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Seismic fragility curves for an offshore wind-turbine structure were obtained. The dynamic response of an offshore wind turbine was analyzed by considering the nonlinear behavior of layered soil and the added mass effect due to seawater. A pile-soil interaction effect was considered by using nonl- inear p-y, t-z curves. In the analysis, the amplification effect of ground acceleration through layered soil was considered by applying ground motion to each of the soil layers. The vertical variation in ground motion was found by one-dimensional free-field analysis of ground soils. Fragility curves were deter- mined by damage levels in terms of tower stress and nacelle displacements that were found from static pushover analysis of the wind-turbine structure.

Seismic Fragility for 5MW Offshore Wind Turbine using Pushover Analysis