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对2008年年初由于冰雪天气发生倒塌的南方某输电铁塔的构件可靠度进行了分析.以覆冰厚度、覆冰时的风速以及材料的强度为基本随机变量,用响应面法来模拟我国杆塔设计技术规定中梁单元的极限状态方程,它是随机变量的解析表达式.然后利用几何法来计算每个梁单元的可靠度指标,计算结果显示,在结构设计条件下,该输电铁塔单元可靠性较低;如果再考虑由于导线、地线的不均匀覆冰所引起的不平衡张力,铁塔某些薄弱处的可靠度指标相当小,塔具有相当大的失效风险.计算结果与事故原因分析结论是相吻合的.
The component reliability of a transmission tower in the south due to snow and ice collapsed in early 2008 was analyzed.The response surface method was used to simulate the design of tower and tower in China based on the thickness of icing, the wind speed during ice icing and the strength of material Which is the analytical expression of random variables.At the same time, the reliability index of each beam element is calculated by using the geometric method. The calculation results show that under the condition of structural design, the reliability of the transmission tower element, Lower; if we consider the unbalanced tension caused by inhomogeneous icing due to wire and ground, the reliability index of some weak places in the tower is quite small, and the tower has a considerable risk of failure.Calculation results and analysis of the causes of the accident Is consistent.