Seismic Analysis of Wind Turbine System Including Soil-Structure Interaction

Abstract eng:
A numerical method is presented for the computation of artificial earthquake records consistent with any arbitrarily specified target response spectra (TRS) requirements. The proposed algorithm does not create new time histories but rather modifies, on the basis of an iterative deterministic approach, existing records to fit specific design requirements. The efficiency of the algorithm and the accuracy of the fitting process are substantially improved on the basis of a predictor–corrector type approach. Then, the behavior and the load capacity of the 1 MW horizontal wind turbine steel tower have been studied with the aid of a refined finite element model. The structure is analyzed for seismic loads representing the effects of gravity and possible site-dependent seismic motions. To evaluate the effect of the soil-structure interaction (SSI) on the dynamic performance of wind turbine system, a comparative finite element model taking the foundation and surrounding soil into consideration is also created. Comparative studies have been performed on the results of the above analyses and some useful conclusions are drawn pertaining to the effectiveness and accuracy of the various models used in this work.

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