摘要
研究覆冰情况下输电塔的承载力和合理构造,具有重要的工程和社会意义。本文以500 kV酒杯型输电塔为例,建立有限元分析模型,考虑输电塔结构的几何非线性和材料非线性,计算在自重、覆冰和风荷载及正常与断线导线张力作用下,输电塔结构的承载力。通过比较18种荷载组合下输电塔杆件应力和位移,确定出输电塔结构的薄弱部位,并对其进行优化设计,在横担和塔身处添加斜杆和水平支撑,并调整塔颈形状,验算结果表明,优化设计后的塔型,其整体刚度和承载力均有大幅度提高。
The bearing capacity analysis of iced transmission tower structure is important both in theory and engineering practice. This study takes 500 kV cup type beeline tower as an example to establish the spatial finite model of the tower, which is used for structure analysis under the dead load, ice load, wind load and conductor tension. The stress, strain, and displacement are obtained by analyzing the model under combinations of 18 kinds of loads. Finally, the most unfavorable working position of the transmission tower are found out based on the result of calculating. Optimizing design is undertaken by setting up supports at cross-arm and tower body and changing the form of tower neck. The calculation proved that the stiffness and capacity of the transmission tower has improved greatly.
出处
《华中科技大学学报（城市科学版）》
CAS
2010年第1期64-69,共6页
Journal of Huazhong University of Science and Technology
关键词
输电塔
承载力
覆冰
风荷载
有限元法
几何非线性
材料非线性
transmission tower
bearing capacity
iced
wind load
finite element method
geometric nonlinearity
material nonlinearity
