断线张力下覆冰输电塔极限承载力研究  

ULTIMATE CAPACITIES OF TRANSMISSION TOWER WITH BROKEN WIRE LOAD AND ICE LOAD

作　　者：周骥 靳建明 ZHOU Ji;JIN Jianming(Hangzhou Branch of Zhejiang United Construction Design and Research Institute Co.,Ltd.,Hangzhou 330009,China;Zhejiang Urban Construction Survey and Research Institute Co.,Ltd.,Hangzhou 311112,China)

机构地区：[1]浙江江南工程管理股份有限公司,杭州310007 [2]浙江城建勘察研究院有限公司,杭州311112

出　　处：《低温建筑技术》2022年第3期119-123,共5页Low Temperature Architecture Technology

摘　　要：冰冻灾害下,覆冰荷载导致输电塔架的破坏较为严重,而断线张力是引起倒塔的主要因素。利用非线性有限元理论,针对覆冰500kV猫头式输电塔,研究了10种加载模式下的极限承载力和破坏形式。计算结果表明,不同的加载模式下输电塔的破坏形式可以分为塔架局部弯曲失稳破坏、加载点位置的强度破坏和整体失稳破坏3种。论述了覆冰荷载的增加对不同加载模式下输电塔架极限承载能力和破坏形式的影响,为进一步认识输电塔架的力学性能提供了参考。In frozen disasters,ice load leads to serious damage of transmission tower.Broken wire load is one of the most important factors,which could cause transmission tower collapse.Based on nonlinear finite element theories,the ultimate capacity and failure modes of 500kV cat-head transmission tower with ice load were studied in 10 different loading modes.The results show that the failure modes of the tower in different loading modes could be divided into three types,which are local bending instability,strength failure beginning from the bars near load point,and overall instability.There were some big differences for capacity and failure modes of the tower with different loading modes under the increasing ice load.The research may provide the understanding of mechanical properties for the tower.

关 键 词：输电塔 覆冰荷载 断线张力 极限承载力 

分 类 号：TU279[建筑科学—建筑设计及理论]