单桩式海上风力机整体化地震反应

为了探讨风-波浪-地震共同作用下单桩式海上风机（OWTs）的动力行为，以National Renewable Energy Laboratory（NREL）5 MW风力发电机为研究对象，将风、地震作为独立事件，根据风-波浪统计关系确定波浪谱参数. 改进FAST软件以模拟土-结相互作用，考虑停机、运行和应急停机3种工况，采用气动-伺服-水动-弹性耦合方法分析海上风机地震响应. 算例表明，工作状态显著影响海上风机支撑结构的运动和内力，规律与地震强弱有关；地震动显著影响叶片挥舞振动速度；在风-波浪-地震的共同作用下，海上风机支撑结构危险截面剪力和弯矩峰值超过极端风-波浪作用效应.

Integrated seismic response of monopile supported offshore wind turbines

The 5 MW wind turbine created by National Renewable Energy Laboratory (NREL) was taken as the prototype in order to analyze the dynamic behavior of monopile supported offshore wind turbines (OWTs) excited by the combination of wind, wave and earthquake. Then parameters of the wave spectrum were determined by the statistical relationship between wind and wave assuming that wind and earthquake were independent events. The FAST code was modified to simulate the soil-structure interaction, and the seismic response of OWTs was analyzed by using aero-servo-hydro-elastic coupled method. The running, park and emergency shutdown operational conditions were included. Results show that operational conditions significantly influence the deformations and internal forces of the support structure of wind turbines, and the principles are associated with the intensity of earthquakes. The oscillation velocity of the blade is considerably influenced by earthquakes. The amplitudes of shear and bending moment of critical section for the support structure may exceed those excited by extreme wind-wave under the combined excitation of wind, wave and seismic.