| 宋鹏彦,赵仰康,杨保卫.基于整体易损性的猫头型输电塔抗倒塌能力分析[J].计算力学学报,2023,40(5):710~717 |
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| 基于整体易损性的猫头型输电塔抗倒塌能力分析 |
| Anti-collapse capacity assessment of owl type transmission towers based on global seismic fragility analysis |
| 投稿时间：2022-05-25 修订日期：2023-07-20 |
| DOI：10.7511/jslx20230525007 |
| 中文关键词: 猫头型输电塔结构 倒塌极限状态 潜在失效杆件 抗倒塌能力 倒塌易损性 |
| 英文关键词:owl type transmission tower structure collapse limit state potential failure of bars anti-collapse capacity collapse fragility |
| 基金项目:中国地震局工程力学研究所基金(2019EEEVL0202);河北省自然科学基金青年基金(E2017201221)资助项目. |
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| 中文摘要: |
| 作为输电线路的主要组成部分,输电塔结构对地震作用非常敏感。本文以中国输电线路中常采用的猫头型输电塔结构为例,开展了输电塔结构整体抗地震倒塌能力分析。以某一实际单回路3个不同高度的直线塔为研究对象,基于OpenSees平台建立输电塔结构三维有限元模型,定义4个倒塌极限状态依据,选取20条远场地震动记录,采用增量动力分析(IDA)方法,得到4个倒塌极限状态依据下输电塔结构的倒塌点,进一步获得输电塔结构的倒塌易损性曲线及其潜在失效杆件,并评估其在不同水平设计地震作用下的倒塌裕度比。研究结果表明,猫头型输电塔的地震损伤主要集中在塔头位置;随着塔体高度的增高,猫头型输电塔抗地震倒塌能力减弱;猫头型输电塔在巨震作用下存在一定的倒塌风险。 |
| 英文摘要: |
| As a main component of transmission lines,the transmission tower structure is sensitive to seismic excitations.This study examines the seismic collapse resistance for owl-type transmission tower structures that were commonly used for China’ s transmission lines.To do this,three line-type towers with different heights that were included in a specific actual single circuit were used as study cases.Based on OpenSees platform,a three-dimensional finite element model of the transmission tower structure was established.Four collapse limit states were determined according to different criteria.Twenty far-field ground motion records were selected as earthquake inputs.The incremental dynamic analysis (IDA) method was used to obtain the collapse points of the transmission tower structure using the considered four limit states,and the potential failure of bars was found.In a further step,the collapse fragility curves and the collapse margin ratios conditioned on different design earthquake levels were evaluated for the transmission tower structure.The results show that the seismic damage of the owl transmission tower is mainly concentrated in the tower head position.The seismic collapse resistance of the owl transmission tower structure decreases with the increase of height.Moreover,the owl transmission tower has a certain risk of collapse under the effect of strong earthquakes. |
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