Seismic behavior of RC bridges with various types of irregularities under chloride-induced corrosion

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-05-19 DOI:10.1016/j.istruc.2025.109218

Sepehr Nazari, Payam Tehrani

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引用次数: 0

Abstract

This research investigates the seismic behavior of 16 RC bridge models by accounting for the influence of chloride-related corrosion in their columns. The bridges include one regular and 15 irregular configurations, incorporating various types and combinations of irregularities. Structural irregularities, such as unequal column heights, unequal span lengths, and plan curvature, influence geometry and stiffness distribution, significantly impacting seismic behavior. Additionally, chloride accumulation over time leads to steel bar corrosion, degrading the mechanical properties of RC bridge columns. To assess these effects, all bridge configurations were subjected to corrosion levels of 0 %, 10 %, 20 %, and 30 %, and analyzed using inelastic time history analysis (ITHA) with 11 far-field earthquake records. The results show that corrosion increases column drift and maximum deck displacement, significantly impacting seismic safety. In particular, demand-to-capacity ratios increased by up to 80 % in certain irregular configurations, emphasizing the need for corrosion mitigation and seismic retrofitting in aging infrastructure. This study offers novel insights into the coupled effects of material degradation and structural irregularities, a critical but underexplored aspect of seismic bridge performance.

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氯化物腐蚀作用下各种异形RC桥的抗震性能

本文研究了16座钢筋混凝土桥梁模型的抗震性能，考虑了其柱中氯化物相关腐蚀的影响。这些桥梁包括1个规则结构和15个不规则结构，结合了各种类型和不规则结构的组合。结构不规则，如柱高不等、跨长不等和平面曲率不等，会影响几何形状和刚度分布，严重影响地震行为。此外，随着时间的推移，氯化物的积累会导致钢筋腐蚀，降低钢筋混凝土桥柱的力学性能。为了评估这些影响，所有桥梁结构都受到了0 %、10 %、20 %和30 %的腐蚀水平，并使用非弹性时程分析（ITHA）和11次远场地震记录进行了分析。结果表明，腐蚀增加了柱位移和最大甲板位移，显著影响抗震安全。特别是，在某些不规则配置中，需求容量比增加了80% %，这强调了对老化基础设施的腐蚀缓解和抗震改造的需求。这项研究为材料退化和结构不规则的耦合效应提供了新的见解，这是桥梁抗震性能的一个关键但未被充分探索的方面。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.