Analysis of Monopile Foundation for Offshore Wind Turbine

Abstract

Load deformation characteristics of monopile are being analyzed in the project. As monopile is a supporting structure for offshore wind turbines. Due to varying environmental conditions exact prediction of load value is not possible but it is important to analyze the load vs deformation relationships to see the behavior of monopile. Monopile structure is subjected to wave, wind load and vertical load for the analysis wave are taken to sinusoidal in nature. The p-y method indicates that the design code recommended p-y curves overestimate for the case of large diameter monopiles the initial stiffness and underestimate the ultimate bearing capacity. When applying the recommended p-y curves as linear springs in a 2D Winkler beam model, the global response of monopole can be calculated regarding load and applied displacement. It is about response based analysis, in which the failure load is being derived from the model developed in MATLAB. In FEM using Abaqus and PLAXIS 3D lateral deflection of the monopile is being seen to visualize the effect of the static lateral load as well as dynamic lateral load with and without vertical loadings. To compare the analysis methods reliability is being calculated using response surface and first order method and the probability of failure is being calculated.