Intensity measure-based probabilistic seismic evaluationand vulnerability assessment of ageing bridges

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL
M. Yazdani, V. Jahangiri
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引用次数: 4

Abstract

The purpose of this study is to first evaluate the seismic behavior of ageing arch bridges by using the Intensity Measure - based demand and DCFD format, which is referred to as the fragility-hazard format. Then, an investigation is performed for their seismic vulnerability. Analytical models are created for bridges concerning different features and these models are subjected to Incremental Dynamic Analysis (IDA) analysis using a set of 22 earthquake records. The hazard curve and results of IDA analysis are employed to evaluate the return period of exceeding the limit states in the IM-based probabilistic performance-based context. Subsequently, the fragility-hazard format is used to assess factored demand, factored capacity, and the ratio of the factored demand to the factored capacity of the models with respect to different performance objectives. Finally, the vulnerability curves are obtained for the investigated bridges in terms of the loss ratio. The results revealed that decreasing the span length of the unreinforced arch bridges leads to the increase in the return period of exceeding various limit states and factored capacity and decrease in the displacement demand, the probability of failure, the factored demand, as well as the factored demand to factored capacity ratios, loss ratio, and seismic vulnerability. Finally, it is derived that the probability of the need for rehabilitation increases by an increase in the span length of the models.
基于烈度测量的老化桥梁概率地震评价与易损性评价
本研究的目的是首先利用基于强度测量的需求和DCFD格式,即脆弱性-危害格式,对老化拱桥的抗震性能进行评估。然后对其地震易损性进行了研究。针对不同特征的桥梁建立了分析模型,并使用一组22次地震记录对这些模型进行增量动力分析(IDA)分析。利用风险曲线和IDA分析结果对基于im的概率性能环境下的超限状态回归期进行了评价。随后,脆弱性-风险格式被用于评估与不同性能目标相关的模型的因素需求、因素能力和因素需求与因素能力的比率。最后,给出了基于损失率的桥梁易损性曲线。结果表明:减小无加固拱桥跨径,导致其超过各种极限状态和因子容量的回归期增加,位移需求、破坏概率、因子需求、因子需求与因子容量比、损失率和地震易损性降低;最后,我们推导出需要修复的概率随着模型跨度长度的增加而增加。
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
Earthquakes and Structures
Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
2.90
自引率
20.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response
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