大跨越输电塔-线在线路脱冰作用下的振动

英文篇名：ICE-SHEDDING INDUCED VIBRATION OF A LONG-SPAN ELECTRIC TRANSMISSION TOWER-LINE SYSTEM
中文刊名：振动与冲击
英文刊名：Journal of Vibration and Shock
作者：李黎 ; 夏正春 ; 付国祥 ; 梁政平
英文作者：LI Li1 ; 2 ; XIA Zheng-chun1 ; 2 ; FU Guo-xiang1 ; 2 ; LIANG Zheng-ping1 ; 3(1. School of Civil Engineering & Mechanics ; Huazhong University of Science & Technology ; Wuhan 430074 ; China ; 2. Hubei Key Laboratory of Control Structure ; Huazhong University of Science & Technology ; Wuhan 430074 ; China ; 3. China Power Engineering Consulting Groups Corporation ; Beijing 100011 ; China)
中文关键词：塔-线耦合 ; 线路覆冰 ; 线路脱冰 ; 振动 ; 有限元
英文关键词：tower-line coupling ; ice accretion ; ice shedding ; vibration ; finite element method
出版日期：2008-09-25
机构：华中科技大学土木工程与力学学院;
年：2008
期：09
出版单位：振动与冲击

摘要

输电线路覆冰后的脱冰动力分析十分复杂。以某1000 kV大跨越为工程背景,借助非线性有限元方法建立塔-线耦合模型。为了考虑线路覆冰的弯曲刚度,采用梁单元模拟覆冰,采用单元生死法模拟脱冰,分析塔-线体系对线路脱冰的动力响应。结果表明,线路覆冰后体系的低阶振型基本没有变化,而自振周期变长了;地线脱冰后体系的振动响应衰减较快,而导线脱冰后体系的振动响应衰减较慢。同时,输电塔的位移响应,脱冰50%比脱冰100%时小,而对跨中电线的跳跃幅值,脱冰50%比脱冰100%时大。
Dynamic analysis of transmission lines subjected to ice-shedding loads is very complex. Here, a 1000kV long-span electric transmission tower-line system is taken as the study object, and the tower-line coupling model built with nonlinear finite element method is proposed to calculate the dynamic response of the system subjected to ice shedding. In order to consider the equivalent bending stiffness of ice, a 3-D two-node beam element in parallel to each cable element is used to model accreted ice. In order to simulate the process of ice detachment from wires, the method of "element death" is used to model ice shedding. The result shows that the lower modal shapes of the tower-line system have no change after wires are accreted by ice, but the vibration period enlarged. It is also seen that the system vibration decays more quickly after ice on ground wires is shedded, compared to the vibration induced by ice shedding from conducting wires. In addition, compared two cases of ice-shedding 50% and ice-shedding 100%, the longitudinal displacement responses of the tower in the former case are smaller than those in the latter case; but on the contrary, the vertical displacements of the line at mid span in the former case are bigger than those in the latter case.

引文

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