横线向水平-摇摆地震下输电塔线体系动力响应  

Seismic Response of Transmission Tower-line System Under Lateral Coupled Horizontal and Rocking Ground Motion

作　　者：魏文晖[1] 蒋祉涵 刘坤 王浩[1] WEI Wen-hui;JIANG Zhi-han;LIU Kun;WANG Hao(Hubei Key Lab of Road Bridge and Structure Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070

出　　处：《武汉理工大学学报》2019年第10期26-32,共7页Journal of Wuhan University of Technology

基　　金：国家自然科学基金面上项目(51178362,51678462)。

摘　　要：为探究受到横线向水平-摇摆耦合地震作用时,输电塔线体系地震响应,进行了理论和试验分析。通过对比单摆式地震仪在水平和竖向地震动作用下响应的差异,利用小波分析,从原始水平地震记录中提取出摇摆分量。推导出在横线向水平和摇摆耦合地震作用下的输电塔线体系动力方程,其中,考虑了由摇摆转角位移产生的附加P-Δ效应。并基于某实际输电塔线体系,制作了单塔和三塔两线体系缩尺模型,进行了振动台试验。结果表明:理论分析与试验结果基本吻合,验证了理论推导的正确性。摇摆转角位移产生的附加P-Δ效应将导致显著的非对称位移。导线对塔架主体结构有减振效果,但是这种效果会被摇摆分量弱化。To obtain earthquake response of transmission tower-line system under laterally coupled horizontal and rocking(CHR)ground motion,theoretical analysis and shaking table tests were carried out.Firstly,utilizing wavelet analysis,the rocking component was acquired from the original seismic wave by comparing different responses of single-pendulum seismograph under horizontal and vertical ground motions.Then,the dynamic equation for the transmission tower-line system under lateral CHR ground motion was derived,and the extra P-Δeffect due to ground rocking displacement was included in the equation.With the prototype of a true transmission tower-line system,the shaking table tests of a scaled single tower and a tower-line system composed of three towers and two lines were carried out.Theoretical and experimental research results indicate that the theoretical calculation results are consistent with the results of the shaking table test,which verifies the accuracy of the theoretical analysis.The extra P-Δeffect due to ground rocking displacement causes a notable asymmetric displacement.Transmission lines can weaken the tower seismic response,but the rocking component would reduce this weakening effect.

关 键 词：摇摆地震动 输电塔线体系 非对称位移 振动台试验 小波分析 

分 类 号：TU398.7[建筑科学—结构工程]