高压输电塔结构的疲劳寿命分析

输电塔结构是高负荷电能输送的载体,是一种重要的生命线工程。结构疲劳损伤被视为工程领域重要的破坏因素之一。选取500 kV海宁—乔司II回路输电线路上的ZSZH型塔为研究对象,依据Miner线性疲劳累积损伤理论和材料的S-N曲线,建立了一套完整的输电塔结构疲劳寿命分析方法。这种方法不仅重点强调了风荷载对输电塔疲劳现象的影响,同时也考虑输电塔结构在服役期内承受过的台风、覆冰、安装等一次性强荷载工况。通过对工程实例的仿真分析,表明该文方法可以准确、高效地预测输电塔结构的疲劳寿命,为今后进一步的工程应用奠定了基础。

Fatigue Life Analysis of HV Transmission Tower Structure

The structure of transmission tower is an important lifeline project as the carrier of high load power. Structural fatigue damage has been considered as one of the most vital destructive factors in civil engineering. Based on the Miner’s linear fatigue accumulation rule and S-N curve,the fatigue life analysis method for ZSZH tower in the 500 kV Haining- Qiaosi double circuit transmission line was proposed. In the fatigue analysis problem of transmission towers,this method not only emphasizes on wind loads,but also considers several extraordinary serious load cases during the design reference period,including typhoon,ice load,construction load and so on. The numerical simulation results demonstrate that this method is quite accurate and effective to predict fatigue life of the transmission tower,which lays a foundation for further engineering application in the future.