Numerical Analysis Of Mechanical Behavior Of Monopile Foundations For Wind Turbines

With the rapid development of economy,the problem of energy shortage is becoming more and more serious.As a way to obtain a new type of green energy,offshore wind turbine power generation is attracting increasing attention from coastal countries.Promoting the development of offshore wind turbines is an effective way to solve the problem of energy shortage.The large diameter monopile foundation has become the most efficient foundation form of offshore wind turbines because of its advantages such as fast construction speed,cost saving and so on.In order to ensure the normal operation of offshore wind turbines,the deformation of large diameter monopole foundation must be strictly controlled.Therefore,it is of great practical significance to establish the numerical model of large diameter monopile foundation of offshore wind turbines to analyze the characteristics of force and deformation,which is very important to further understand the interaction mechanism of pile and soil in offshore wind turbines' large diameter monopile foundation.Based on ADINA,a three-dimensional finite element analysis model for the interaction between large diameter steel pipe pile and soil is established in this paper,which combines static analysis,dynamic modal analysis and dynamic time history progressive time integration method.The static response of large diameter monopile foundation and the dynamic response under wind and wave loads are analyzed from the perspective of complete interaction.(1)Considering the influence of pile-soil interaction,the soil is divided into two layers:soft clay and hard clay.The static responses of pile and soil under axial and horizontal loads are analyzed.On this basis,a simplified static p-y curve is obtained to simulate pile-soil interaction.Based on the parameterized analysis of the deformation of the pile body and the factors affecting the force,some suggestions for the design of the steel pipe pile are given.(2)On the basis of modal analysis of pile-soil interaction system of steel pipe,the dynamic time-history analysis of Kaimal wind loading wave is carried out,and the time-history curves of horizontal displacement,effective stress and acceleration at the top of pile are analyzed.The performance of large diameter monopile foundation under wind load and wave load is comprehensively evaluated.