基于塔-线体系的输电塔覆冰加固有限元分析

Finite Element Analysis Based on Tower-line System of Ice-covering Reinforcement of Transmission Towers

为了解决输电线路覆冰后输电塔荷载增加引发的倒塔等问题,以国内南方某山区500 kV线路为例,建立了塔-线体系有限元模型,在对塔-线体系进行覆冰有限元分析确定薄弱环节的基础上,有针对性地加固改造并对其进行了抗风能力评估。分析结果表明,在确定输电塔薄弱环节的基础上,采用组合截面构件加固,通过逐次加固的方法有利于有效提高线路覆冰极限,改善其抗风稳定性。

In order to handle tower collapse due to load increase after ice-covering of transmission lines, the 500 kV lines in rural areas in China is taken as an example and finite element model for tower-line system is established. On the basis of ascertaining weak links by finite element analysis of ice-covering on tower-line system, tower-line system is reinforced and evaluated in terms of wind resistance. The analysis result shows that the approach of adopting components reinforcement of compound section and successive reinforcement on the basis of ascertaining weak links of transmission tower can effectively improve ice-covering limit and stability in wind resistance.