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| 考虑锈蚀损伤影响的输电塔洪水易损性分析 |
| Flood-fragility analysis of transmission towers considering corrosion induced damage effects |
| 投稿时间：2024-12-09 修订日期：2025-01-07 |
| DOI： |
| 中文关键词: 锈蚀损伤 洪水冲击 输电塔结构 易损性分析 损伤极限状态 |
| 英文关键词:Corrosion damage flood impact transmission tower structure fragility analysis damage limit state |
| 基金项目:国家电网有限公司科技项目(5700-202433233A-1-1-ZN). |
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| 中文摘要: |
| 作为电网输电系统中的重要组成部分，输电塔结构对洪水的水平冲击作用非常敏感。本文以实际输电线路中常采用的输电塔为对象，开展了考虑锈蚀损伤影响的输电塔结构洪水易损性分析。选取一实际输电塔为研究对象，基于SAP2000平台建立输电塔结构三维有限元模型。进行了不同洪水深度以及不同锈蚀条件下的输电塔洪水静力推覆分析，得到不同损伤程度的破坏特征荷载，进一步基于Monte-Carlo模拟分析，考虑洪水荷载的不确定性，计算得到了输电塔结构的洪水易损性曲线。研究结果表明：洪水深度以及锈蚀程度会显著影响输电塔的损伤破坏时所需要的洪水荷载的大小，随着洪水深度2m增加到5m以及锈蚀程度0%增大到40%，不同损伤程度的破坏荷载显著降低，下降比例在11.26%-41.09%；输电塔的洪水易损性也会显著增长， 4m深度的洪水条件下，40%的锈蚀率可带来64.6%的中等损伤的易损性增大。 |
| 英文摘要: |
| As an important component in the power grid transmission system, the transmission tower structure is very sensitive to the horizontal impact of floods. In this paper, taking the transmission towers commonly used in actual transmission lines as the object, the flood vulnerability analysis of the transmission tower structure considering the influence of corrosion damage was carried out. A practical transmission tower was selected as the research object, and a three-dimensional finite element model of the transmission tower structure was established based on the SAP2000 platform. The static pushover analysis of the transmission tower under floods with different flood depths and different corrosion conditions was conducted, and the failure characteristic loads with different damage degrees were obtained. Furthermore, based on the Monte-Carlo simulation analysis and considering the uncertainty of flood loads, the flood vulnerability curves of the transmission tower structure were calculated. The research results show that the flood depth and the corrosion degree will significantly affect the magnitude of the flood load required when the transmission tower is damaged. As the flood depth increases from 2m to 5m and the corrosion degree increases from 0% to 40%, the failure loads with different damage degrees are significantly reduced, with the decline proportion ranging from 11.26% to 41.09%; and the flood vulnerability of the transmission tower increases significantly. Under the flood condition with a depth of 4m, a corrosion rate of 40% can lead to a 64.6% increase in the vulnerability of moderate damage. |
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