为研究主余震序列作用下近海单桩式风力机动力响应特性，以DTU 10 MW风力机为研究对象，构建地震-湍流风-波浪多物理场计算模型，并通过重复法及衰减法构造主余震序列，研究主余震序列对风力机动力特性的影响。结果表明：当地震正向冲击时，环境载荷主要影响塔顶前后向振动，地震载荷为塔顶侧向振动的决定载荷，可在一定程度上缓解环境载荷所造成的塔顶振动。主余震序列作用时相较仅主震或余震序列作用，风力机塔顶振动明显增强，塔架最大等效应力变大，应变能集聚现象更为明显。余震较强时，风力机余震阶段塔顶振动、最大等效应力及应变能集聚现象强于主震阶段。

In order to investigate the dynamic response characteristics of offshore monopile wind turbine under the action of mainshockaftershock earthquake sequence,the DTU 10 MW wind turbine was used as the research object to build a multiphysical field calculation model of seismicturbulent windwave,and construct the mainshockaftershock earthquake sequence by repetition method and attenuation method to study the effect of mainshockaftershock earthquake sequence on the dynamic characteristics of wind turbine. The results show that when the earthquake impacts forward,the environmental load mainly affects the anteriorposterior vibration of the tower top,the seismic load is the determining load of the lateral vibration of the tower top,which can mitigate the vibration of the tower top caused by the environmental load to a certain extent. When the mainshockaftershock earthquake sequence acts,compared with only the mainshock or aftershock earthquake sequence,the wind turbine tower top vibration is significantly enhanced,the maximum equivalent stress of the tower becomes larger,and the strain energy gathering phenomenon is more obvious. When the aftershock earthquake is stronger,the phenomena of tower top vibration,maximum equivalent stress and strain energy gathering of wind turbine in the aftershock earthquake phase are stronger than in the mainshock phase.

TK221

国家自然科学基金（51976131，52006148）；上海市"科技创新行动计划"地方院校能力建设项目（19060502200）