输电铁塔结构受冰雪荷载作用的破坏原因

冰冻雨雪天气引起超过设计标准的覆冰荷载，使铁塔破坏和倒塌，在具体作用方式上又有所不同，可以大致分为将铁塔压坏、拉坏、扭坏、屈曲失稳破坏以及拉扭共同破坏等几种形式。从输电塔结构的结构形式着手，论述了其在冰雪荷载作用下产生破坏的原因及其力学角度的基本防护措施。

Failure Reason Analysis of Transmission Tower due to Sleet Load

When the thickness of transmission line regelation in frost or sleet weather more than the design value the following condition can occur: the conductor , ancher clamp ,pylon and so on cannot support the weight of sleet load and break fanilly. Such as the prong break of conductor, break of conductor, anchor clamp dropout, rupture, pylon lodge, local damaged and so on. The ice coating load that greater than design standard can lead the transmission tower break or collapse, the concrete type of action are differ. they can approximately split into the tower was crushed, failure by pull, torsion and unstability, draw and torsion break. From the structure form of transmission tower, the text discuss the reason of break due to sleet load and the basic protection form the aspect of mechanics.