（1 武汉理工大学土木工程与建筑学院， 武汉 430070； 2 国网山东省电力公司， 济南 250000）

［摘要］强震下输电线路塔-线耦联效应和方向效应，为大跨输电线路的地震响应机理及抗震性能研究的关键。以某9度地震烈度区一典型耐张段塔-线体系为分析对象，采用非线性时程分析法，考察了单向地震作用下塔-线体系的地震效应系数及耦联效应系数。结果表明：纵向和竖向地震作用下，地震效应及导线的耦联效应显著，尤其对于耐张塔和直线杆塔的瓶口部位，设计中应予以重视。另外，通过将塔-线体系在单向地震作用下与三向地震共同作用下的动力响应进行比较，考察了塔-线体系在多向地震作用下的方向耦合机制。研究表明，多向地震作用下，塔-线体系的杆件应力在三向振型之间存在一定的耦合效应，采用CQC法具备一定的精度。

［关键词］输电塔-线体系； 地震作用； 非线性时程分析法； 耦联效应； 耦合效应

中图分类号：TU973-2文献标识码：A文章编号：1002-848X(2018)13-0057-06

Study on coupling mechanism and directional coupling effect between transmission tower and line under strong earthquake

Yuan Zhefeng1, Wang Dahai1, Xu Mingnan1, Sun Qigang2

(1 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China; 2 State Grid Shandong Electric Power Company, Jinan 250000, China)

Abstract:The coupling effects and directional effects of transmission tower and  line system are the focus of the studies on seismic response mechanism and seismic performance of transmission tower and  lines under strong earthquake. Based on a typical strain section of transmission tower and line system in 9 degree seismic intensity region, the coefficient of seismic effect and the coupling effect  were investigated by the nonlinear time-history analysis under one-dimensional earthquake action. The results show that the seismic effect and coupling mechanism of conductors are remarkable under the longitudinal and vertical earthquakes, especially for the bottle mouth of typical strain tower and straight line tower, which should be paid attention to in the design. Furthermore, by comparing the dynamic responses of the transmission tower and  line system under one-dimensional earthquake and three-dimensional earthquakes, the directional coupling effect of the system was studied under multiple-dimensional earthquake. The study shows that there is certain coupling effect between the three vibration modes for members′ stresses of the system, which can be calculated by the complete quadratic combination method (CQC) with certain precision.

Keywords:transmission tower and  line system; earthquake action; nonlinear time-history analysis method; coupling mechanism; coupling effect 

*国家自然科学基金（51478373;51578434）。

通讯作者：汪大海，博士，副教授，博士生导师，一级注册结构工程师，mail:wangdahai@whut.edu.cn。