输电塔线体系在地震动水平-摇摆耦合作用下的响应研究

Study of Seismic Response on Thetransmission Tower-line System Under Coupled Horizontal and Tilt Ground Motion

通过数值模拟对输电塔线体系在地震动水平-摇摆耦合作用下的响应进行了研究。采用有限元程序分别建立了单塔和塔线耦合体系的三维有限元模型,进行模态分析和动力时程分析。对单塔和塔线体系的动力特性和在水平、摇摆和水平-摇摆耦合地震作用下的响应时程分析结果进行了对比研究。结果表明,输电线对输电塔横导线方向和顺导线方向的地震响应的影响不同,将减小输电塔横导线方向的地震效应,而将增大输电塔顺导线方向的地震效应;相比单一水平地震作用,输电塔线体系在地震动水平-摇摆耦合作用下的响应更加显著。对于输电塔等高柔结构来说,抗震设计时考虑地震动摇摆分量的影响是很有必要的。

The seismic response of transmission tower-line system under coupled horizontal and tilt ground motion was studied by the numerical simulation.The models of single tower and tower-line system were established by a finite element software,and the dynamic characteristics of single tower and tower-line system were compared.Time history analyses of the seismic response of the two models under horizontal,tilt and coupled horizontal,and tilt ground motion were also compared.The experimental results show that the influence of transmission line on the seismic response of the transmission tower is different in the lateral and longitudinal directions.The line is beneficial to the seismic response of the tower in the lateral direction,which will increase the seismic response of the tower in the longitudinal direction.Compared with the single horizontal ground motion,the seismic response of the transmission tower-line system under coupled horizontal and tilt ground motion is more significant.It is necessary to consider the influence of tilt ground motion on the seismic design of high-flexible structures such as transmission tower.