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Finite Element Analysis of Laterally Loaded Fin Monopiles for Offshore Wind Turbine Foundation in Plaxis 3D

瑞兹(Syed Muhammad Faheem Rizvi)  
【摘要】:The effort has been made in recent years to increase the generation of sustainable power energy,such as wind energy.The wind turbine industry expands quickly and wind turbines keep on growing in both size and numbers.Morover,new construction sites are incorporated as large areas are required in order to construct the wind turbine farms.This means that onshore area will not fulfill the requirement and offshore wind farms are being built increasingly farther from the coast and in deeper waters.The offshore wind turbines are often placed at water depths of 15m-30m.The most effectively and efficient offshore foundation for wind turbines are monopiles.These monopiles foundation often have an embedded length of 20-35 m and a diameter of 4m-8 m.After a brief outline of the current state-of-the-art of the wind energy industry and an explanation about the significance of monopiles on offshore wind industry,the specificities of their geotechnical design,specifically the lateral-load design of these piles,is addressed.The interaction between the soil and pile is usually characterized by a load-displacement curve,to which several theories were established over the years and is the basis of current lateral-load design of offshore monopiles.The aim of this thesis is to evaluate and compared experimental results of laterally loaded large scale monopiles located in East China Sea with same parameter of finite element model(FEM)of Plaxis3D,which is characterized by its flexible behavior,used as foundations for offshore wind turbines in different layers of soil.In this thesis,a 3D analysis of nonlinear with an elastic plastic soil model,an elastic pile material and interface elements are used to model the pile and soil displacement.The study involves an investigation of the laterally loaded hollow steel monopile piles with 2.8 m outer diameter,with its displacements,followed by an interpretation and validation of the results with the existing theoretical principles of soil mechanics on this area of expertise.Furthermore,a three-dimensional investigation of fin monopile with different parameter,laterally loaded(at 45° and 90° fins)is presented.The behavior of fin piles is difficult to explain by using simple pile-soil theories or two dimensional numerical analyses because of the complicated geometry of the piles.The recent study and experimental data confirmed that the predicted behavior of a monopile was acceptable leading to a more detailed study of the impact of fins and its length upon the lateral resistance.The load-displacement relation of the fin piles are presented in this paper.By placing of fins in monopile,resultant the increase in lateral resistance of pile which is illustrated by plotting the lateral load against displacement of the pile head for various geometries of the pile.It shows,the efficiency of the fins in monopile which also compared with the monopile without fins.The efficiency of the piles increases as the changing in length and direction of the fins.


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