A moment-matching method for fragility analysis of transmission towers under straight line winds
A moment-matching method for fragility analysis of transmission towers under straight line winds
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DOI：
10.1016/j.ress.2023.109241
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
Saransh Dikshit;A. Alipour
中科院分区：
文献类型：
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作者：
Saransh Dikshit;A. Alipour
由于极端天气条件（例如德雷乔斯、飓风和其他极端风事件）导致输电线路系统故障，导致大面积停电。虽然确定因此类风事件导致输电线路组件发生故障的概率是评估与系统故障和系统弹性相关的风险的重要第一步，但由于与结构、线路跨度和负载相关的不确定性，脆弱性功能的开发可能是一项繁琐的任务。本文提出了一种新颖的力矩匹配技术，用于处理此类不确定性并估计输电塔系统的结构脆弱性。通过进行非线性屈曲分析来识别极限状态。风荷载模型能够考虑沿水平和垂直方向的相干性，之后可以通过考虑结构参数和风荷载的变化来对输电塔系统进行脆弱性分析。基于对案例研究塔系统进行的风洞测试，采用实际阻力系数进行分析。相邻塔的影响也被考虑以考虑更现实的边界条件。针对系统的两种状态呈现了不同风向的脆弱性曲线，其中包括具有平衡负载（即完整）的输电线路系统和具有不平衡力（即具有破损导体）的输电线路系统。
Failure of a transmission line system due to extreme weather conditions such as derechos, hurricanes, and other extreme wind events has caused major widely spread outages. While determining the probability of failure for transmission line components due to such wind events is an important first step for assessing the risk associated with system failure and system resilience, development of fragility functions can be a tedious task because of uncertainties associated with structure, line span, and loading. This paper presents a novel moment-matching technique for handling such uncertainties and estimating the structural fragility of a transmission tower system. Limit states are identified by carrying out nonlinear buckling analysis. Wind-load models are capable of accounting for coherence along the horizontal and vertical directions, after which fragility analysis for the transmission tower system can be carried out by considering variability in structural parameters and wind loads. Realistic drag coefficients were employed for analysis based on wind-tunnel tests carried out for the case-study tower system. The effects of adjacent towers was also considered to account for more realistic boundary conditions. Fragility curves for different wind directions are presented for two states of a system that includes a transmission line system with balanced loads (i.e., intact) and one with unbalanced forces (i.e., with broken conductors).