地震作用下输电线路塔线耦合的动力响应数值分析  

NUMERICAL SIMULATIONS ON DYNAMIC RESPONSES OF A TRANSMISSION TOWER-CONDUCTOR COUPLING SYSTEM UNDER EARTHQUAKE ACTION

作　　者：卜祥航 曹永兴 梁黄彬 朱军 吴驰 刘凤莲 谢强[2,3] BU Xianghang;CAO Yongxing;LIANG Huangbin;ZHU Jun;WU Chi;LIU Fenglian;XIE Qiang(Sichuan Electrical Power Research Institute of SGCC,Chengdu 610041,China;Department of Structural Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Performance Evolution and Control for Engineering Structures,Ministry of Education,Shanghai 200092,China)

机构地区：[1]国网四川省电力公司电力科学研究院,成都610041 [2]同济大学建筑工程系,上海200092 [3]工程结构服役性能演化与控制教育部重点实验室,上海200092

出　　处：《工业建筑》2020年第8期128-133,共6页Industrial Construction

基　　金：国网四川省电力公司科技项目(521997170026)。

摘　　要：输电线路由基础、杆塔和架空导线组成,杆塔和架空导线的塔线耦合作用显著。为了研究地震作用下的塔线耦合作用,结合某220 kV输电线路工程,建立杆塔的单塔模型和三塔两跨的塔线耦联体系模型,并分别进行动力特性分析和地震时程响应分析,通过对比两个有限元模型的计算结果,发现:1)塔线耦联体系模型中杆塔频率小于单塔模型;2)低地震烈度下塔线耦联体系中杆塔地震响应高于单塔模型,而在高地震烈度下塔线耦联体系中杆塔地震响应出现低于单塔模型的情况;3)架空导线的质量效应使杆塔地震响应增大,同时架空导线可通过自身振动耗散一定的地震能量,这种非线性振动耗能减震效应随着地震动强度的增大而越发明显。Electricity transmission lines consists of transmission tower structure and conductors as well as ground wires.Coupling effects of the system are prominent.In order to study the influence of transmission lines on transmission tower under earthquake actions,two finite element models were established based on a 220 kV transmission project,including a single tower model and a tower-line coupling model.Dynamic characteristics analysis and seismic time history analysis were carried out for the two models.By comparing the results of the two models,it can be found that the frequency of transmission tower in the tower-line coupling model was less than that of single tower model.Seismic responses of the transmission tower in the tower-line coupling model with low seismic intensity was higher than that of the single tower model,while the result could be the opposite with high seismic intensity.The mass of transmission lines would amplify the seismic responses of transmission tower,while the nonlinear vibration of them could also dissipate some seismic energy,thus reducing the seismic responses of transmission tower.The nonlinear energy dissipation effects would become more and more obvious with the increase of seismic input intensity.

关 键 词：塔线耦联体系模型 单塔模型 地震响应 非线性 耗能减震效应 

分 类 号：TM75[电气工程—电力系统及自动化]