage factor of steel frame structures is established, and a damage identification method for damaged steel frame structures is proposed.
[0030] Furthermore, in the step of calculating the damage factor of the steel frame structure based on the third damage morphology parameter, the fourth damage morphology parameter, and the damage factor of each damaged steel component, the damage factor of the steel frame structure is:
[0031]
[0032] in, For steel frame structure damage factors, The number of steel beams, The number of steel columns, For the first Damage factors of steel beams For the first Damage factors of steel columns and We use the geometric parameter correction coefficients of the steel frame structure system to construct a damage model for the steel frame structure.
[0033] Furthermore, after establishing the mechanical relationship between the bearing capacity and damage factor of the steel frame structure based on the bearing capacity and damage factor, and proposing a damage identification method for the damaged steel frame structure, the following steps are also included:
[0034] The damage morphology parameters of each steel component on the actual damaged steel frame structure are measured using measuring instruments. Based on the damage model of the damaged steel component and the damage identification method of the damaged steel component, the damage factor, remaining bearing capacity and stiffness of the corresponding damaged steel component are calculated.
[0035] Based on the damage model and damage identification method of the damaged steel frame structure, the damage factor and remaining load-bearing capacity of the damaged steel frame structure are calculated, and the mechanical performance of the actual damaged steel frame structure is evaluated.
[0036] Another aspect of the present invention relates to a damage identification system for steel frame structures based on damage morphology parameters, comprising:
[0037] The first acquisition module is used to conduct material property tests on steel of different materials under different degrees of damage to obtain the relationship between the degree of damage and the rate of decrease in the elastic modulus of the steel.
[0038] The second acquisition module is used to perform loading tests on steel components to obtain the load magnitude, strain gauge readings, displacement readings and first damage mode parameters of steel components under different damage levels.
[0039] The third acquisition module is used to establish a finite element analysis model of the steel component using numerical simulation analysis methods, 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 mode parameters of the steel component under different damage degrees.
[0040] The calculation module is used to calculate the non-destructive height ratio of the cross section based on the cross section strain distribution data;
[0041] The fourth acquisition module is used to obtain the average loaded elastic modulus of the damaged section based on the relationship between the ratio of the undamaged section height and the degree of steel damage and the rate of decrease in elastic modulus.
[0042] The evaluation module is used to evaluate the damage factor of a section by the rate of decrease in the elastic modulus of the damaged steel component section.
[0043] The construction module is used to establish the mechanical relationship between the damage morphology parameters, bearing capacity, deflection value, first damage morphology parameter and second damage morphology parameter, combined with damage factor, based on bearing capacity, component deflection deformation value, first damage morphology parameter and second damage morphology parameter, and to construct a damage model of the damaged steel component expressed by damage morphology parameters.
[0044] The judgment module is used to calculate the damage model of the damaged steel component, obtain the remaining bearing capacity and bending stiffness of the steel component, propose a damage identification method for the damaged steel component, and determine whether the remaining bearing capacity and stiffness of the steel component after damage can meet the stress requirements.
[0045] Furthermore, in the calculation module, the ratio of the non-destructive height of the cross-section is:
[0046]
[0047] in, The height of the cross-section without damage. The height of the cross-section without damage. This represents the cross-sectional height.
[0048] Furthermore, in the fourth acquisition module, the average loaded elastic modulus of the damaged section is:
[0049]
[0050] in, The average loaded elastic modulus of the damaged section. The elastic modulus of the steel after it is damaged. Let be the cross-sectional area of the component.
[0051] The beneficial effects achieved by this invention are as follows:
[0052] This invention provides a damage identification method and system for steel frame structures based on damage morphology parameters. By conducting material property tests on steel of different materials at different damage levels, the relationship between the damage level and the rate of decrease in the steel's elastic modulus is obtained. Loading tests are performed on steel components to obtain the load magnitude, strain gauge readings, displacement readings, and first damage morphology parameters under different damage levels. A finite element analysis model of the steel component is established using numerical simulation analysis to calculate the mechanical properties of the component when geometric parameters change, obtaining the bearing capacity, cross-sectional stress distribution data, component deflection deformation value, and second damage morphology parameters of the steel component under different damage levels. Based on the cross-sectional strain distribution data, the ratio of the undamaged height to the cross-section is calculated. Based on the relationship between the ratio of undamaged section height and the degree of steel damage and the rate of decrease in elastic modulus, the average loaded elastic modulus of the damaged section is obtained. The rate of decrease in elastic modulus of the damaged steel member section is used to evaluate the section damage factor. Based on the bearing capacity, member deflection deformation value, first damage morphology parameter, and second damage morphology parameter, combined with the section damage factor, the mechanical relationship between damage morphology parameter, bearing capacity, deflection, and damage factor is established, and a damage model of the damaged steel member expressed by damage morphology 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. A damage identification method for damaged steel members is proposed to determine whether the residual bearing capacity and stiffness of the damaged steel member can meet the stress requirements. This invention provides a damage identification method and system for steel frame structures based on damage morphology parameter, and the beneficial effects are as follows:
[0053] 1. Establish the relationship between the appearance damage morphology parameters and mechanical performance indicators of damaged steel, damaged sections, damaged components 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 of the damaged steel frame structure can be assessed.
[0054] 2. Existing damage identification methods for steel frame structures are applicable to steel frame structures with health monitoring measures. However, ordinary steel frame structures generally do not have health monitoring measures in place, and in the event of structural damage, existing damage identification methods cannot be used to assess structural safety and reliability. This invention is applicable to any steel frame structure. Actual damage morphology parameters are very easy to obtain through measurement on-site. Using this patented technology, the safety and reliability of damaged structures can be assessed. Attached Figure Description
[0055] Figure 1 This is a flowchart illustrating the first embodiment of a damage identification method for steel frame structures based on damage morphology parameters according to the present invention.
[0056] Figure 2This is a flowchart illustrating the second embodiment of a damage identification method for steel frame structures based on damage morphology parameters according to the present invention. Detailed Implementation
[0057] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.
[0058] like Figure 1 As shown, the first embodiment of the present invention proposes a damage identification method for steel frame structures based on damage morphology parameters, including the following steps:
[0059] Step S100: Conduct material property tests on steel of different materials with different degrees of damage to obtain the relationship between the degree of damage and the rate of decrease in the elastic modulus of the steel.
[0060] The rate of decrease in the elastic modulus of steel refers to the degree to which the elastic modulus of steel decreases after being affected by certain conditions (such as temperature, stress, time, etc.), and is usually expressed as a percentage.
[0061] Step S200: Perform a loading test on the steel component to obtain the load magnitude, strain gauge readings, displacement readings, and first damage mode parameters of the steel component under different damage levels.
[0062] The steel components were tested. During the tests, strain gauges and displacement gauges were placed at the cross-sections of the steel components with the highest stress to measure the strain and displacement values of the cross-sections under bending moment, shear force, and axial force. Through loading tests, the load magnitude, strain gauge readings, displacement readings, and damage mode parameters of the steel components under different degrees of damage were obtained.
[0063] Step S300: Using numerical simulation analysis, a finite element analysis model of the steel component is established, and the mechanical properties of the component are calculated when the geometric parameters change. The bearing capacity, cross-sectional stress distribution data, component deflection deformation value and second damage mode parameters of the steel component under different damage degrees are obtained.
[0064] Numerical simulation analysis was used to establish a finite element analysis model of the steel component. The mechanical properties of the component were calculated when the geometric parameters changed, and the bearing capacity, cross-sectional stress distribution data, component deflection deformation value and damage morphology parameters of the component under different damage degrees were obtained.
[0065] Step S400: Calculate the non-destructive height ratio of the cross section based on the cross section strain distribution data.
[0066] Based on the cross-sectional strain distribution data in steps S200 and S300, the non-destructive height ratio of the cross-section is calculated.
[0067] Step S500: Based on the relationship between the ratio of undamaged section height and the degree of steel damage and the rate of decrease in elastic modulus, obtain the average loaded elastic modulus of the damaged section.
[0068] Based on the relationship between the undamaged section height ratio in step S400 and the steel damage degree and elastic modulus reduction rate in step S100, the average loaded elastic modulus of the damaged section is obtained.
[0069] Step S600: Use the rate of decrease in the elastic modulus of the damaged steel component section to evaluate the section damage factor.
[0070] The rate of decrease in the elastic modulus of a damaged steel component section is an indicator used to measure the degree of reduction in the elastic modulus of a steel component after it has been damaged. The section damage factor is a parameter used to describe the degree of damage to a material or structural section.
[0071] Step S700: Based on the bearing capacity, component deflection deformation value, first damage mode parameter and second damage mode parameter, combined with the section damage factor, establish the mechanical relationship between damage mode parameter, bearing capacity, deflection and damage factor, and construct a damage model of the damaged steel component expressed by damage mode parameter.
[0072] Based on the bearing capacity, deflection value, and damage morphology parameters in steps S200 and S300, and combined with the cross-sectional damage factor in step S600, the mechanical relationship between damage morphology parameters, bearing capacity, deflection, and damage factor is established, and a damage model of the damaged steel component expressed by damage morphology parameters is constructed.
[0073] Step S800: Calculate the damage model of the damaged steel component to obtain the remaining bearing capacity and bending stiffness of the steel component, propose a damage identification method for the damaged steel component, and determine whether the remaining bearing capacity and stiffness of the steel component after damage can meet the stress requirements.
[0074] By calculating the damage model in S700, the remaining load-bearing capacity and bending stiffness of the steel component can be obtained, thereby determining whether the remaining load-bearing capacity and stiffness of the damaged steel component can meet the stress requirements. This method of judging the mechanical properties of a component based on external damage morphology parameters is called the damage identification method for damaged steel components.
[0075] Further, please see Figure 1 This embodiment provides a damage identification method for steel frame structures based on damage morphology parameters. In step S400, the ratio of the undamaged height of the cross-section is:
[0076] (1)
[0077] In formula (1), The height of the cross-section without damage. The height of the cross-section without damage. This represents the cross-sectional height.
[0078] Preferably, see Figure 1 This embodiment provides a damage identification method for steel frame structures based on damage morphology parameters. According to the relationship between the ratio of undamaged section height and the degree of steel damage and the rate of decrease in elastic modulus, in step S500, the average loaded elastic modulus of the damaged section is:
[0079] (2)
[0080] In formula (2), The average loaded elastic modulus of the damaged section. The elastic modulus of the steel after it is damaged. Let be the cross-sectional area of the component.
[0081] Further, please see Figure 1 This embodiment provides a damage identification method for steel frame structures based on damage morphology parameters. In the step of evaluating the cross-sectional damage factor using the rate of decrease in the elastic modulus of the damaged steel member cross-section, the cross-sectional damage factor is:
[0082] (3)
[0083] In formula (3), For cross-sectional damage factor, The ratio of the undamaged height of the cross section is The average modulus of elasticity of the cross section under load at that time. , The height of the cross-section without damage. η is the cross-sectional height; η is the cross-sectional size correction factor, which is determined by the rate of decrease in the average loaded elastic modulus when the entire cross-section yields.
[0084] Preferably, please see Figure 2 This embodiment provides a damage identification method for steel frame structures based on damage morphology parameters, which further includes the following after step S800:
[0085] Step S810: Conduct tests on the steel frame structure to obtain the load magnitude, strain gauge readings, displacement values, and third damage mode parameters of the steel components and the steel frame structure under different damage levels.
[0086] Experimental tests were conducted on the steel frame structure. During the tests, strain gauges were placed at the cross-sections of the structural members subjected to the greatest stress, and displacement gauges were placed at the locations of the greatest structural deformation to obtain strain distribution data and deformation values at the critical sections of the structure. Through loading tests, the load magnitude, strain gauge readings, displacement values, and damage morphology parameters of the steel members and the steel frame structure under different degrees of damage were obtained.
[0087] Step S820: Using numerical simulation analysis, the bearing capacity, section stress value, section displacement value, and fourth damage mode parameters of the steel frame structure are obtained.
[0088] Numerical simulation analysis was used to establish a finite element analysis model of the steel frame structure. The mechanical properties of the steel frame structure were calculated when the geometric parameters changed, and the bearing capacity, section stress value, displacement value, and damage mode parameters of the steel components and the steel frame structure were obtained.
[0089] Step S830: Based on the cross-sectional stress value, cross-sectional displacement value, third damage mode parameter and fourth damage mode parameter, combined with the cross-sectional damage factor, calculate the damage factor of each damaged steel component.
[0090] Based on the strain, stress, displacement, and damage morphology parameters of each steel component in steps S810 and S820, the damage factor of each damaged steel component can be calculated using the damage factor calculation method for the damaged steel component section in step S600, thus constructing a damage model for the steel frame structure.
[0091] Step S840: Calculate the damage factor of the steel frame structure based on the third damage morphology parameter, the fourth damage morphology parameter, and the damage factor of each damaged steel component.
[0092] Based on the load values and damage morphology parameters in steps S810 and S820, and combined with the damage factors of each steel component in step S830, a method for calculating the damage factor of steel frame structures is proposed, using the proportion of damaged steel components, damage factor, and structural system parameter correction coefficient as calculation indicators.
[0093] Step S850: Based on 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.
[0094] Based on the bearing capacity in steps S810 and S820 and the damage factor of the steel frame structure in step S840, a mechanical relationship between the bearing capacity and the damage factor of the steel frame structure is established, and a damage identification method for damaged steel frame structures is proposed. Therefore, by calculating the damage factor D of the damaged steel frame structure, it can be determined whether the remaining bearing capacity of the damaged steel frame structure can meet the stress requirements. This method of judging the mechanical performance of steel frame structures based on the damage morphology parameters of steel components and steel frame structures is called the damage identification method for damaged steel frame structures.
[0095] Furthermore, in the damage identification method for steel frame structures based on damage morphology parameters provided in this embodiment, the damage factor of the steel frame structure in step S840 is:
[0096] (4)
[0097] In formula (4), For steel frame structure damage factors, The number of steel beams, The number of steel columns, For the first Damage factors of steel beams For the first Damage factors of steel columns and We use the geometric parameter correction coefficients of the steel frame structure system to construct a damage model for the steel frame structure.
[0098] Preferably, the damage identification method for steel frame structures based on damage morphology parameters provided in this embodiment further includes the following after step S850:
[0099] Step S860: Use measuring instruments to measure the damage morphology parameters of each steel component on the actual damaged steel frame structure. Based on the damage model of the damaged steel component and the damage identification method of the damaged steel component, calculate the damage factor, remaining bearing capacity and stiffness of the corresponding damaged steel component.
[0100] The damage morphology parameters of each steel component on the actual damaged steel frame structure are measured using measuring instruments. Based on the steel component damage model in step S600 and the damage identification method of the damaged steel component in step S800, the damage factor, remaining bearing capacity and stiffness of the corresponding damaged steel component are calculated.
[0101] Step S870: Based on the damage model and damage identification method of the damaged steel frame structure, calculate the damage factor and remaining load-bearing capacity of the damaged steel frame structure, and evaluate the mechanical performance of the actual damaged steel frame structure.
[0102] Based on 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, the damage factor and remaining load-bearing capacity of the damaged steel frame structure are calculated, and the mechanical performance of the actual damaged steel frame structure is evaluated.
[0103] Another aspect of the present invention relates to a damage identification system for steel frame structures based on damage morphology parameters, comprising 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. The first acquisition module is used to conduct material property tests on steel of different materials at different degrees of damage to obtain the relationship between the degree of damage and the rate of decrease in the elastic modulus of the steel. The second acquisition module is used to conduct loading tests on steel components to obtain the load magnitude, strain gauge readings, displacement readings, and first damage morphology parameters of the steel components under different degrees of damage. The third acquisition module is used to establish a finite element analysis model of the steel components using numerical simulation analysis methods, calculate the mechanical properties of the components when geometric parameters change, and obtain the bearing capacity, cross-sectional stress distribution data, component deflection deformation value, and second damage morphology parameters of the steel components under different degrees of damage. The system comprises four modules: a calculation module for calculating the undamaged height ratio of a cross-section based on cross-sectional strain distribution data; a fourth acquisition module for obtaining the average loaded elastic modulus of the damaged cross-section based on the relationship between the undamaged height ratio and the degree of steel damage and the rate of decrease in elastic modulus; an evaluation module for evaluating the damage factor of the cross-section using the rate of decrease in elastic modulus of the damaged steel member; a construction module for establishing the mechanical relationship between damage morphology parameters, bearing capacity, deflection, and damage factor based on bearing capacity, member deflection deformation value, first damage morphology parameter, second damage morphology parameter, and damage factor, and constructing a damage model of the damaged steel member expressed by damage morphology parameters; and a judgment module for calculating the damage model of the damaged steel member, obtaining the corresponding residual bearing capacity and bending stiffness of the steel member, proposing a damage identification method for the damaged steel member, and judging whether the residual bearing capacity and stiffness of the damaged steel member can meet the stress requirements.
[0104] In the first acquisition module, the reduction rate of the elastic modulus of steel refers to the degree to which the elastic modulus of steel decreases after being affected by certain conditions (such as temperature, stress, time, etc.), and is usually expressed as a percentage.
[0105] The second acquisition module conducts tests on the steel components. During the tests, strain gauges and displacement gauges are placed at the cross-section of the steel component with the greatest stress to measure the strain and displacement values of the component section under bending moment, shear force, and axial force. Through loading tests, the load magnitude, strain gauge readings, displacement readings, and damage morphology parameters of the steel components under different degrees of damage are obtained.
[0106] The third acquisition module uses numerical simulation analysis to establish a finite element analysis model of the steel component, calculates the mechanical properties of the component when the geometric parameters change, and obtains the bearing capacity, cross-sectional stress distribution data, component deflection deformation value and damage morphology parameters of the component under different damage degrees.
[0107] The strain distribution data of the module section is calculated to determine the non-destructive height ratio of the section.
[0108] The fourth acquisition module obtains the average loaded elastic modulus of the damaged section based on the relationship between the ratio of the undamaged height of the cross section and the degree of steel damage and the rate of decrease in elastic modulus.
[0109] In the evaluation module, the rate of decrease in the elastic modulus of a damaged steel component section is an indicator used to measure the degree of reduction in the elastic modulus of a steel component after it has been damaged. The section damage factor is a parameter used to describe the degree of damage to a material or structural section.
[0110] The construction module establishes the mechanical relationship between the damage morphology parameters, bearing capacity, deflection, and damage factor based on the bearing capacity, deflection value, and damage morphology parameters, and constructs a damage model of the damaged steel component expressed by the damage morphology parameters.
[0111] The assessment module calculates the remaining load-bearing capacity and bending stiffness of the steel component based on the damage model, thereby determining whether the remaining load-bearing capacity and stiffness of the damaged steel component can meet the stress requirements. This method of judging the mechanical properties of a component based on external damage morphology parameters is called the damage identification method for damaged steel components.
[0112] Furthermore, in the damage identification system for steel frame structures based on damage morphology parameters provided in this embodiment, the ratio of the undamaged height of the cross-section in the calculation module is:
[0113] (5)
[0114] In formula (5), The height of the cross-section without damage. The height of the cross-section without damage. This represents the cross-sectional height.
[0115] Furthermore, in the fourth acquisition module, the average loaded elastic modulus of the damaged section is:
[0116] (6)
[0117] In formula (6), The average loaded elastic modulus of the damaged section. The elastic modulus of the steel after it is damaged. Let be the cross-sectional area of the component.
[0118] The damage identification method and system for steel frame structures based on damage morphology parameters provided in this embodiment, compared with the prior art, obtains the relationship between the degree of damage and the rate of decrease in the elastic modulus of steel by conducting material property tests on steel of different materials with different degrees of damage; load tests are conducted on steel components to obtain the load magnitude, strain gauge readings, displacement readings, and first damage morphology parameters of the steel components under different degrees of damage; a finite element analysis model of the steel components is established using numerical simulation analysis methods to calculate the mechanical properties of the components when the geometric parameters change, obtaining the bearing capacity, cross-sectional stress distribution data, component deflection deformation value, and second damage morphology parameters of the steel components under different degrees of damage; and the undamaged height of the cross-section is calculated based on the cross-sectional strain distribution data. The method involves several steps: First, the ratio of the undamaged section height to the undamaged section height is used. Second, the relationship between the degree of steel damage and the rate of decrease in the elastic modulus is established. Third, the rate of decrease in the elastic modulus of the damaged steel member section is used to evaluate the section damage factor. Fourth, based on the bearing capacity, member deflection deformation value, first damage morphology parameter, and second damage morphology parameter, combined with the section damage factor, a mechanical relationship is established between the damage morphology parameter, bearing capacity, deflection, and damage factor, constructing a damage model of the damaged steel member expressed by the damage morphology parameter. Fifth, the damage model of the damaged steel member is calculated to obtain the corresponding residual bearing capacity and bending stiffness of the steel member. 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 stress requirements. The beneficial effects of the damage identification method and system for steel frame structures based on damage morphology parameters provided in this embodiment are as follows:
[0119] 1. Establish the relationship between the appearance damage morphology parameters and mechanical performance indicators of damaged steel, damaged sections, damaged components 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 of the damaged steel frame structure can be assessed.
[0120] 2. Existing damage identification methods for steel frame structures are applicable to steel frame structures with health monitoring measures. However, ordinary steel frame structures generally do not have health monitoring measures, and even if the structure is damaged, existing damage identification methods cannot be used to assess its structural safety and reliability. This embodiment is applicable to any steel frame structure. The actual damage morphology parameters are very easy to obtain through measurement on-site. Using this patented technology, the safety and reliability of damaged structures can be assessed.
[0121] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if these modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include these modifications and modifications.
Claims
1. A method for damage identification of steel frame structures based on damage morphology parameters, characterized in that, The following steps are involved: Material property tests were conducted on steels of different materials under different degrees of damage to obtain the relationship between the degree of damage and the rate of decrease in the elastic modulus of the steel. Loading tests were conducted on the steel components to obtain the load magnitude, strain gauge readings, displacement readings, and first damage mode parameters of the steel components under different damage levels. Numerical simulation analysis method is used to establish a finite element analysis model of steel components, and the mechanical properties of the components are calculated when the geometric parameters change. The bearing capacity, cross-sectional strain distribution data, component deflection deformation value and second damage mode parameters of steel components under different damage degrees are obtained. Based on the strain distribution data of the cross section, the ratio of the undamaged height of the cross section is calculated; The average loaded elastic modulus of the damaged section is obtained based on the relationship between the undamaged height ratio of the cross section and the degree of damage to the steel and the rate of decrease in elastic modulus. The rate of decrease in the elastic modulus of the damaged steel component section is used to evaluate the section damage factor; Based on the bearing capacity, the component deflection value, the first damage morphology parameter and the second damage morphology parameter, and combined with the cross-sectional damage factor, a mechanical relationship between the damage morphology parameter, bearing capacity, deflection and damage factor is established, and a damage model of the damaged steel component expressed by the damage morphology parameter is constructed. The damage model of the damaged steel component is calculated to obtain the remaining bearing capacity and bending stiffness of the steel component. A damage identification method for the damaged steel component is proposed to determine whether the remaining bearing capacity and stiffness of the steel component after damage can meet the stress requirements. Experimental tests were conducted on the steel frame structure to obtain the load magnitude, strain gauge readings, displacement values, and third damage mode parameters of the steel components and the steel frame structure under different damage levels. Numerical simulation analysis was used to obtain the bearing capacity, cross-sectional strain value, cross-sectional displacement value, and fourth damage mode parameters of steel members and steel frame structure. Based on the cross-sectional strain value, the cross-sectional displacement value, the third damage mode parameter, and the fourth damage mode parameter, combined with the cross-sectional damage factor, the damage factor of each damaged steel component is calculated. The damage factor of the steel frame structure is calculated based on the third damage morphology parameter, the fourth damage morphology parameter, and the damage factor of each damaged steel component. Based on the bearing capacity and the damage factor of the steel frame structure, a mechanical relationship between the bearing capacity and the damage factor of the steel frame structure is established, and a damage identification method for damaged steel frame structures is proposed.
2. The damage identification method for steel frame structures based on damage morphology parameters as described in claim 1, characterized in that, In the step of calculating the non-destructive height ratio of the cross-section based on the cross-sectional strain distribution data, the non-destructive height ratio of the cross-section is: in, The height of the cross-section without damage. The height of the cross-section without damage. This represents the cross-sectional height.
3. The damage identification method for steel frame structures based on damage morphology parameters as described in claim 1, characterized in that, In the step of obtaining the average loaded elastic modulus of the damaged section based on the relationship between the undamaged height ratio of the cross section and the degree of steel damage and the rate of decrease in elastic modulus, the average loaded elastic modulus of the damaged section is: in, The average loaded elastic modulus of the damaged section. The elastic modulus of the steel after it is damaged. Let be the cross-sectional area of the component.
4. The damage identification method for steel frame structures based on damage morphology parameters as described in claim 1, characterized in that, In the step of evaluating the section damage factor using the rate of decrease in the elastic modulus of the damaged steel member section, the section damage factor is: in, For cross-sectional damage factor, The ratio of the undamaged height of the cross section is The average modulus of elasticity of the cross section under load at that time. , The height of the cross-section without damage. η is the cross-sectional height; η is the cross-sectional size correction factor, which is determined by the rate of decrease in the average loaded elastic modulus when the entire cross-section yields.
5. The damage identification method for steel frame structures based on damage morphology parameters as described in claim 1, characterized in that, In the step of calculating the damage factor of the steel frame structure based on the third damage morphology parameter, the fourth damage morphology parameter, and the damage factors of each damaged steel component, the damage factor of the steel frame structure is: in, For steel frame structure damage factors, The number of steel beams, The number of steel columns, For the first Damage factors of steel beams For the first Damage factors of steel columns and We use the geometric parameter correction coefficients of the steel frame structure system to construct a damage model for the steel frame structure.
6. The damage identification method for steel frame structures based on damage morphology parameters as described in claim 1, characterized in that, After establishing the mechanical relationship between the bearing capacity and the damage factor of the steel frame structure based on 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 method further includes: The damage morphology parameters of each steel component on the actual damaged steel frame structure are measured using measuring instruments. Based on the damage model of the damaged steel component and the damage identification method of the damaged steel component, the damage factor, remaining bearing capacity and stiffness of the corresponding damaged steel component are calculated. Based on the damage model of the damaged steel frame structure and the damage identification method of the damaged steel frame structure, the damage factor and the remaining load-bearing capacity of the damaged steel frame structure are calculated, and the mechanical performance of the actual damaged steel frame structure is evaluated.
7. A damage identification system for steel frame structures based on damage morphology parameters, characterized in that, include: The first acquisition module is used to conduct material property tests on steel of different materials under different degrees of damage to obtain the relationship between the degree of damage and the rate of decrease in the elastic modulus of the steel. The second acquisition module is used to perform loading tests on steel components to obtain the load magnitude, strain gauge readings, displacement readings and first damage mode parameters of steel components under different damage levels. The third acquisition module is used to establish a finite element analysis model of the steel component using numerical simulation analysis methods, calculate the mechanical properties of the component when the geometric parameters change, and obtain the bearing capacity, cross-sectional strain distribution data, component deflection deformation value and second damage mode parameters of the steel component under different damage degrees. The calculation module is used to calculate the non-destructive height ratio of the cross-section based on the cross-sectional strain distribution data. The fourth acquisition module is used to obtain the average loaded elastic modulus of the damaged section based on the relationship between the undamaged height ratio of the cross section and the degree of damage to the steel and the rate of decrease in elastic modulus. The evaluation module is used to evaluate the damage factor of a section by the rate of decrease in the elastic modulus of the damaged steel component section. The construction module is used to establish the mechanical relationship between the damage morphology parameters, bearing capacity, deflection and damage factor based on the bearing capacity, the component deflection value, the first damage morphology parameter and the second damage morphology parameter, combined with the damage factor, and to construct a damage model of the damaged steel component expressed by the damage morphology parameters. The judgment module is used to calculate the damage model of the damaged steel component, obtain the remaining bearing capacity and bending stiffness of the steel component, propose a damage identification method for the damaged steel component, and determine whether the remaining bearing capacity and stiffness of the steel component after damage can meet the stress requirements. Experimental tests were conducted on the steel frame structure to obtain the load magnitude, strain gauge readings, displacement values, and third damage mode parameters of the steel components and the steel frame structure under different damage levels. Numerical simulation analysis was used to obtain the bearing capacity, cross-sectional strain value, cross-sectional displacement value, and fourth damage mode parameters of steel members and steel frame structure. Based on the cross-sectional strain value, the cross-sectional displacement value, the third damage mode parameter, and the fourth damage mode parameter, combined with the cross-sectional damage factor, the damage factor of each damaged steel component is calculated. The damage factor of the steel frame structure is calculated based on the third damage morphology parameter, the fourth damage morphology parameter, and the damage factor of each damaged steel component. Based on the bearing capacity and the damage factor of the steel frame structure, a mechanical relationship between the bearing capacity and the damage factor of the steel frame structure is established, and a damage identification method for damaged steel frame structures is proposed.
8. The damage identification system for steel frame structures based on damage morphology parameters as described in claim 7, characterized in that, In the calculation module, the ratio of the non-destructive height of the cross section is: in, The height of the cross-section without damage. The height of the cross-section without damage. This represents the cross-sectional height.
9. The damage identification system for steel frame structures based on damage morphology parameters as described in claim 7, characterized in that, In the fourth acquisition module, the average loaded elastic modulus of the damaged section is: in, The average loaded elastic modulus of the damaged section. The elastic modulus of the steel after it is damaged. Let be the cross-sectional area of the component.