特高压大跨越输电塔线风灾易损性准静态分析

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Abstract： Ultra-highvoltage（UHV）long-span（LS）transmisson lines，characterized bylarge tower heightsand long spans，are highly susceptibleto wind loads.Wind fragilityanalysis is anessential method to assess their reliability under wind-induced actions. Using an UHV-LS transmission tower in Anhui Province as acase study， this research applies random wind vibration response theory and China's current overhead transmission line loading specifications to determine the structural response distribution under wind loads.The analysis incorporates uncertainties in structural material properties to establish the probabilistic distribution of wind loadcarrying capacity.Performance levels are quantitatively evaluated using tower-top displacement and corrected inter-segment displacement angles as indicators，leading to the development of wind fragility curves.The results indicate that the quasi-static wind efect distribution of the transmission tower-line system can be obtained using probability-based methods for the first time.The fragility assessment shows that performance levels based on tower-top displacement are more conservative than those basedon modified inter-segment displacement angles. Additionally，as structural damage intensifies，the influence of material uncertainty on load-bearingcapacity becomes more pronounced. Overall wind fragilityanalysis shows that UHV towers exhibit good wind reliability under design wind loads，although their wind-induced failure shows britte characteristics.

Keywords： UHV transmission lines; long-span; wind fragility; performance levels; structural reliability

中国电力事业发展迅速，输电塔线体系是电力输送过程中的重要载体，但长期在自然环境中工作，易受强风灾害的影响，研究输电塔线的抗风性能，开展其在风灾下的易损性研究十分必要。（剩余13036字）