Dynamic response analysis of offshore single pile wind turbine under near-field ground motion

Here, the seismic analysis and soil-structure interaction (SSI) module was developed based on FAST V7 to form the aerodynamic-hydraulic-seismic-servo-SSI simulation platform FAST-S, the software Seismic and ABAQUS were adopted to verify calculation accuracy and reliability of the seismic analysis module. Through the extended FAST-S platform, a 5 MW offshore single pile wind turbine model considering SSI effect was established to analyze coupled effects among wind, wave and earthquake, and study effects of near-field ground motion velocity pulse on dynamic-response of wind turbine support structure under shutdown and operation conditions. The results showed that earthquake intensifies tower top vibration, and wind wave load has a certain action to reduce tower top vibration induced by earthquake; there exist nonlinear coupled relations among aerodynamic load, hydrodynamic load and seismic load, and wind-wave-seismic coupled effects should be fully considered in calculation; near-field seismic velocity pulse can increase tower top displacement, tower top acceleration and bending moment at mudline of wind turbine under shutdown and operation conditions; during structural design, attention should be paid to adverse effects of pulse type ground motion on wind turbine structure, especially, structural safety of wind turbine under shutdown. © 2022 Chinese Vibration Engineering Society. All rights reserved.