多点激励下输电塔-线体系的侧向地震反应分析

建立了输电塔-线体系三维有限元模型，并考虑了导(地)线的几何非线性特征；提出了依据现行设计规范模拟输电塔-线体系多点地震动时程；利用非线性时程分析方法研究了该体系在多点激励下的侧向反应特性，并与一致激励、仅考虑行波效应激励、仅考虑相干效应激励下的反应情况进行比较。结果表明，一致激励情况下输电塔-线体系不能得到最不利响应；多点激励增加了输电塔的地震响应，同时多点激励明显放大了导(地)线的侧向位移响应，这些均与行波波速和相干模型关系很大。由此得出结论：为得到输电塔-线体系的最不利响应，须准确估计行波波速，输电塔-线体系考虑多点激励的影响十分必要。

Lateral Response of Transmission Tower-line System Under Multiple Support Excitations

A three-dimensional finite element model of transmission tower-line system considering the geometric nonlinearity of transmission line was established, and the multiple support seismic time history of the transmission tower-line system was generated based on the Code for Design of Seismic of Electrical Installations, and the lateral response of the system was analyzed based upon nonlinearity time history integration method on multiple support excitations, and the comparison among multiple support excitation, uniform excitation, the excitation considering traveling-wave effect only and the excitation considering coherency effect only was carried out. The result indicates that uniform ground motion does not provide the most critical case for the response calculations, and the multiple support excitation increases the response of the transmission tower and has a significant effect on the lateral displacement of transmission lines, and those all depend on the traveling-wave velocity and coherency model. The conclusions are that a representative analysis of transmission tower-line system can be obtained from an accurate estimation of traveling-wave velocity, and considering the multiple support excitation effect is very necessary to the transmission tower-line system.