风力机塔架在地震激励下的动力学响应研究对保证风力机安全运行具有重要意义。基于有限元软件ANSYS和Wolf土-构耦合理论对Vestas1.65 MW风力机建立较高精度有限元模型，对是否考虑土-结构耦合（Soil-Structure Interaction,SSI）效应两种条件下进行瞬态动力学分析。选用摩根希尔（Morgan Hill）地震运动，土体选用软土物性参数。结果表明：考虑SSI效应会降低风力机塔架自振频率，塔架在地震激励下的塔顶位移响应、塔顶加速度响应、塔架Mises等效应力响应和塔架剪应力响应频率有较明显下降，塔顶加速度峰值减小6.7%，塔基承受剪应力增加73.5 MPa，增幅98.9%。因此，研究风力机结构抗震设计应考虑SSI效应。

The research on dynamic response of wind turbine tower under seismic load is of great significance to ensure the safe operation of the wind turbine.A seismic simulation model of high-accuracy finite element for the Vestas1.65 MW wind turbine is built based on ANSYS and Wolf theory for the soil-structure interaction，and the transient dynamics of the wind turbine is analyzed with and without the soil-structure interaction effect considered.The Morgan Hill earthquake is selected for the seismic load and soft soil properties are selected as soil properties for analysis.The results show that with the SSI effect considered,the natural frequency of the wind turbine tower will be reduced.Under the action of seismic load,the tower top displacement response,tower top acceleration response and tower shear stress response frequency will decrease significantly,peak acceleration at the top of the tower is reduced by 6.7%,and the tower foundation is subjected to shear stress increase of 73.5 MPa,an increase of 98.9%.Therefore,the SSI effect should be considered when studying the seismic design of a wind turbine structure.

TK83

国家自然科学基金（51676131，51176129）