塔线体系脱冰跳跃动力特性实验研究  

Experimental study on dynamical properties of tower-line systems induced by ice-shedding

作　　者：谢献忠[1] 李丹[1] 黄伟[1] 刘赛 

机构地区：[1]湖南科技大学土木工程学院,湘潭411201

出　　处：《应用力学学报》2017年第5期855-861,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(11272119)

摘　　要：基于动力相似理论,以湖南某220kV输电线路为工程原型,设计了缩尺比为1:20的两档塔线体系实验模型。采用程控方式控制模拟冰荷载脱落,实现了拉链式脱冰和同时脱冰、整档脱冰和局部脱冰等6种工况。通过对这些工况下输电导线位移响应与应力响应的测试和分析可知:整档同时脱冰是一种最危险的工况,最大的跳跃高度可达跨度的2.02%。整档脱冰工况下的动应力峰值均比脱冰前的覆冰静应力要小,应力减幅可达5%以上;局部脱冰工况下的动应力峰值则略大于覆冰静应力,但应力的增幅不会超过1.33%。这些结论可为塔线体系的强度和刚度设计提供参考。Taking the 220 kV transmission line in Hunan province as the prototype, a test model of double-span tower-line system with scale ratio of 1:20 is designed on the basis of dynamic similarity theory. A program is developed to control the shedding of ice load, and different working conditions including zippered and simultaneous ice-shedding in entire or part span can be simulated. The displacement and stress response of transmission line under these working conditions are tested and analyzed. According to the results of experimental study, the most dangerous ice-shedding condition is the simultaneous ice-shedding in entire span, and the biggest jump height can reach more than 2% of the span. The peak dynamic stress under the condition of ice-shedding in entire span is smaller than the static stress of ice load, and stress damping can reach more than 5%. The peak dynamic stress under the condition of ice-shedding in part span is slightly bigger than the static stress of ice load, but the increase of stress will not exceed more than 2%. The research conclusion in this paper may provide the design basis of strength and stiffness of tower-line systems.

关 键 词：输电线路 相似理论 脱冰 瞬态响应 模型实验 

分 类 号：O322[理学—一般力学与力学基础] TM75[理学—力学]