摘要
覆冰环境中的输电线路对气候条件敏感,在极端天气条件下易发生倒塔事故.与其他结构不同,输电铁塔结构在不同的气象条件下,动力特性表现出较大的差别.以西南地区某500kV大跨越酒杯型直线塔为研究对象,分析在是否考虑导线重量,不同覆冰厚度,是否考虑覆冰刚度的情况下,铁塔结构的动力特性.研究结果表明:铁塔覆冰对结构动力特性影响较大,不可忽略;当覆冰厚度较大时,可考虑覆冰对结构刚度的贡献.此结论可为高海拔地区的类似铁塔分析设计提供参考.
The transmission tower in the icing area is very sensitive to climate.When extreme weather approaches,the tower may collapse easily.The dynamic characteristics of transmission tower structure vary under different weather conditions.Taking a 500kV large-span tangent tower as the research subject,the dynamic characteristics of such structures are analyzed when the weight of wires,the icing stiffness of tower structure and the thickness of ice are considered.The results show that icing has a great impact on the dynamic characteristics of the tower structure;and it can not be neglected.When the ice is thick,the contribution of icing to the stiffness of the structure should be considered.This conclusion can provide a reference for the analysis and design of similar towers in high altitude area.
出处
《三峡大学学报（自然科学版）》
CAS
2013年第6期59-62,共4页
Journal of China Three Gorges University：Natural Sciences
基金
三峡大学人才科研启动基金(KJ2012B050)
关键词
输电铁塔
覆冰
动力特性
固有频率
transmission tower-line system
icing
dynamic characteristics
natural frequency
