1000kV角钢塔地震模拟振动台试验研究  

Shaking Table Test on 1 000 kV Angle Steel Transmission Tower

作　　者：谢强[1] 白杰[1] 薛松涛[1] 秦庆芝[2] 

机构地区：[1]同济大学土木工程学院,上海市杨浦区200092 [2]华北电力设计院工程有限公司,北京市西城区100120

出　　处：《电网技术》2013年第1期58-64,共7页Power System Technology

基　　金：教育部霍英东教育基金会优选资助课题(114021);国家电网公司科技项目(2008-508)~~

摘　　要：为分析地震作用下1 000 kV特高压角钢输电塔动力反应特点以及导、地线质量对该塔架结构动力反应的影响,开展地震模拟振动台试验。选取4种不同类型的地震动输入,针对单塔及单塔悬挂集中质量进行8度烈度水准下的动力反应测试。试验结果表明:该型输电塔悬挂集中质量块后顺线路方向自振频率降低了2%,横线路方向自振频率降低了17%。对于绝缘子采用V型悬挂方式的杆塔结构,在计算塔动力特性时,垂直线路方向需考虑绝缘子连接方式及导线质量的影响。因该型输电塔结构横担较长,高宽比较小,地震反应有显著空间耦合性,地震作用下结构的扭转反应较易激起。总体而言,导线质量对输电塔抗震是有利的,塔线体系动力分析时考虑导线质量的影响将会更加真实地估计结构杆件内力。To analyze seismic response characteristics of 1 000 kV angle steel transmission tower and the impact of the qualities of conductors and ground wire on dynamic response of tower structure, shaking table tests were carried out. Under four types of input ground motions the seismic response testing for single-tower with and without lumped mass that equals to the sum of all mass of conductors and ground wires under seismic intensity 8 were performed and compared. Experimental results show that the first natural vibration frequencies of the tower with lumped mass was reduced by 2% in the direction along the transmission line and by 17% in the direction transverse the transmission line than those of the tower without lumped mass in the two directions. For the tower structure using V-shaped suspension mode of insulators the impact of both connection mode of insulators and conductor mass should be considered in the calculation of the dynamic property of the tower in the direction transverse transmission line Due to the longer cross arm of 1 000 kV transmission tower and the smaller height-width ratio of the cross arm, there is evident space coupling in the seismic response, so under the action of earthquake the torsion vibration mode would contribute a lot to the dynamic responses. In general, the mass of conductors is favorable to anti-earthquake of transmission tower, and during dynamic analysis on the tower-conductor system it is more reasonable to consider the impact of the mass of conductors in the evaluation of internal force of structural members.

关 键 词：1000KV输电线路 角钢塔 振动台试验 动力特性 地震反应 

分 类 号：TM752[电气工程—电力系统及自动化]