考虑多RC桥柱不同腐蚀破坏模式的沿海桥梁地震易损性分析

IF 6.5 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Zhong-Kui Cai , Wei Yuan , Suchao Li , Xiaolan Pan , Zhi Zheng
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引用次数: 0

摘要

在典型的沿海桥梁结构中,由于海底地形和深度的差异,多根钢筋混凝土桥柱沿高程具有不同的大气区、溅潮区和淹没区分布。因此,多个桥柱之间的腐蚀损伤是不同的。这种现象对桥梁的地震易损性有影响,但研究较少。桥梁地震易损性研究的两个主要新颖之处是:首先,考虑沿桥柱高度变化的腐蚀恶化率。其次,考虑了桥梁多柱腐蚀损伤的差异性。本文进行了三个连续部分的研究,以弥补研究空白。(1)根据腐蚀损伤特征,将某桥的桥柱分为三种类型。对不同类型柱进行了全寿命周期可能的地震破坏模式分析。(2)三种类型海岸桥梁柱的腐蚀过程分为两个阶段。研究了钢筋的初始腐蚀时间和随时间变化的力学性能。(3)通过实例分析了多桥柱不同腐蚀损伤的沿海桥梁的地震易损性。研究结果表明,对于一座滨海桥梁的多桥柱,由于腐蚀位置的不同,其随时间变化的地震破坏模式也不同。在评估桥梁使用寿命中的地震易损性时,应考虑这些差异。本文提供了解决这一复杂问题的方法,并通过一个案例来说明该方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seismic fragility analysis of coastal bridges considering different corrosion damage modes among multiple RC bridge columns
In a typical coastal bridge structure, the multiple reinforced concrete (RC) bridge columns possess different distributions of the atmospheric, splash-tidal, and submerged zone along the elevation, owing to the seabed topography and depth difference. Thereby, the corrosion damages are different among the multiple bridge columns. This phenomenon affects the bridge seismic fragility but has seldom been studied. Two main novelty of this study on the bridge seismic fragility are as follows. First, the variable corrosion deterioration rate along the height of one bridge column is considered. Second, the differences of the corrosion damages among multiple bridge columns are considered. Three sequential parts of research were conducted in this paper to bridge the research gap. (1) The bridge columns in one bridge were categorized into three types according to the corrosion damage characteristics. For each type of column, the life-cycle possible seismic failure modes were analyzed. (2) The corrosion processes of the coastal bridge columns in the three types were divided into two stages. The initial corrosion time and the time-dependent mechanical properties of the reinforcement were studied. (3) The seismic fragility of coastal bridges incorporating multiple bridge columns with different corrosion damages was analyzed by a case study. Research results indicate that for the multiple bridge columns in one coastal bridge, the time-dependent seismic failure modes are different due to different corrosion positions. Such differences should be considered when estimating the bridge’s seismic fragility in the service life. This paper provides the method to this complicated problem and also a case study to illustrate the method.
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来源期刊
CiteScore
7.60
自引率
19.40%
发文量
842
审稿时长
63 days
期刊介绍: Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.
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