Seismic Analysis Of The Support Structure For Offshore Wind Turbine

In recent years, the wind energy continues to grow rapidly throughoutthe world. Wind farm are built on the active earthquake zone in mostregions of the world, but there isn't seismic design code for wind turbinestructures. A simplified procedure is to calculate the seismic loads isprovided in IEC 61400-1, but the simplified method may lead tooconservative or unsafe for seismic design of wind turbine. So, rationalestimation seismic response becomes an important part for seismic designof wind turbine.In this thesis, IEC simplified method,equivalent base shear methodand mode-superposition response spectrum method are used to analysis thesupport structure of wind turbine. The seismic reactions of the structureon different site conditions have been obtained through abovemethods, and the calculation results have been compared. In order to getmore exact results, finite element software has been used to analysis thesame model. The input seismic waves were selected according to the sitecondition and distance .The time histories of the wind turbine underactual seismic waves have been export. The results which are importantfor seismic design of the wind turbine structure have been compared withthose of the standardize methods.It's found that the calculation results of the standardize methodsare large. So the standard method in the seismic design of wind turbine isconservative. The IEC method is relatively simple and suitable forpreliminary calculations. The conclusions in this paper can providebasis for the design and optimization of wind turbine. At the sametime, they can provide reference for the writing of the code of seismicdesign of wind turbine.