行波效应对大跨越输电塔-线体系纵向地震响应影响  

Traveling wave effect on longitudinal seismic response of a long-span power transmission tower-cable system

作　　者：魏奇科[1] 李正良[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《振动与冲击》2011年第10期236-240,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50678181)

摘　　要：由于特高压大跨越输电塔-线体系塔身高跨度大,仅考虑单塔及塔-线体系的一致地震输入是远远不够的。考虑地震波沿大跨越线路传播时引起的地震行波效应,建立了特高压大跨越输电塔-线体系精细的三维空间有限元模型,运用几何非线性动力时程分析方法,研究了纵向地震作用下大跨越输电塔-线体系的地震响应特性,并和一致地震动输入下的反应进行了对比。结果表明:行波效应既可以增加又可以减小塔身的地震响应,主要与地震动作用于大跨越两端输电塔的相位差有关;行波效应对导线跨中竖向位移响应影响十分明显,对导线内力响应影响很小。Because of high tower and long-span of a ultra-high voltage long-span transmission tower-cable system,it is not enough only to consider seismic responses of the system under the uniform excitation.Based on the established precise 3D finite element model of the ultra-high voltage long-span transmission tower-cable system,the longitudinal seismic responses characteristics of the system were studied under traveling wave excitation and compared with those under uniform excitation using the geometric nonlinear dynamic time history integration method.The results showed that the traveling wave excitation can increase,or decrease the seismic responses of the transmission tower,which is mainly related to the phase difference;the effect of traveling wave on the line＇s displacement responses is obvious in the vertical direction,but its effect on the line＇s axial force is not significant.

关 键 词：行波效应 相位差 输电塔-线体系 几何非线性 时程分析 一致输入 地震响应 

分 类 号：TU973[建筑科学—结构工程]