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特高压长悬臂输电塔横担结构竖向地震易损性分析
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Fragility Analysis on Vertical Earthquake of UHV Long Cantilever Transmission Tower Cross-arm Structure
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    ±800 kV特高压长悬臂输电塔横担结构属于高位水平长悬挑结构,对竖向地震作用比较敏感,亟须开展横担结构的竖向地震易损性分析研究.鉴于此,提出一个考虑多重性能水准的特高压长悬臂输电塔横担结构竖向地震易损性分析框架.首先,以某特高压长悬臂输电塔为研究对象建立有限元模型,分析了结构的竖向动力特性;其次,根据横担结构根部主材的应力比建立横担结构轻微、中度和严重破坏时的多重性能水准;最后,基于概率地震需求模型对横担结构开展竖向地震易损性分析.分析结果表明:长悬臂输电塔在竖向地震作用下受高阶振型影响显著,对结构竖向响应贡献显著的前三阶竖向模态依次为第16、26和29阶模态;在竖向地震作用下,横担根部主材是横担结构的主要受力杆件;与考虑横担结构根部拉弯主材强度破坏相比,在给定竖向地震动强度下,考虑压弯主材失稳破坏的横担结构失效概率明显较大.

    Abstract:

    The ±800 kV ultra high voltage (UHV) long cantilever transmission tower cross-arm structure belongs to a high-level horizontal long cantilever structure sensitive to the vertical seismic effect. It is urgent to conduct vertical seismic fragility analysis research on cross-arm structures. To address this, a framework for vertical seismic fragility analysis, considering multiple performance levels, was proposed for the UHV long cantilever transmission tower cross-arm structure. Firstly, a finite element model was established with the UHV long cantilever transmission tower as the research object, and the vertical dynamic characteristics of the structure were analyzed. Secondly, based on the stress ratio of the main component at the end of the cross-arm structure, multiple performance levels for slight, moderate, and severe damage to the cross-arm structure were established. Finally, a vertical seismic fragility analysis based on a probabilistic seismic demand model was carried out for the cross-arm structure. The analysis results show that the long cantilever transmission tower is significantly affected by higher-order vibration modes under vertical earthquake, and the first three vertical modes that contribute significantly to the vertical response of the structure are the 16th, 26th, and 29th modes, respectively. Under vertical seismic action, the end main component is the main load-bearing member of the cross-arm structure. Compared with considering the strength failure of the main component in tension bending at the end of the cross-arm structure, the failure probability of the cross-arm structure considering the instability failure of the main material in compression bending is significantly higher under the given vertical seismic intensity.

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李正良 ,聂元晨 ,王涛 ?,吴凤波 .特高压长悬臂输电塔横担结构竖向地震易损性分析[J].湖南大学学报:自然科学版,2025,52(1):84~92

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  • 在线发布日期: 2025-01-22
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