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Failure analysis of a transmission tower subjected to combined wind and rainfall excitations

机译：经历综合风和降雨激发的传输塔的故障分析

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摘要

Many transmission towers have collapsed during severe gales and thunderstorms, and these failures have traditionally been attributed simply to wind loading. This study attempts to reveal the full failure mechanism of tower structures under strong wind excitation considering the rainfall effect. First, the calculation of rain load for a tower-line system is provided. Then, an uncertainty analytical method for estimating the strength capacity and predicting the failure pattern of transmission towers induced by wind and rain loads is presented. Next, a real collapsed transmission line is considered to establish the finite element model, followed by the determination of the most vulnerable tower, which is then used to perform the uncertainty analysis. The results illustrate that the collapse basic wind speed considering the rainfall effect is smaller than the pure wind condition. In addition, the failure probability of the tower body is the largest, which is consistent with the deterministic method, whereas the most vulnerable tower began to fail from the tower leg in reality, indicating that the initial broken position of the transmission tower may not occur in the location with the largest probability and that the deterministic method is invalid in some cases. Finally, the influence of the wind attack angle and bundle number of transmission conductor is investigated. The most unfavorable wind attack angle is 90 degrees, and the rainfall effect becomes increasingly significant with increases in the bundle number; this relationship should be given particular attention.
机译：许多传动塔在严重的Gales和雷暴期间崩溃，并且这些故障传统上归因于风装。考虑到降雨效应，该研究试图揭示塔结构下塔结构的全部失效机制。首先，提供了塔线系统的雨量载荷的计算。然后，介绍了一种不确定的分析方法，用于估计强度容量和预测风力和雨量载荷引起的传动塔的故障模式。接下来，认为真实的折叠传输线建立有限元模型，然后确定最脆弱的塔，然后用于执行不确定性分析。结果表明，考虑降雨效应的崩塌基本风速小于纯风条件。此外，塔体的故障概率是最大的，这与确定性方法一致，而最脆弱的塔从塔腿开始失败，表明传输塔的初始损坏位置可能不会发生在具有最大概率的位置，并且在某些情况下确定性方法无效。最后，研究了风力攻击角度和束数的透射导体的影响。最不利的风力攻击角度为90度，降雨效果随着束号的增加而变得越来越重要;这种关系应该特别注意。

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