中文摘要：

为研究输电塔的动力特性,以新密市煤炭局某一输电线工程为背景,利用ANSYS有限元分析软件建立鼓型输电塔的三维模型.研究了输电塔固有模态及在3种典型地震作用下的瞬态分析.由振型的多样性显示鼓型输电塔的动力特性较为复杂;在地震激励下,结构横担下局部区域位移和加速度均较大,显示局部刚度较小;在水平方向上,El-centro波对输电塔的加速度影响比其他两种地震波要大.研究结果为鼓型输电塔的结构优化、修改和加固提供了可靠的理论依据.

英文摘要：

To study the dynamic characteristics of a transmission tower,a three dimensional space model of a drum type transmission tower was established using the general finite element software ANSYS based on a transmission line engineering of the Coal Authority in Xinmi.The inherent characteristics and transient analysis of the transmission tower under three typical earthquakes were studied.In addition,the diversity of vibration mode shapes represent the complexity of the dynamic characteristics of the transmission tower with a drum type,the displacements and accelerations of the local area under tower cross-arm were all large,which indicates that local stiffness is smaller under the seismic excitation.In the horizontal direction,the acceleration of the transmission tower is bigger under El-centro wave than that of other two kinds of seismic waves.The analysis provides a theoretical basis for the optimal design,modification and reinforcement of the transmission tower with a drum type in the future.