输电线路舞动试验及塔线体系舞动疲劳性能数值模拟  

Transmission line galloping test and numerical simulation of galloping fatigue performance of tower-line system

作　　者：杨宏伟 李军阔 王丽欢 郜帆 刘春城[2] 杨爱全 YANG Hongwei;LI Junkuo;WANG Lihuan;GAO Fan;LIU Chuncheng;YANG Aiquan(State Grid Hebei Economic Research Institute,Shijiazhuang 050000,China;School of Civil Engineering and Architecture,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]国网河北省电力有限公司经济技术研究院,河北石家庄050000 [2]东北电力大学建筑工程学院,吉林吉林132012

出　　处：《自然灾害学报》2022年第6期76-85,共10页Journal of Natural Disasters

基　　金：河北汇智电力工程设计有限公司科技成本项目(HZHTCG2021-09);国家自然科学基金项目(51278091,50978049)。

摘　　要：为揭示输电线路覆冰舞动机理,开展了覆冰导线舞动风洞试验,通过变化风速、风向、弧垂等参数研究了柔性覆冰导线舞动特性。研究表明:覆冰导线在风荷载作用下变形到平衡位置,并围绕平衡位置以多阶模态进行振动。覆冰导线顺风向平均变形和振幅最大,并随着风速的增大而增大。采用数值模拟方法建立了三塔四线耦合体系模型,给出了塔线体系舞动响应。计算结果显示:覆冰导线距离初始位置2 m处的平衡位置开始舞动,导线振幅不断增大,舞动轨迹呈椭圆形,导线竖直向振幅明显大于横向振幅。同时基于疲劳累积损伤准则进一步评估了输电杆塔关键节点的舞动疲劳损伤和疲劳寿命。研究发现酒杯塔线体系在舞动过程中上下曲臂交点位置是最易发生疲劳破坏的关键节点,在输电塔的设计过程中应充分考虑上下曲臂交点处的构件疲劳损伤,最后给出了输电塔主要关键节点的舞动疲劳使用寿命。In order to reveal the galloping mechanism of ice-coated conductors on transmission lines,the galloping wind tunnel test of ice-coated conductors was carried out. The galloping characteristics of flexible ice-coated conductors were studied by changing wind speed,wind direction,sag and other parameters. Research shows that the ice-coated wire deforms to an equilibrium position under wind load,and vibrates in multiple modes around the equilibrium position. The average deformation and amplitude of the ice-coated wire in the downwind direction are the largest,and increase with the increase of wind speed. A three-tower four-line coupled system model is established by numerical simulation,and the galloping response of the tower-line system is given. The calculation results show that the icing wire begins to dance at the equilibrium position at 2 m from the initial position,the wire amplitude continues to increase,the trajectory of the dance is elliptical,and the vertical amplitude of the wire is significantly greater than the horizontal amplitude. At the same time,based on the fatigue cumulative damage criterion,the galloping fatigue damage and fatigue life of the key nodes of the transmission tower are further evaluated. The study found that the intersection of the upper and lower curved arms of the wineglass tower line system is the key node that is most prone to fatigue failure during the galloping process. The fatigue damage of the components at the intersection of the upper and lower curved arms should be fully considered in the design process of the transmission tower. Finally,the galloping fatigue life of the main key nodes of the transmission tower is given.

关 键 词：输电线路 舞动 塔线体系 疲劳损伤 风洞试验 数值模拟 

分 类 号：TM751[电气工程—电力系统及自动化] TU4[建筑科学—土工工程]