输电塔纵向地震作用下抗震简化模型研究

Research on Simplified Seismic Model of Transmission Tower Under Longitudinal Seismic Action

纵向地震作用下,将输电塔简化为了广义单自由度模型。采用Newmark法的增量形式进行杆塔地震响应分析,并与实际输电塔结构的有限元模型在相同纵向地震作用下计算得到的响应进行比较。计算结果表明,简化模型通过逐步积分计算出的塔顶位移,略大于精细化模型在通用有限元软件中计算出的塔顶位移,差别较小;说明在纵向地震作用下,采用输电塔广义单自由度简化模型可以很好地替代原模型。

Under longitudinal seismic action,the transmission tower was simplified as a generalized single degree of freedom model.The seismic response of the simplified model was calculated using the incremental form of the Newmark method.And the calculation result was compared with the response calculated by the finite element model of the transmission tower under the same longitudinal seismic action.The calculation result indicates that the tower top displacement calculated by the simplified model through the stepwise integration method is slightly larger than that calculated by the refined model using general finite element software,and the difference is relatively small.This indicates that using the generalized single degree of freedom simplified model of transmission tower can effectively replace the original model under longitudinal seismic action.