Evaluation of Seaquake Response and Structural Failure of Pontoon-Type Floating Offshore Wind Turbines

Abstract

An evaluation method of seaquake response of pontoon-type offshore wind turbines using stationary random vibration theory is presented. Seabed motion in the vertical direction due to an earthquake is modeled as a stationary random process. A BE-FE hybrid model is used for the response analysis. The excitation surface on the seabed is discretized by boundary elements. The response results are used to structural failure probability and the probability is analyzed using a first-order reliability method. Numerical examples show the variety of the responses and the failure probability of structures for class of soil, seismic acceleration and epicentral distance.