不等高输电塔线体系风致动力响应分析

以山区常用输电塔5A-ZBC2为基础,建立了山区的不等高输电塔线体系。考虑到高差的不断变化以及不同方向攻角风荷载的作用,运用随机模拟风振分析方法对其进行了分析。结果表明,位于山顶的输电塔顶位移均值最大;位于山坡的次之;而位于山底的最小。而对不平衡张力来说,位于山坡的塔所受的不平衡张力最大;位于山顶的塔次之;位于山底的塔最小。随着高差的增大,塔顶位移和不平衡张力增大。塔顶位移主要受导线风荷载影响,而塔顶速度和加速度与塔的一阶振型有关,导线振动与荷载激励相关。

Analytical Study of Wind-induced Vibration of a Transmission Line System in Mountainous Area

The finite element model of multi-tower-line coupled system in a mountainous area is established, which is based on the 500kV 5A-ZBC2 transmission tower. The time histories of wind speed acting on transmission tower-line system are simulated with the harmony superposition method. This paper discusses the mean displacement values and the unbalanced tensions of towers which are in different locations of the mountain. The vibration frequency spectrum of tower and line is also discussed. We conclude out that the mean displacement value of tower which is in the top of mountain is maximal. However, the unbalanced tension of tower which is in the hillside is maximal.