为分析摩擦阻尼器对近海单桩风力机结构抗震性能的影响，以单桩式NREL 5MW海上风力机为研究对象，基于有限元理论，建立三维多物理场模型，对多组实测地震下摩擦阻尼器在近海风力机结构抗震中的应用效果展开研究。结果表明：摩擦阻尼器对风力机塔顶振动具有显著控制效果，伪谱加速度最大时可使塔顶位移降低54.79%，但进入滑移状态后其无法复位的特性会导致风力机塔顶位移平均值无法恢复到震前状态；摩擦阻尼器可有效缓解因地震激励造成的塔壁应力集聚现象，Mises应力最大值降低17.96%；摩擦阻尼器对强伪谱加速度（PSA）地震导致的风力机塔顶位移及海床处弯矩控制效果更佳，而对弱PSA地震导致的结构响应控制效果则较为一般。

In order to explore the influence of friction damper on the antiseismic performance of single pile offshore wind turbine structure,taking the single pile NREL 5MW offshore wind turbine as the research object,based on the finite element theory,a threedimensional multiphysical field model was established to study the applicable effect of friction damper on the antiseismic performance of offshore wind turbine structure under multigroups of measured earthquakes.The results show that the friction damper has a significant control effect on the vibration of the wind turbine tower top,and the tower top displacement can be reduced by 54.79% at the maximum pseudospectra acceleration (PSA),but it cannot be reset after entering the slip state,which will lead to the failure of the average displacement of the wind turbine tower top to return to the preearthquake state.The friction dampers can effectively reduce the Mises stress concentration phenomenon of tower wall caused by seismic excitation,the maximum of Mises stress is reduced by 17.96%.The friction damper has better control effect on the displacement of wind turbine tower top and the bending moment of sea floor caused by strong PSA earthquake,while the control effect on the structural response caused by weak PSA earthquake is more general.

TK83

国家自然科学基金（51976131，51676131）；上海市“科技创新行动计划”地方院校能力建设项目（19060502200）