Modified Designiof Monopilesifor the offshore winditurbines (OWT) in the coastal areas of Pakistan

Abstract

The famous American Petroleum Institute (API) method is used commonly for the design of small diameter piles. This method does not incorporate the effect of large diameter and overturning moments of monopiles. The present study deals with design of the Monopileifoundation for offshoreiwind turbine farms in the coastal areas ofiPakistan. ABAQUS FEA software is used to simulate specimens that are subjected to surface lateral loads. While taking into account different structural and environmental factors, including aerodynamic and hydrodynamic forces, a nonlinear static analysis of the substructureiis performed. Various configurations of hollow monopile are studied through parametric analysis, by changing wateridepths and soil properties. Design involves a 3D model of monopile of diameter 3m ,5m ,7m, while treating the soil of the seabed as a non-linear three-dimensional material.Soil is modeled by Mohr Coulomb criteria. As a result, p-y curves are generated. This study particularly recommends a specific diameter for the monopiles for the installation of OWTs in the coastal areas of Karachi and Gwadaribased on its impact on lateral response and structural stability. The proposed model was also validated with an experimental and numerical result of China based Offshore wind turbines that confirmedithe accuracy of the numerical model’s predictions.