覆冰输电塔-线体系风致动力响应分析

依据流体诱发振动原理,结合已有覆冰计算模型,考虑降雨的分类,模拟了输电塔-线体系不同高度导线的覆冰和风荷载。以东北地区某输电塔为例,对覆冰输电塔-线体系在稳定风速激励下的动力响应进行分析,并与不考虑塔线耦联的导线舞动分析结果及覆冰塔线拟静力的分析结果进行对比,对塔位移、输电线位移、钢材应力进行了分析。研究结果表明:塔-线耦联体系对覆冰导线风振有很大影响,覆冰输电塔抗风设计安全度需要进一步提高。

Wind-Induced Dynamic Response Analysis of Iced Transmission Tower-Line System

In this paper,the freezing-rain-ice and wind loads on the transmission tower-line system are simulated with consideration of the model of freezing-rain-ice and the rain classification according to the theory of fluid induced vibration. Based on the principle of transmission tower design in northeastern area,the wind-induced dynamic response of iced transmission tower-line system has been compared with the dynamic response of transmission line wave and quasi-static analytical results. The displacements of tower and line,and the stress distribution of main member are calculated to investigate the behaviors of system. It can be concluded that coupled tower-line system should be taken into account to analyze the wind-induced dynamic response of iced transmission line and the design method in engineering needs to be modified.