Typhoon- and temperature-induced responses of a cable-stayed bridge

IF 2.1 4区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Advances in Structural Engineering Pub Date : 2024-04-10 DOI:10.1177/13694332241246378
Qiang Jing, Yushi Shan, Lu Zhang, Yu Yan, Zili Xia, Yong Xia
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Abstract

Long-span bridges are subjected to wind and temperature actions. Wind action is generally the governing load of long-span bridges in design, while temperature action is also significant. Accurate separation of typhoon- and temperature-induced responses is thus necessary for in-depth investigation of their effects and comprehensive evaluation of structural performance. This paper separates the temperature- and typhoon-induced responses of the Qingzhou Bridge by using a unified global analysis approach. The field-monitored meteorological data and structural responses collected from the structural health monitoring system installed on the bridge are analyzed in detail, with emphasis on the comparison of those during typhoon Higos (Signal No. 9) and a typical sunny day after the typhoon. Results show that the quasi-static variation of displacement and stress responses are higher on a typical sunny day than those during the typhoon period, which is out of intuition. Through the unified analysis, the temperature-induced responses are calculated, and the typhoon-induced responses can be separated. The temperature- and typhoon-induced longitudinal displacement, mid-span deflection, and stress of the girder are compared. The temperature-induced response accounts for a large part of the total quasi-static recording either on a typical sunny day or during the typhoon period, whereas typhoon caused significant dynamic responses. The typhoon-induced quasi-static and dynamic responses are also in good agreement with the wind tunnel test results. This case study demonstrates the effectiveness of the unified global analysis in separating the temperature effect.
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台风和温度对斜拉桥的影响
大跨度桥梁受到风力和温度作用的影响。风作用通常是大跨度桥梁设计中的主要荷载,而温度作用也很重要。因此,要深入研究台风和温度作用的影响,全面评估结构性能,就必须准确分离台风和温度作用。本文采用统一的全局分析方法,将青州大桥的温度和台风诱导响应分离开来。本文详细分析了现场监测的气象数据和安装在大桥上的结构健康监测系统采集的结构响应,重点对比了台风 "黑格斯"(9 号信号)期间和台风后典型晴天的响应。结果表明,典型晴天的位移和应力响应的准静态变化高于台风期间的位移和应力响应,这与直觉不符。通过统一分析,可以计算出温度引起的响应,并将台风引起的响应分离出来。比较了温度和台风引起的大梁纵向位移、跨中挠度和应力。在典型的晴天或台风期间,温度引起的响应占准静态总记录的很大一部分,而台风引起的动态响应很大。台风引起的准静态和动态响应与风洞试验结果也十分吻合。该案例研究证明了统一全局分析在分离温度效应方面的有效性。
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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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