Method and system for evaluating time-varying corrosion bearing capacity of angle steel for smart grid

Abstract

The application provides a kind of angle steel time-varying corrosion bearing capacity evaluation method and system for realizing smart grid, and relates to the technical field of digital operation and maintenance of transmission line.The method obtains the basic parameters and internal force of the tower angle steel component;According to the angle steel corrosion damage criterion, combined with the initial size, atmospheric pollution grade and corrosion life, the damaged section thickness and cross-sectional area of the angle steel component at this time are calculated;Based on the damaged cross-sectional area and the eccentric corrosion influence coefficient when connected with single limb, the axial force bearing capacity of the angle steel component under the time-varying corrosion damage state is calculated and obtained;Finally, the stress ratio is determined according to the internal force and bearing capacity, and the corrosion damage state of the tower is visually evaluated according to the stress ratio.The application breaks through the limitation of traditional static damage iterative calculation, establishes the time-varying corrosion damage relationship between time and angle steel section, thereby realizing efficient and accurate evaluation of bearing capacity, and significantly improving the safety factor and reliability of power grid operation.

Description

Technical Field

[0001] This invention relates to the field of digital operation and maintenance technology for power transmission lines, and more specifically, to a method and system for assessing the time-varying corrosion bearing capacity of angle steel in the context of smart grids. Background Technology

[0002] In the vast and complex power grid infrastructure, the safety and operational reliability of transmission line tower structures directly affect the stable power supply of the entire power grid system. Currently, most transmission towers are assembled from angle steel components. However, these in-service transmission towers are exposed to the complex and ever-changing natural environment, inevitably suffering from continuous corrosion from sun and rain, fluctuating temperature and humidity, and varying degrees of air pollution. This long-term exposure causes the original anti-corrosion galvanized layer on the surface of the angle steel components to gradually wear away and fail, leading to continuous corrosion of the internal steel body. Corrosion not only directly weakens the effective cross-sectional thickness and area of ​​the angle steel components, causing adverse mechanical effects such as eccentric stress, but also leads to a significant decrease in the overall compressive, tensile, and bending load-bearing capacity of the components, making them highly susceptible to tower deformation or even collapse under extreme weather or high-load conditions, resulting in serious power grid accidents.

[0003] To accelerate the digital transformation of transmission lines, accurate and efficient corrosion bearing capacity assessment of angle steel components in in-service transmission towers has become a rigid requirement for power grid operation and maintenance. However, the current industry standard for assessing the corrosion bearing capacity of angle steel components traditionally relies on cumbersome static damage iteration calculations. This traditional method has revealed significant limitations in both theoretical models and practical applications. First, this method is not only inefficient, but the definition of static limit corrosion damage is also extremely complex. Because it fails to establish an explicit dynamic evolution relationship between damage and time, assessors often need to undergo lengthy analysis cycles and massive numerical calculations to barely approximate a relatively accurate assessment result. This static extrapolation, heavily reliant on human experience and time-consuming, is ill-suited to the efficiency requirements of modern smart grids for real-time, dynamic calculations of massive numbers of tower nodes.

[0004] Even more challenging is the fact that such static iterative calculation methods face numerous difficulties in practical engineering deployments. Because their models struggle to adapt to the dynamic changes of various environmental factors, system integration is poor, and the engineering guidance value of the evaluation results is significantly diminished. These insurmountable technical bottlenecks severely restrict the digitalization process of corrosion damage assessment for transmission line towers and also seriously hinder the effective prediction of the load-bearing life of angle steel. The inability to accurately predict the time-varying decay of the load-bearing capacity of angle steel components with increasing service life means that maintenance departments cannot formulate scientifically sound preventative maintenance and precise reinforcement strategies. This not only increases the blind maintenance costs of the power grid but also creates potential structural safety hazards. Therefore, how to abandon outdated static calculation thinking, introduce time dimensions and environmental parameters, and establish a time-varying load-bearing capacity assessment mechanism that can intuitively and efficiently reflect the evolution of corrosion damage has become a crucial issue that engineers in this field urgently need to address. Summary of the Invention

[0005] The present invention aims to solve at least one of the aforementioned technical problems existing in the prior art.

[0006] Therefore, the first aspect of the present invention provides a method for evaluating the time-varying corrosion bearing capacity of angle steel for realizing smart grids.

[0007] The second aspect of this invention provides a system for assessing the time-varying corrosion bearing capacity of angle steel in the context of smart grids.

[0008] This invention provides a method for assessing the time-varying corrosion bearing capacity of angle steel for smart grids, comprising:

[0009] Obtain the basic parameters of the angle steel components of the iron tower, and obtain the internal forces of the angle steel components;

[0010] Based on the corrosion damage criteria for angle steel, and combined with the initial dimensional parameters, corrosion environment parameters, and given corrosion years of the angle steel component, the thickness and cross-sectional area of ​​the angle steel component after damage under the given corrosion years are calculated.

[0011] According to the calculation criteria for the time-varying corrosion bearing capacity of angle steel, based on the cross-sectional area after damage and combined with the eccentric corrosion influence coefficient determined according to the cross-sectional thickness after damage, the axial bearing capacity of the angle steel component under the time-varying corrosion damage state is calculated.

[0012] The stress ratio is determined based on the internal force of the angle steel member and the axial bearing capacity under the time-varying corrosion damage state, and the corrosion damage state of the tower is evaluated based on the stress ratio.

[0013] The method for assessing the time-varying corrosion bearing capacity of angle steel in smart grids according to the above-described technical solution of the present invention may also have the following additional technical features:

[0014] In the above technical solution, the basic parameters include the specifications of each member of the tower, node bolts, load information, return period and partial factor;

[0015] The process of obtaining the internal force of the angle steel member includes: reading the basic parameters, calculating the internal force of the angle steel member based on the stiffness matrix of the member and the finite element theory.

[0016] In the above technical solution, the method for calculating the cross-sectional thickness of the angle steel component after damage under the corrosion period includes:

[0017]

[0018] in, Indicates the thickness of the steel body layer of the component; Indicates the thickness of the zinc plating layer on the surface of the component; Indicates the number of years of corrosion; Indicates the cross-sectional thickness of the component after damage; This indicates the corrosion rate of the steel substrate under the current corrosive environment; This indicates the corrosion rate of the zinc layer under the current corrosive environment.

[0019] In the above technical solution, the corrosion rates of the steel body layer and the zinc layer are determined based on the atmospheric pollution level of the environment in which the angle steel component is located, and are expressed as follows:

[0020]

[0021]

[0022] Where e represents the natural constant; C represents the corrosion constant, the value of which is related to the air pollution level of the environment in which the angle steel component is located. The higher the air pollution level, the greater the value of the corrosion constant.

[0023] In the above technical solution, the method for calculating the cross-sectional area of ​​the angle steel member after damage includes:

[0024]

[0025] in, This indicates the cross-sectional area of ​​the angle steel component after damage; This indicates the width of the angle steel component's cross-section.

[0026] In the above technical solution, the calculation method for the eccentric corrosion influence coefficient includes:

[0027]

[0028] in, Indicates the thickness of the steel body layer of the component; Indicates the cross-sectional thickness of the component after damage; This represents the eccentric corrosion influence coefficient of angle steel components.

[0029] In the above technical solution, the method for calculating the axial bearing capacity of the angle steel member under time-varying corrosion damage includes:

[0030]

[0031] in, This indicates the axial bearing capacity of an angle steel member under time-varying corrosion damage. This indicates the cross-sectional area of ​​the angle steel component after damage; Indicates the yield strength of steel; This represents the resistance partial factor.

[0032] In the above technical solution, the method for calculating the stress ratio includes:

[0033]

[0034] in, The stress ratio is represented by N; the internal force of the angle steel member is represented by N. This indicates the axial bearing capacity of an angle steel member under time-varying corrosion damage.

[0035] In the above technical solution, the assessment of the corrosion damage state of the tower based on the stress ratio includes:

[0036] If the stress ratio A value between 0 and 0.6 indicates that the load-bearing capacity of the tower after corrosion damage is sufficient, and normal operation and maintenance can be carried out accordingly.

[0037] If the stress ratio A value between 0.6 and 0.95 indicates that the tower's load-bearing capacity is sufficient after corrosion damage, and normal operation and maintenance should be carried out accordingly.

[0038] If the stress ratio A value between 0.95 and 0.99 indicates that the load-bearing capacity of the tower after corrosion damage is close to the design limit, and the frequency of operation and maintenance needs to be increased on the basis of normal protection.

[0039] If the stress ratio A value greater than or equal to 1.0 indicates that the load-bearing capacity of the tower after corrosion damage does not meet the design requirements and requires key repair and reinforcement.

[0040] This invention provides a system for assessing the time-varying corrosion bearing capacity of angle steel for smart grids, comprising:

[0041] The database module is used to import and store the basic parameters of the angle steel components of the iron tower;

[0042] The internal force finite element calculation component is used to read the basic parameters and calculate the internal forces of the angle steel member;

[0043] An angle steel time-varying corrosion bearing capacity assessment center is used to perform the assessment method as described in any one of the above technical solutions to obtain stress ratio assessment results;

[0044] The output terminal is used to display the evaluation results through a GUI window and generate an evaluation report on the time-varying corrosion bearing capacity of angle steel.

[0045] In summary, due to the adoption of the above-mentioned technical features, the beneficial effects of the present invention are:

[0046] Compared with existing technologies, this invention provides a method and system for assessing the time-varying corrosion bearing capacity of angle steel for smart grids, overcoming the limitations of traditional methods that rely on cumbersome static damage iteration calculations. By introducing advanced digital technology, this invention creatively establishes the relationship between time and the time-varying corrosion damage of the angle steel cross-section, thereby constructing an explicit criterion for assessing the time-varying corrosion bearing capacity of angle steel. This method effectively overcomes the shortcomings of traditional static limit corrosion damage definition, which is complex, computationally intensive, and inefficient, providing strong technical support for the digital design and operation and maintenance of transmission line towers.

[0047] This invention comprehensively considers the dual degradation patterns of the galvanized layer on the surface of angle steel and the internal steel body layer under different atmospheric pollution environments, accurately quantifying the weakening effect of corrosion years and environmental corrosion rate on the thickness and area of ​​the component cross-section. Simultaneously, by introducing an eccentric corrosion influence coefficient for single-limb connections, the axial load-bearing capacity of the foundation is scientifically corrected, ensuring that the load-bearing capacity assessment model highly matches the stress and degradation state of angle steel components in real field service environments. This precise time-varying physical-mathematical model effectively solves the problem of lifespan prediction.

[0048] This invention's system can intuitively present the health status of components on a terminal interface, differentiated according to the stress ratio within different ranges. This intuitive data stream output and visualization operation guides maintenance personnel to quickly determine whether the tower's load-bearing capacity is sufficient and to take targeted differentiated strategies, such as normal maintenance and protection, increased maintenance frequency, or focused repair and reinforcement. The solution of this invention highly aligns with actual engineering deployment needs, effectively solving the problems encountered by traditional assessment methods in practical applications. The implementation of this solution will significantly improve the safety factor and overall reliability of power grid operation.

[0049] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0050] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0051] Figure 1 This is a flowchart of a method for evaluating the time-varying corrosion bearing capacity of angle steel in a smart grid according to an embodiment of the present invention;

[0052] Figure 2 This is a schematic diagram of the operation of an angle steel time-varying corrosion bearing capacity assessment system for realizing a smart grid, according to an embodiment of the present invention. Detailed Implementation

[0053] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0054] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0055] The following reference Figure 1 and Figure 2 This invention describes a method and system for assessing the time-varying corrosion bearing capacity of angle steel for realizing smart grids, provided by some embodiments of the present invention.

[0056] Some embodiments of this application provide a method for assessing the time-varying corrosion bearing capacity of angle steel for realizing smart grids.

[0057] like Figure 1 As shown, the first embodiment of the present invention proposes a method for evaluating the time-varying corrosion bearing capacity of angle steel for realizing smart grids, including the following steps S1 to S5.

[0058] S1. Obtain the basic parameters of the angle steel components of the iron tower, and obtain the internal forces of the angle steel components.

[0059] Specifically, the basic parameters include the specifications of each member of the tower, node bolts, load information, return period, and partial factors.

[0060] In some embodiments, obtaining the internal force of the angle steel member includes: reading the basic parameters, calculating the internal force of the angle steel member based on the stiffness matrix of the member and the finite element theory.

[0061] It should be noted that the above-mentioned method for calculating the internal forces of angle steel components is known to those skilled in the art. The focus of this disclosure is not the method for calculating the internal forces of angle steel components. In addition to the above method, those skilled in the art can also use other methods to calculate and obtain the internal forces of angle steel components.

[0062] S2. Based on the corrosion damage criteria for angle steel, and combined with the initial dimensional parameters, corrosion environment parameters, and given corrosion years of the angle steel component, calculate the post-damage cross-sectional thickness and post-damage cross-sectional area of ​​the angle steel component under the given corrosion years.

[0063] The core principle of this invention lies in overcoming the blind spots of static limit damage assessment and establishing an explicit time-varying corrosion physical and mathematical model. In natural environments, the galvanized layer on the surface of angle steel is consumed first, followed by substantial corrosion of the steel body. Therefore, according to the angle steel corrosion damage criterion, the calculation of the cross-sectional thickness after damage comprehensively considers the degradation rate of these two layers under different atmospheric environments. In some embodiments, the method for calculating the cross-sectional thickness of the angle steel component after damage under the corrosion years includes:

[0064]

[0065] in, Indicates the thickness of the steel body layer of the component; Indicates the thickness of the zinc plating layer on the surface of the component; Indicates the number of years of corrosion; Indicates the cross-sectional thickness of the component after damage; This indicates the corrosion rate of the steel substrate under the current corrosive environment; This indicates the corrosion rate of the zinc layer under the current corrosive environment.

[0066] More specifically, the corrosion rates of the steel body and zinc layer are determined based on the atmospheric pollution level of the environment in which the angle steel component is located, and are expressed as follows:

[0067]

[0068]

[0069] Where e represents the natural constant; C represents the corrosion constant, the value of which is related to the atmospheric pollution level of the environment in which the angle steel component is located. The higher the atmospheric pollution level, the larger the value of the corrosion constant. It is understandable that the corrosion rates of the steel body layer and the zinc layer under different corrosion environments are empirical formulas derived from long-term environmental monitoring data. This embodiment focuses on incorporating the actual impact of atmospheric pollution levels on corrosion rates, avoiding unscientific quantitative analysis.

[0070] In one specific embodiment, the atmospheric pollution level is divided into six levels according to existing standard documents: C1, C2, C3, C4, C5, and CX, with corresponding corrosion constants of 1, 2, 3, 4, 5, and 6 respectively. That is to say, for this embodiment, by obtaining the atmospheric pollution level of the environment in which the angle steel component is located, the actual corrosion rate of the angle steel component can be determined more accurately.

[0071] After determining the thickness of the damaged section, the cross-sectional area of ​​the component after damage can be further calculated. Specifically, the calculation methods for the cross-sectional area of ​​angle steel components after damage include:

[0072]

[0073] in, This indicates the cross-sectional area of ​​the angle steel component after damage; This indicates the width of the angle steel component's cross-section.

[0074] S3. Based on the calculation criteria for the time-varying corrosion bearing capacity of angle steel, and using the cross-sectional area after damage, and combined with the eccentric corrosion influence coefficient determined according to the cross-sectional thickness after damage, calculate the axial bearing capacity of the angle steel component under the time-varying corrosion damage state.

[0075] Considering that angle steel in transmission towers often uses single-limb connections, corrosion not only reduces the cross-sectional area but also causes a shift in the centroid of the section, resulting in an additional eccentric bending moment. To accurately reflect this mechanical effect, this invention introduces an eccentric corrosion influence coefficient for single-limb connections. The calculation method for the eccentric corrosion influence coefficient includes:

[0076]

[0077] in, Indicates the thickness of the steel body layer of the component; Indicates the cross-sectional thickness of the component after damage; This represents the eccentric corrosion influence coefficient of angle steel components.

[0078] Based on the aforementioned cross-sectional area after damage and the eccentric corrosion influence coefficient, and combined with the steel's yield strength and the resistance partial factor required by the structural design code, the bearing capacity of the angle steel member after time-varying corrosion damage can be derived. In a specific embodiment, the calculation method for the axial bearing capacity of the angle steel member under time-varying corrosion damage includes:

[0079]

[0080] The above expression, when expanded, can be expressed as:

[0081]

[0082] in, This indicates the axial bearing capacity of an angle steel member under time-varying corrosion damage. This indicates the cross-sectional area of ​​the angle steel component after damage; Indicates the yield strength of steel; This represents the resistance partial factor.

[0083] S4. Determine the stress ratio based on the internal force of the angle steel member and the axial bearing capacity under the time-varying corrosion damage state, and evaluate the corrosion damage state of the tower based on the stress ratio.

[0084] Specifically, the final result of the bearing capacity assessment is quantitatively expressed as a stress ratio, and the calculation method for the stress ratio includes:

[0085]

[0086] in, The stress ratio is represented by N; the internal force of the angle steel member is represented by N. This indicates the axial bearing capacity of an angle steel member under time-varying corrosion damage.

[0087] In some embodiments, the assessment of the corrosion damage state of the tower based on the stress ratio includes:

[0088] If the stress ratio A value between 0 and 0.6 indicates that the load-bearing capacity of the tower after corrosion damage is sufficient, and normal operation and maintenance can be carried out accordingly.

[0089] If the stress ratio A value between 0.6 and 0.95 indicates that the tower's load-bearing capacity is sufficient after corrosion damage, and normal operation and maintenance should be carried out accordingly.

[0090] If the stress ratio A value between 0.95 and 0.99 indicates that the load-bearing capacity of the tower after corrosion damage is close to the design limit, and the frequency of operation and maintenance needs to be increased on the basis of normal protection.

[0091] If the stress ratio A value greater than or equal to 1.0 indicates that the load-bearing capacity of the tower after corrosion damage does not meet the design requirements and requires key repair and reinforcement.

[0092] Other embodiments of the present invention provide a time-varying corrosion bearing capacity assessment system for angle steel to realize smart grids, including: a database module, an internal force finite element calculation component, a time-varying corrosion bearing capacity assessment center for angle steel, and an output terminal.

[0093] The database module is used to import and store the basic parameters of the angle steel components of the tower; the internal force finite element calculation component is used to read the basic parameters and calculate the internal forces of the angle steel components; the angle steel time-varying corrosion bearing capacity assessment center is used to execute the assessment method as described in any of the above embodiments to obtain the stress ratio assessment results; the output terminal is used to output and display the assessment results through the GUI window and generate the angle steel time-varying corrosion bearing capacity assessment report.

[0094] like Figure 2 As shown, in actual engineering deployment, it is first necessary to determine the basic parameters of each member of the tower, such as specifications, node bolts, load information, return period, and partial factors. This initial data information is then imported into the angle steel specification library, bolt specification library, and load information library in standard table formats such as .xls or .xlsx. This data preparation stage lays the foundation for subsequent mechanical calculations. Subsequently, the internal force finite element calculation component reads the data streams from the three databases mentioned above, and based on its built-in member stiffness matrix and combined with classical finite element mechanics theory, calculates the internal forces of the angle steel members under specific preset working conditions.

[0095] After obtaining the internal forces, the angle steel time-varying corrosion bearing capacity assessment center intervenes, reads the internal force data stream of each angle steel component, and calls the criteria in the time-varying corrosion bearing capacity calculation criterion library to assess the bearing capacity of the component after time-varying corrosion damage.

[0096] In some embodiments, to provide intuitive engineering guidance for the assessment results, the load-bearing capacity assessment results are output to a visualization window as a data stream for the owner to visualize and browse information. The system has a preset four-level intelligent early warning mechanism: if the stress ratio is between 0 and 0.6, the corresponding angle steel component in the visualization window is displayed in blue, indicating that the load-bearing capacity of the tower after corrosion damage is sufficient and maintenance and protection can be carried out according to normal requirements; if the stress ratio is between 0.6 and 0.95, the component is displayed in yellow, indicating that the load-bearing capacity is sufficient and maintenance and protection should also be carried out according to normal requirements; if the stress ratio is between 0.95 and 0.99, the component is displayed in light red, indicating that the load-bearing capacity is close to the design limit and maintenance and inspection frequency should be increased on the basis of normal protection; if the stress ratio is greater than or equal to 1.0, the component will be displayed in red and bold, indicating that the load-bearing capacity no longer meets the design safety requirements and key repair and reinforcement treatment must be carried out immediately.

[0097] After completing the full-process assessment and visualization, the GUI window will output the data stream to the output terminal. The data output terminal will then automatically generate and export an angle steel time-varying corrosion bearing capacity assessment report in .pdf or .doc file format, thus forming a complete and standardized technical document that is easy for front-line engineers to use directly.

[0098] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0099] Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention shall be included within the scope of protection of this invention.

Claims

1. A method for assessing the time-varying corrosion bearing capacity of angle steel for smart grid implementation, characterized in that, include: Obtain the basic parameters of the angle steel components of the iron tower, and obtain the internal forces of the angle steel components; Based on the corrosion damage criteria for angle steel, and combined with the initial dimensional parameters, corrosion environment parameters, and given corrosion years of the angle steel component, the thickness and cross-sectional area of ​​the angle steel component after damage under the given corrosion years are calculated. According to the calculation criteria for the time-varying corrosion bearing capacity of angle steel, based on the cross-sectional area after damage and combined with the eccentric corrosion influence coefficient determined according to the cross-sectional thickness after damage, the axial bearing capacity of the angle steel component under the time-varying corrosion damage state is calculated. The stress ratio is determined based on the internal force of the angle steel member and the axial bearing capacity under the time-varying corrosion damage state, and the corrosion damage state of the tower is evaluated based on the stress ratio. The method for calculating the cross-sectional thickness of the angle steel member after damage under the corrosion period includes: in, Indicates the thickness of the steel body layer of the component; Indicates the thickness of the zinc plating layer on the surface of the component; Indicates the number of years of corrosion; Indicates the cross-sectional thickness of the component after damage; This indicates the corrosion rate of the steel substrate under the current corrosive environment; This indicates the corrosion rate of the zinc layer under the current corrosive environment.

2. The method for assessing the time-varying corrosion bearing capacity of angle steel for realizing smart grids according to claim 1, characterized in that, The basic parameters include the specifications of each member of the tower, node bolts, load information, return period, and partial factor. The process of obtaining the internal force of the angle steel member includes: reading the basic parameters, calculating the internal force of the angle steel member based on the stiffness matrix of the member and the finite element theory.

3. The method for assessing the time-varying corrosion bearing capacity of angle steel for realizing smart grids according to claim 1, characterized in that, The corrosion rates of the steel substrate and zinc coating are determined based on the atmospheric pollution level of the environment in which the angle steel component is located, and are expressed as follows: Where e represents the natural constant; C represents the corrosion constant, the value of which is related to the air pollution level of the environment in which the angle steel component is located. The higher the air pollution level, the greater the value of the corrosion constant.

4. The method for assessing the time-varying corrosion bearing capacity of angle steel for realizing smart grids according to claim 1, characterized in that, The methods for calculating the cross-sectional area of ​​angle steel members after damage include: in, This indicates the cross-sectional area of ​​the angle steel component after damage; This indicates the width of the cross-section of the angle steel component.

5. The method for assessing the time-varying corrosion bearing capacity of angle steel for realizing smart grids according to claim 1, characterized in that, The calculation method for the eccentric corrosion influence coefficient includes: in, Indicates the thickness of the steel body layer of the component; Indicates the cross-sectional thickness of the component after damage; This represents the eccentric corrosion influence coefficient of angle steel components.

6. The method for assessing the time-varying corrosion bearing capacity of angle steel for realizing smart grids according to claim 5, characterized in that, The calculation method for the axial bearing capacity of the angle steel member under time-varying corrosion damage includes: in, This indicates the axial bearing capacity of an angle steel member under time-varying corrosion damage. This indicates the cross-sectional area of ​​the angle steel component after damage; Indicates the yield strength of steel; This represents the resistance partial factor.

7. The method for assessing the time-varying corrosion bearing capacity of angle steel for realizing smart grids according to claim 1, characterized in that, The method for calculating the stress ratio includes: in, The stress ratio is represented by N; the internal force of the angle steel member is represented by N. This indicates the axial bearing capacity of an angle steel member under time-varying corrosion damage.

8. The method for assessing the time-varying corrosion bearing capacity of angle steel for realizing smart grids according to claim 1, characterized in that, The assessment of the corrosion damage state of the tower based on the stress ratio includes: If the stress ratio A value between 0 and 0.6 indicates that the load-bearing capacity of the tower after corrosion damage is sufficient, and normal operation and maintenance can be carried out accordingly. If the stress ratio A value between 0.6 and 0.95 indicates that the tower's load-bearing capacity is sufficient after corrosion damage, and normal operation and maintenance should be carried out accordingly. If the stress ratio A value between 0.95 and 0.99 indicates that the load-bearing capacity of the tower after corrosion damage is close to the design limit, and the frequency of operation and maintenance needs to be increased on the basis of normal protection. If the stress ratio A value greater than or equal to 1.0 indicates that the load-bearing capacity of the tower after corrosion damage does not meet the design requirements and requires key repair and reinforcement.

9. A system for assessing the time-varying corrosion bearing capacity of angle steel for smart grid implementation, characterized in that, include: The database module is used to import and store the basic parameters of the angle steel components of the iron tower; The internal force finite element calculation component is used to read the basic parameters and calculate the internal forces of the angle steel member; An angle steel time-varying corrosion bearing capacity assessment center, used to perform the assessment method as described in any one of claims 1 to 8 to obtain stress ratio assessment results; The output terminal is used to display the evaluation results through a GUI window and generate an evaluation report on the time-varying corrosion bearing capacity of angle steel.

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