Seismic fragility of structures with energy dissipation devices for mainshock-aftershock events

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL
M. Noureldin, M. Adane, Jinkook Kim
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引用次数: 2

Abstract

This paper presents a mainshock-aftershock seismic fragility and collapse capacity assessment of reinforced concrete (RC) structures retrofitted with a hybrid damper composed of a steel slit plate and friction pads. Three and eight-story RC buildings are designed and assessed before and after retrofit considering the aftershocks effect. Non-linear time-history response analysis (NLTHA) using twelve natural earthquake sequences are used to produce incremental dynamic analysis (IDA) curves to obtain the median collapse capacity of the structures. Three different damage state (DS) levels are used for the mainshock ground excitation to quantify the scale factors required for conducting the aftershock IDAs. The maximum inter-story drift ratio (MIDR) is used as the main engineering demand parameter. The study shows the importance of considering the aftershock in the seismic assessment process of RC structures. The un-retrofitted structures are found to experience a high level of deterioration under aftershock event which is not considered in the design stage. The findings of the study reveal that the mainshock-aftershock sequence responses of the retrofitted structures show better performance in terms of the median collapse capacity and the seismic fragility compared to the un-retrofitted ones.
具有消能装置的主震-余震结构的地震易损性
本文对钢筋混凝土(RC)结构进行了主-余震地震易损性和倒塌能力的评估。考虑余震影响,对三层和八层钢筋混凝土建筑进行了改造前后的设计和评估。采用12次自然地震序列的非线性时程响应分析(NLTHA),生成增量动力分析(IDA)曲线,得到结构的中位倒塌能力。采用三种不同的损伤状态(DS)水平作为主震地面激励,量化了进行余震IDAs所需的尺度因子。最大层间位移比(MIDR)作为主要的工程需求参数。研究表明,在钢筋混凝土结构抗震评估过程中考虑余震的重要性。未经改造的结构在设计阶段没有考虑到的余震事件下经历了高度的退化。研究结果表明,与未加固结构相比,加固结构的主余震序列反应在中位倒塌能力和地震易损性方面表现出更好的性能。
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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