输电塔在断线荷载作用下的动力响应

摘要

Nowadays, many researches on dynamic responses of transmission tower under the effect of ruptured wire loads are assumed that wires break at the same time. Nevertheless, the majority of wires fragile condition is that wires break not at the same time. According to this problem , dynamic responses caused by wires breaking simultaneously and unsimidtaneously were analyzed and calculated by finite element method, so that some dynamic responses laws were acquired. The results indicated that the responses caused by the wires ruptured unsimultaneously were much larger , comparing with responses resulted from wires ruptured at the same time. However, the tower design code carried out at present just regards broken wire loads as the static ones , ignoring the dynamic effects caused by ruptured wire loads , so it's hoped that the research in this paper could provide references for the code.%目前,许多有关输电塔在断线荷载作用下的响应分析,都假定多根导线同时断裂,然而大多数情况下多根导线并不是同时断裂的.针对这个问题,本文采用有限元分析方法,对导线同时断裂和不同时断裂所引起的动力响应进行了分析计算,得到了不同情况下输电塔的动力响应规律.结果表明,导线断裂存在时间差时所引起的动力响应,比导线同时断裂引起的动力响应更加剧烈.然而,目前施行的杆塔设计规范,将断线荷载视为静力荷载,并未考虑断线荷载引起的动力效应,望本文内容可以为现行规范提供参考.