高耸的风力机塔架结构属于典型的顶部附有大集中质量的细长柔性体的力学结构，相比传统建筑结构差异性较大，极易受到地震载荷影响。基于有限元分析软件ABAQUS建立风力机塔架、基础平台和土体模型，通过FAST导出风轮非定常推力，作用在塔顶机舱，土体底部施加地震加速度时间序列，进行风力机结构模态分析、稳定性分析和动力学响应分析。研究表明：塔架主要的运动形式为摇摆运动和弯曲振动；塔架一阶固有频率为0.290 Hz，大于风轮的额定旋转频率0.202 Hz，因此叶片旋转不会引起风力机塔架发生共振；风载荷作用下，塔架发生横向屈曲，屈曲位置位于塔架底部且随模态阶数增大而逐渐向上发展，屈曲因子较大；地震载荷作用下，塔架发生纵向屈曲，屈曲位置同样位于塔架底部且随模态阶数增大而逐渐向上发展，较风载荷发生屈曲区域相对更大，屈曲因子相对较小。

The tower structure of towering wind turbine is a typical mechanical structure with a slender flexible body with a large concentrated mass at the top.Compared with traditional building structures,it is highly susceptible to seismic loads.Based on the finite element analysis software ABAQUS,models for the wind turbine tower,foundation platform and soil are established.Through FAST,the unsteady thrust of wind turbine is derived,acting on the nacelle on the top of the tower,and the seismic acceleration time series is applied on the bottom of the soil to conduct the modal analysis,stability analysis and dynamic response analysis of wind turbine structure.The following conclusions are drawn: the main motion forms of the tower are rocking motion and bending vibration.The firstorder natural frequency of the tower is 0.290 Hz,which is greater than the rated rotational frequency of the wind turbine of 0.202 Hz.The rotation of the blade does not cause the wind turbine tower to resonate.Under the wind load,the tower undergoes lateral buckling,and the buckling position is located at the bottom of the tower and gradually develops upward with the increase of the modal order,with relatively large buckling factor.Under the action of seismic load,the longitudinal buckling of the tower occurs,and the buckling position is also located at the bottom of the tower and gradually develops upward as the modal order increases.The buckling zone is relatively larger than the wind load,and the buckling factor is relatively small.

TK83

国家自然科学基金（51676131）；国际(地区)合作与交流项目（51811530315）；上海市“科技创新行动计划”地方院校能力建设项目（19060502200）；上海市科学技术委员会项目(13DZ2260900)