滑坡灾害下500 kV铁塔安全性分析

Safety Analysis of a 500 kV Transmission Tower under Landslide Disaster

输电线路铁塔基础周围发生滑坡时,将引起铁塔基础的变形,威胁到输电线路的安全运行.采用有限元法运用ANSYS软件建立了500 kV输电铁塔仿真模型,模拟滑坡灾害下输电铁塔基础的变形,分析了不同工况输电铁塔的应力变化.结果表明:90°大风A腿水平滑移工况为滑坡灾害下铁塔基础变形的控制工况;输电铁塔转角外侧和顺线路方向基础周围发生滑坡时对铁塔的安全性影响大;铁塔塔材首先发生屈服破坏的位置处于铁塔第一道横隔材与其斜材的连接处,其次为铁塔塔脚处.

When a landslide occurs around the foundation of a transmission line tower,it will cause deformation of the foundation of the tower,which will threaten the safe operation of the transmission line.The simulation model of 500 kV transmission tower was established by using finite element method with ANSYS software.The variation of internal force of transmission tower under different working conditions was analyzed by simulating the deformation of transmission tower foundation under landslide disaster.The results show that the horizontal slip of the 90°wind with A leg is the control condition of the foundation deformation of the tower under the landslide disaster;the landslide around the outer corner of the transmission tower and the direction of the forward direction has a great impact on the safety of the tower;the first place where yield failure occurs is at the connection between the first transverse timber of the tower and inclined timber,the second place is at the foot of the tower.