Numerical Simulation Of Carbon Fiber Repair And Reinforcement In Underwater Damaged Steel Components

With the continuous advancement of the national “Ocean Power” strategy,the development of offshore energy resources has been carried out closely,and the technology of offshore platforms has developed rapidly,it has experienced a great development from a fixed jacket platform in shallow water to a new type of floating production and storage platform(FPSO).The number of offshore platforms is increasing.In the complex marine environment where production activities take place,the structure of the offshore platform has experienced enormous challenges.As the service life of the platform increases,under the influence of environmental corrosion,fatigue load and other factors,the structure has different degrees of damage,which leads to the decrease of its resistance and affects the structural safety.In order to prolong the life of the platform and make it more economical and socially beneficial,it is necessary to repair the damaged offshore platform in time.The traditional repair technology has a series of problems such as difficulty of repairing and the high cost.In view of the urgency of repairing damaged offshore platforms and the deficiencies of traditional technologies,this paper bases on the carbon fiber reinforced polymers(CFRP)used in concrete engineering to repair the performance of concrete structures,and proposes to repair underwater steel structures by using carbon fiber.Therefore,the ANSYS finite element software is used to analyze the reinforcement effect and main influencing factors and provide the foundation for its engineering applications.The main work of this paper is as follows:Firstly,the bonding mechanism,failure mechanism and factors affecting the bond strength of the bonded carbon fiber repaired steel structure are introduced.Based on these,the design principles of the bonded members and the test construction technology and steps of strengthening and repairing steel of carbon fiber are summarized,which can provide a reference for engineering practice and lay a foundation for the next step of finite element simulation.Next,the finite element analysis software ANSYS is used to carry on the numerical analysis to the steel member model strengthened underwater with carbon fiber and three kinds of finite element models are established: solid-solid-shell,solid-combin-shell and solid-link-shell respectively.By comparing the experimental results with the finite elementmodel,a reasonable unit for simulating underwater adhesives is obtained,which provides a reference for the systematic study of carbon fiber underwater reinforcement steel structure.Finally,in order to study the influence of different material parameters on the reinforcement effect,different sets of material parameters were set up for numerical simulation research,and the influence of the shear modulus,thickness and carbon fiber elastic modulus and thickness on the reinforcement effect was obtained.The relevant theory of the knot analyzes the influence mechanism of the results,which provides a basis for further research on the underwater carbon fiber reinforcement and repair of steel components.