摘要
高压输电线路在强风荷载用下出现倒塔的情况时有发生,静力风荷载的设计方法已表现出一定的局限性。通过利用Davenport风速功率谱模拟形成输电塔不同高度处风荷载时程,并施加相应位置,得出输电塔最大位移时程曲线、输电塔最大应力单元曲线、导线弧垂最低点位移时程曲线和导线最大应力时程曲线;结果表明:动力响应情况下的上述指标均大于静力风荷载下的相应指标。导线轴向拉力时程曲线存在一定的不同步位移情况,增加了输电塔的不平衡受力情况,使得输电塔线体系受力更加复杂。
The collapse accidents for high-voltage transmission lines used to happen under strong wind action in recent years. The design methods for static wind load have shown some limitations. The Davenport wind power spectrum was used to simulate the wind load time-history at different heights of the transmission tower and applied to the corresponding positions. The curve of the maximum displacement time history of the transmission tower, the maximum stress curve of the transmission tower, the displacement time-history curve of the lowest point of the conductor sag and the time-history curve of the maximum stress of the conductor were obtained. The results showed that the above indicators under dynamic response were larger than those under static wind load. There was a certain unsynchronized displacement in the time-history curve of the axial tension of the conductor, which increased the probability of the unbalanced force of the transmission tower and made the stress condition of the transmission tower line system more complicated.
作者
裴慧坤
陈城
林国安
张有佳
PEI Huikun;CHEN Cheng;LIN Guoan;ZHANG Youjia(Shenzhen Power Supply Bureau,Shenzhen 518000,China;Architecture Engineering College,Northeast Dianli University,Jilin 132012,China)
出处
《工业建筑》
CSCD
北大核心
2019年第12期25-30,41,共7页
Industrial Construction
基金
国家自然科学基金项目(51508074)
南方电网科技项目(090000KK52170020)
关键词
风荷载
输电塔线体系
动力响应
有限元分析
wind load
transmission tower line system
dynamic response
finite element analysis
