利用风荷载下沿海地区高压输电塔脆性分析扩展极限塌陷面

IF 2.1 4区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Kyungrok Kwon, Youngjin Choi, Yangrok Choi, Whi Seok Han, Jeong Hun Kim, Jung Sik Kong
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引用次数: 0

摘要

在评估结构在风荷载作用下的脆弱性时,通常是在完好无损的条件下进行脆弱性分析。因此,老化输电塔的实际强度可能会受到影响,导致严重损坏。特别是在沿海地区长期使用的钢结构,有可能因腐蚀而导致性能下降。高压输电塔之一的 765 千伏输电塔比其他输电塔更高,因此在发生腐蚀时更容易受到强风的影响。本研究根据 765 千伏输电塔的使用寿命,对沿海地区 765 千伏输电塔的结构性能退化进行了调查。考虑到风攻角和材料特性等各种参数的不确定性,提供了容量分布。提出了一种考虑风况和空气动力参数不确定性的脆性评估流程。利用研究成果,我们创建了极限塌陷曲面,根据输电塔的使用寿命、风速和风攻角对其结构安全性进行评估。结果表明,腐蚀导致的结构安全性定量下降取决于使用寿命,最不利的风攻角为 0°。考虑到风速、风攻角和使用寿命,所提出的极限塌陷面有助于有效评估结构状况。因此,这项研究可作为现代输电塔结构评估的基础,以避免大城市电力中断。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Extended limit-collapsed surfaces using fragility analysis of high voltage transmission towers located in coastal areas under wind load
When evaluating the fragility of structures in response to wind loads, vulnerability analyses are often conducted under intact conditions. Therefore, the actual strength of aged transmission towers may be compromised, resulting in severe damage. Especially for steel structures used over a long period in coastal areas, there is a potential for performance degradation due to corrosion. One of the high-voltage transmission towers, the 765 kV transmission tower, is taller than other towers, making it more vulnerable to strong winds in the event of corrosion. In this study, the structural performance degradation of 765 kV transmission towers in coastal regions based on their service life was investigated. Capacity distributions were provided considering the uncertainties in various parameters, such as the wind attack angle and material properties. A fragility assessment process that accounts for uncertainties in the wind conditions and aerodynamic parameters is proposed. Using the research results, we created limit-collapsed surfaces to evaluate the structural safety of transmission towers based on their service life, wind speed, and wind attack angle. The results showed a quantitative decrease in structural safety due to corrosion depending on the service life, with the most unfavorable wind attack angle being 0°. The proposed limit-collapsed surface can help efficiently evaluate structural conditions considering wind speed, wind attack angle, and service life. Hence, this study can serve as a basis for the structural evaluation of modern transmission towers to avoid power disruptions in major cities.
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来源期刊
Advances in Structural Engineering
Advances in Structural Engineering 工程技术-工程:土木
CiteScore
5.00
自引率
11.50%
发文量
230
审稿时长
2.3 months
期刊介绍: Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.
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