Method and system for evaluating corrosion risk of offshore wind power steel structure

Abstract

The invention provides a corrosion risk assessment method and system for an offshore wind power steel structure, and the method comprises the steps: monitoring the corrosion state of the offshore wind power steel structure, and obtaining corrosion state data; based on the corrosion state data, corrosion rate parameters are calculated according to a corrosion rate model; calculating and analyzing the electric steel structure mechanical model to obtain a structure safety coefficient; checking the remaining service life of the steel structure according to the corrosion rate parameter and the structural safety coefficient to obtain a remaining service life parameter of the steel structure; and a corrosion risk grading standard is formulated, and the corrosion risk grade of the offshore wind power steel structure is obtained through evaluation. By comprehensively considering the corrosion state, the corrosion rate, the structure safety and the remaining service life, the corrosion risk can be recognized as soon as possible, technical support is provided for operation and maintenance work of the offshore wind power steel structure, then it is ensured that the structure can still keep sufficient safety under the influence of corrosion, the operation and maintenance cost and efficiency are optimized, and the service life of the structure is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of monitoring and maintenance of offshore wind turbine structures, and in particular relates to a method and system for assessing the corrosion risk of offshore wind turbine steel structures. Background Art

[0002] As a clean energy source, offshore wind power has developed rapidly in recent years. However, due to the harsh offshore environment, offshore wind power steel structures are exposed to high salt, high humidity, strong wind and other conditions for a long time, and are prone to corrosion. Corrosion not only reduces the bearing capacity of steel structures, but also shortens their service life, seriously threatening the safe operation of offshore wind power facilities. Therefore, establishing an effective corrosion risk classification strategy is of great significance to ensure the safety and reliability of offshore wind power steel structures. In traditional methods, regular visual inspections and simple corrosion measurements are generally adopted, such as coating thickness detection and local corrosion depth measurement. Such methods are highly subjective and limited, and usually only focus on the surface phenomena of corrosion, such as corrosion area, corrosion depth, etc., without in-depth analysis of the impact of corrosion on the mechanical properties of steel structures, making it difficult to accurately assess the overall corrosion status and potential risks of steel structures.

[0003] As an improvement, some advanced detection technologies have emerged, such as ultrasonic testing and magnetic particle testing. Although such technologies can provide more detailed corrosion information, they are difficult to be applied on a large scale to the daily monitoring of offshore wind power steel structures due to their limited applicability. In addition, most of the current corrosion risk assessment models for offshore wind power steel structures do not fully consider the changes in the mechanical properties of the structure and the prediction of the remaining life, resulting in the inability of the assessment results to effectively guide maintenance decisions. It is then difficult to formulate targeted protective measures, resulting in poor protection effects, increased maintenance costs and safety risks. Therefore, in summary, the current assessment methods for the corrosion of offshore wind turbine structures have limited applicability, and cannot predict changes in the mechanical properties of the structure and the remaining life, resulting in poor accuracy of the assessment results, and it is then difficult to formulate targeted protective measures, resulting in poor protection effects, increased maintenance costs and safety risks. Summary of the invention

[0004] The present invention provides a method and system for assessing the corrosion risk of offshore wind power steel structures, aiming to solve the problem that the current corrosion assessment methods for offshore wind turbine structures have limited applicability and cannot effectively predict changes in structural mechanical properties and remaining life, resulting in poor accuracy and effectiveness of assessment results, which may affect subsequent operation and maintenance operations.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A method for assessing the corrosion risk of an offshore wind power steel structure comprises the following steps:

[0007] S1. Monitor the corrosion status of offshore wind power steel structures to obtain corrosion status data of offshore wind power steel structures;

[0008] S2. Based on the corrosion state data, the corrosion rate parameters of the offshore wind power steel structure are calculated according to the corrosion rate model;

[0009] S3. Input the corrosion rate parameters into the offshore wind power steel structure mechanical model, and calculate and analyze the steel structure mechanical model to obtain the structural safety factor;

[0010] S4. Check the remaining service life of the offshore wind power steel structure according to the corrosion rate parameter and the structural safety factor to obtain the remaining service life parameter of the offshore wind power steel structure;

[0011] S5. Based on the corrosion rate parameters, structural safety factor and remaining service life parameters, a corrosion risk classification standard is formulated to evaluate the corrosion risk classification of offshore wind power steel structures.

[0012] In some embodiments, in S1, a sensor group is installed in a monitoring area of ​​an offshore wind power steel structure; wherein the sensor group includes a corrosion sensor and a strain sensor.

[0013] In some embodiments, in S2, the corrosion rate parameter is calculated according to the corrosion rate model of the following formula (1):

[0014] C=k×E a ×T b ×H c ×S d (1);

[0015] Among them, C is the corrosion rate, k is a constant, E is the potential, T is the temperature, H is the humidity, S is the salinity, and a, b, c, and d are exponents.

[0016] In some embodiments, in S3, a mechanical model of an offshore wind power steel structure is established based on a finite element analysis method, and the structural safety factor is calculated based on steel section loss parameters caused by corrosion and mechanical property degradation parameters caused by corrosion.

[0017] Furthermore, in S3, the steel section loss parameter caused by corrosion is calculated according to the following formula (2):

[0018]

[0019] Among them, A corr is the new cross-sectional area, A0 is the initial cross-sectional area, C is the corrosion rate, t is the corrosion time, and d is the steel thickness.

[0020] Furthermore, in S3, the corrosion-induced mechanical property degradation parameter is calculated according to the following formula (3):

[0021] f y,corr =f y,0 (1-αCt) (3);

[0022] Among them, f y,corr Corrosion will reduce the yield strength of steel, f y,0 is the initial yield strength and α is a coefficient related to the steel type and the corrosive environment.

[0023] Furthermore, in S3, the structural safety factor FS is calculated by comparing the structural resistance and the action effect, as shown in the following formula (3):

[0024]

[0025] Among them, FS is the structural safety factor, R is the structural resistance, S is the action effect, and F v is the wind load, F w is the wave load and G is the gravity of the steel structure.

[0026] In some embodiments, in S4, the remaining fatigue life of the steel structure is calculated based on the corrosion rate parameter and the structural safety factor, using fatigue crack growth theory and combining material fatigue performance data under a corrosive environment; the corrosion life of the steel structure is calculated based on the effect of corrosion on the durability of the steel structure.

[0027] In some embodiments, in S4, fatigue crack growth theory is according to the following formula (4):

[0028]

[0029] Where N is fatigue life, A0 is the basic constant when there is no corrosion, k1 is the coefficient related to corrosion, m is the material constant, ΔK is the stress intensity factor amplitude related to the geometry of the steel structure, and R1 is the stress ratio; according to the following formula (5), the corrosion life of the steel structure is

[0030]

[0031] Among them, t is the corrosion life, d is the maximum allowable corrosion loss, and C is the corrosion rate.

[0032] The present invention also provides an assessment system for the corrosion risk of offshore wind power steel structures, the assessment system comprising a corrosion data acquisition module, a structural performance and service life analysis module and a corrosion risk classification module; wherein:

[0033] The corrosion data acquisition module is used to collect corrosion status data and input it into the structural performance and service life analysis module;

[0034] The structural performance and service life analysis module is used to calculate and analyze the corrosion rate parameters, structural safety factors and remaining service life parameters based on the corrosion status data;

[0035] The corrosion risk classification module is used to classify the corrosion risk of offshore wind power steel structures based on corrosion rate parameters, structural safety factors and remaining service life parameters, and output the assessment results.

[0036] Compared with the prior art, the corrosion risk assessment method and system of an offshore wind power steel structure of the present invention has the following beneficial effects:

[0037] The present invention provides a corrosion risk assessment method for an offshore wind power steel structure, comprising the following steps: S1, monitoring the corrosion state of the offshore wind power steel structure to obtain the corrosion state data of the offshore wind power steel structure; S2, based on the corrosion state data, calculating the corrosion rate parameters of the offshore wind power steel structure according to the corrosion rate model; S3, inputting the corrosion rate parameters into the mechanical model of the offshore wind power steel structure, and calculating and analyzing the mechanical model of the electric steel structure to obtain the structural safety factor; S4, checking the remaining service life of the offshore wind power steel structure according to the corrosion rate parameters and the structural safety factor, and obtaining the remaining service life parameters of the offshore wind power steel structure; S5, formulating a corrosion risk classification standard based on the corrosion rate parameters, the structural safety factor and the remaining service life parameters, and evaluating and obtaining the corrosion risk classification of the offshore wind power steel structure. Based on the above, the present invention monitors the corrosion state to obtain data; calculates the corrosion rate based on the data; analyzes the structural safety factor using a mechanical model; checks the remaining service life in combination with the corrosion rate and the structural safety factor; and obtains the corrosion risk classification based on parameter evaluation by formulating a corrosion risk classification standard. By comprehensively considering the corrosion status, corrosion rate, structural safety and remaining service life, this method can identify corrosion risks early, provide a basis for the formulation of preventive maintenance and repair strategies, extend the service life of the structure, ensure that the structure can still maintain sufficient safety under the influence of corrosion, and optimize the cost and efficiency of operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0039] Figure 1 The present invention is a flow chart of a method and system for assessing corrosion risk of offshore wind power steel structures. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0044] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0045] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] How to comprehensively consider structural safety and life verification to provide a grading method for corrosion risks of offshore wind power steel structures, achieve accurate assessment of corrosion risks, and provide technical support for maintenance and repair.

[0047] like Figure 1 As shown, the present invention provides a method for assessing the corrosion risk of an offshore wind power steel structure, comprising the following steps:

[0048] S1. Monitor the corrosion status of offshore wind power steel structures to obtain corrosion status data of offshore wind power steel structures;

[0049] S2. Based on the corrosion state data, the corrosion rate parameters of the offshore wind power steel structure are calculated according to the corrosion rate model;

[0050] S3. Input the corrosion rate parameters into the offshore wind power steel structure mechanical model, and calculate and analyze the steel structure mechanical model to obtain the structural safety factor;

[0051] S4. Check the remaining service life of the offshore wind power steel structure according to the corrosion rate parameter and the structural safety factor to obtain the remaining service life parameter of the offshore wind power steel structure;

[0052] S5. Based on the corrosion rate parameters, structural safety factor and remaining service life parameters, the corrosion risk classification standard is formulated to evaluate the corrosion risk classification of offshore wind power steel structures.

[0053] The present invention conducts a graded assessment of the corrosion risk of offshore wind power steel structures by considering structural safety and life verification. The assessment method can accurately assess the corrosion risk of steel structures and facilitate the protection and maintenance of offshore wind power steel structures. The present invention can comprehensively consider various corrosion influencing factors by establishing an accurate corrosion model, conduct structural safety assessment in combination with finite element analysis, accurately calculate the safety factor, adopt a reasonable life verification method, accurately predict the remaining service life, formulate a scientific and reasonable corrosion risk classification standard, and comprehensively consider structural safety and life factors.

[0054] The present invention provides a method for assessing the corrosion risk of an offshore wind power steel structure, wherein the offshore wind power steel structure is used to support the metal structure of an offshore wind turbine generator set, including some steel structure facilities such as towers and foundations. Corrosion risk grading is to assess and classify the degree of corrosion and possible risks of offshore wind power steel structures based on certain standards and methods. Structural safety refers to the ability of a steel structure to maintain its stability, strength and rigidity without damage or excessive deformation when subjected to various loads and environmental effects. Life verification: Evaluate and verify the remaining service life of the steel structure to determine whether it can meet the design requirements.

[0055] The present invention installs corrosion sensors and strain sensors in the monitoring area to collect the corrosion status and mechanical response data of offshore wind power steel structures in real time. The sensor group directly measures the corrosion and mechanical parameters to improve the accuracy and real-time nature of the data. Simultaneous monitoring of the corrosion and mechanical status helps to more fully understand the changes in structural performance, timely discover abnormal data, and warn of potential corrosion problems.

[0056] The corrosion rate parameters of the present invention are calculated by a corrosion rate model that takes into account multiple environmental factors such as potential, temperature, humidity and salinity. The present invention is based on a multi-factor model and accurately reflects the impact of the environment on the corrosion rate. The present invention can be applied to offshore wind power steel structures under different environmental conditions and provide a basis for predicting future corrosion conditions.

[0057] The present invention establishes a mechanical model of offshore wind power steel structure, and considers the steel section loss and mechanical property degradation caused by corrosion to calculate the structural safety factor. In this way, the specific impact of corrosion on structural performance is considered, the assessment accuracy is improved, and it is ensured that the structure can still meet the safety requirements under the influence of corrosion, providing a scientific basis for maintenance and replacement decisions.

[0058] The present invention combines fatigue crack growth theory and material fatigue performance data in a corrosive environment to calculate the remaining fatigue life and corrosion life, respectively considering the effects of fatigue and corrosion on the structural life, improving the level of detail in the evaluation, providing data support for long-term operation and maintenance plans, and optimizing maintenance and replacement plans based on the remaining life evaluation to reduce costs.

[0059] The present invention provides specific calculation formulas for fatigue crack growth and corrosion life, which are used to quantitatively evaluate the remaining fatigue life and corrosion life. The remaining life is calculated by the specific formula to provide a quantitative evaluation result. The formula is simple and clear, and is convenient for practical engineering application. The parameters in the formula can be adjusted according to actual conditions to adapt to different environmental conditions.

[0060] Based on the above-mentioned corrosion risk assessment method for offshore wind power steel structure, the present invention also provides a corrosion risk assessment system for offshore wind power steel structure, which includes a corrosion data acquisition module, a structural performance and service life analysis module and a corrosion risk grading module; the corrosion data acquisition module is used to collect corrosion state data and input it into the structural performance and service life analysis module; the structural performance and service life analysis module is used to obtain corrosion rate parameters, structural safety factors and remaining service life parameters after calculation and analysis based on the corrosion state data; the corrosion risk grading module is used to grade the corrosion risk of offshore wind power steel structure based on the corrosion rate parameters, structural safety factors and remaining service life parameters, and output the assessment results. The system of the present invention completes the corrosion risk assessment through the collaborative work of various modules, realizes the systematization and process of corrosion risk assessment through modular design, automates the data acquisition and analysis process, reduces manual intervention, improves work efficiency, and has a flexible system architecture that can be expanded and upgraded according to needs. The assessment results are output in a visual form for easy understanding and application.

[0061] The corrosion risk assessment method of the offshore wind power steel structure of the present invention is further described in detail below through specific embodiments.

[0062] Corrosion monitoring and data acquisition;

[0063] Install a variety of sensors, such as corrosion sensors, strain sensors, etc., to monitor the corrosion conditions and mechanical property changes of steel structures in real time.

[0064] In actual operation, the present invention can periodically perform nondestructive testing on offshore wind power steel structures within a preset time to obtain corrosion defect information inside the wind power steel structures. Nondestructive testing includes ultrasonic testing and radiographic testing. In addition, regular manual testing is performed to obtain data such as the surface corrosion status of the steel structure and coating damage to enrich the database of corrosion status data.

[0065] Establish corrosion model;

[0066] Comprehensively analyze the collected data and establish a corrosion rate model:

[0067] C=k×E a ×T b ×H c ×S d (1);

[0068] Among them, C is the corrosion rate, k is a constant, E is the potential, T is the temperature, H is the humidity, S is the salinity, and a, b, c, and d are exponents.

[0069] Structural safety analysis

[0070] Based on the finite element analysis method, a mechanical model of offshore wind power steel structure is established. The corrosion rate and other parameters calculated by the corrosion model are input into the mechanical model to analyze the impact of corrosion on the strength, stability and stiffness of the steel structure. Specifically:

[0071] Consider the loss of steel section due to corrosion;

[0072] Assuming that corrosion causes uniform thinning of the steel, the new cross-sectional area A corr It can be expressed as:

[0073]

[0074] Among them, A corr is the new cross-sectional area, A0 is the initial cross-sectional area, C is the corrosion rate, t is the corrosion time, and d is the steel thickness.

[0075] Consider the degradation of mechanical properties caused by corrosion;

[0076] Corrosion reduces the yield strength of steel y,corr , its degradation law can be determined by empirical formula or experimental data:

[0077] f y,corr =f y,0 (1-αCt) (3);

[0078] Among them, f y,corr Corrosion will reduce the yield strength of steel, f y,0 is the initial yield strength and α is a coefficient related to the steel type and the corrosive environment.

[0079] The structural safety factor FS is calculated by comparing the structural resistance and the action effect, as shown in the following formula (3):

[0080]

[0081] Among them, FS is the structural safety factor, R is the structural resistance, S is the action effect, and F v is the wind load, F w is the wave load, and G is the gravity of the steel structure.

[0082] Life verification;

[0083] According to the corrosion model and structural safety analysis results, fatigue analysis and durability analysis methods are used to check the remaining service life of the steel structure. The calculation of the remaining service life is as follows:

[0084] The fatigue crack growth theory is used in combination with the material fatigue performance data under corrosive environment to predict the remaining fatigue life of steel structures:

[0085] The fatigue crack growth theory is based on the following formula (4):

[0086]

[0087] Among them, N is the fatigue life, A0 is the basic constant when there is no corrosion, k1 is the coefficient related to corrosion, m is the material constant, ΔK is the stress intensity factor amplitude related to the geometry of the steel structure, and R1 is the stress ratio.

[0088] Considering the impact of corrosion on the durability of steel structures, calculate their corrosion life in marine environments:

[0089]

[0090] Among them, t is the corrosion life, d is the maximum allowable corrosion loss, and C is the corrosion rate estimated by the corrosion model.

[0091] Corrosion risk classification;

[0092] Taking into account factors such as structural safety factor, remaining service life and corrosion degree, the corrosion risk of offshore wind power steel structures is graded. The classification standards can be as follows:

[0093] Low risk level I: structural safety factor greater than 2.0; remaining service life greater than 25 years; corrosion life greater than 30 years. Lower risk level II: structural safety factor 1.6-2.0; remaining service life 15-25 years; corrosion life: 20-30 years. Medium risk level III: structural safety factor: 1.2-1.6; remaining service life: 8-15 years; corrosion life: 12-20 years. Higher risk level IV: structural safety factor: 0.8-1.2; remaining service life: 3-8 years; corrosion life: 5-12 years. High risk level V: structural safety factor: less than 0.8; remaining service life: less than 3 years; corrosion life: less than 5 years. Based on the results of risk grading, formulate corresponding protective measures, such as coating repair, cathodic protection, structural reinforcement, etc.

[0094] The present invention can comprehensively consider various corrosion influencing factors by establishing an accurate corrosion model, combine finite element analysis to conduct structural safety assessment, accurately calculate the safety factor, and adopt a reasonable life verification method to accurately predict the remaining service life. Formulate a scientific and reasonable corrosion risk classification standard, comprehensively consider structural safety and life factors, so as to carry out efficient maintenance of offshore wind power steel structures.

[0095] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A method for assessing the corrosion risk of offshore wind power steel structures. It is characterized in that The steps include: S1. Monitor the corrosion status of offshore wind power steel structures to obtain corrosion status data of offshore wind power steel structures; S2. Based on the corrosion state data, the corrosion rate parameters of the offshore wind power steel structure are calculated according to the corrosion rate model; S3. Input the corrosion rate parameter into the offshore wind power steel structure mechanical model, and calculate and analyze the steel structure mechanical model to obtain the structural safety factor; S4. Check the remaining service life of the offshore wind power steel structure according to the corrosion rate parameter and the structural safety factor to obtain the remaining service life parameter of the offshore wind power steel structure; S5. Based on the corrosion rate parameters, structural safety factor and remaining service life parameters, a corrosion risk classification standard is formulated to evaluate the corrosion risk classification of offshore wind power steel structures.

2. The method for assessing the corrosion risk of offshore wind power steel structures according to claim 1, It is characterized in that In S1, a sensor group is installed in a monitoring area of ​​an offshore wind power steel structure; wherein the sensor group includes a corrosion sensor and a strain sensor.

3. The method for assessing corrosion risk of offshore wind power steel structures according to claim 1, It is characterized in that In S2, the corrosion rate parameter is calculated according to the corrosion rate model of the following formula (1): C=k×E a ×T b ×H c ×S d (1); Among them, C is the corrosion rate, k is a constant, E is the potential, T is the temperature, H is the humidity, S is the salinity, and a, b, c, and d are exponents.

4. The method for assessing corrosion risk of offshore wind power steel structures according to claim 1, It is characterized in that In S3, a mechanical model of an offshore wind power steel structure is established based on a finite element analysis method, and the structural safety factor is calculated based on steel section loss parameters caused by corrosion and mechanical property degradation parameters caused by corrosion.

5. The method for assessing the corrosion risk of offshore wind power steel structures according to claim 4, It is characterized in that In S3, the steel section loss parameter caused by corrosion is calculated according to the following formula (2): Among them, A corr is the new cross-sectional area, A 0 is the initial cross-sectional area, C is the corrosion rate, t is the corrosion time, and d is the steel thickness.

6. The method for assessing the corrosion risk of offshore wind power steel structures according to claim 5, It is characterized in that In S3, the mechanical property degradation parameter caused by corrosion is calculated according to the following formula (3): f y，corr =f y，0 (1-αCt) (3); Among them, f y，corr Corrosion will reduce the yield strength of steel, y，0 is the initial yield strength and α is a coefficient related to the steel type and the corrosive environment.

7. The method for assessing corrosion risk of offshore wind power steel structures according to claim 6, It is characterized in that In S3, the structural safety factor FS is calculated by comparing the structural resistance and the action effect, specifically as follows: Among them, FS is the structural safety factor, R is the structural resistance, S is the action effect, and F v is the wind load, F w is the wave load and G is the gravity of the steel structure.

8. The method for assessing corrosion risk of offshore wind power steel structures according to claim 1, It is characterized in that In S4, the remaining fatigue life of the steel structure is calculated based on the corrosion rate parameter and the structural safety factor, using the fatigue crack growth theory and combining the material fatigue performance data under the corrosive environment; the corrosion life of the steel structure is calculated based on the influence of corrosion on the durability of the steel structure.

9. The method for assessing corrosion risk of offshore wind power steel structures according to claim 1, It is characterized in that In S4, the fatigue crack growth theory is according to the following formula (4): Where N is the fatigue life, A 0 is the basic constant when there is no corrosion, k 1 is the coefficient related to corrosion, m is the material constant, ΔK is the stress intensity factor amplitude related to the geometry of the steel structure, and R1 is the stress ratio; According to the following formula (5), the corrosion life of steel structure Among them, t is the corrosion life, d is the maximum allowable corrosion loss, and C is the corrosion rate.

10. An assessment system based on the method for assessing the corrosion risk of an offshore wind power steel structure according to any one of claims 1 to 9, It is characterized in that The evaluation system includes a corrosion data acquisition module, a structural performance and service life analysis module, and a corrosion risk classification module; wherein: The corrosion data acquisition module is used to collect corrosion status data and input it into the structural performance and service life analysis module; The structural performance and service life analysis module is used to obtain corrosion rate parameters, structural safety factors and remaining service life parameters after calculation and analysis based on corrosion state data; The corrosion risk grading module is used to grade the corrosion risk of offshore wind power steel structures based on corrosion rate parameters, structural safety factors and remaining service life parameters, and output evaluation results.

Images