Seismic fragility analysis of low-ductile RC frame accounting for the influence of mainshock-aftershock sequences

doi:10.6052/j.issn.1000-4750.2019.01.0116

	Seismic fragility analysis of low-ductile RC frame accounting for the influence of mainshock-aftershock sequences
	Han, Jian-Ping 1,2; Li, Jun 1,2
刊名	Gongcheng Lixue/Engineering Mechanics
	2020-02-01
卷号	37 期号:2 页码:124-133
关键词	Analytical models Computer simulation Concrete construction Numerical models Probability Reinforced concrete Stiffness Aftershock sequence Analysis and evaluation Longitudinal reinforcement Real mainshock-aftershock sequences Reinforced concrete frames Seismic fragility analysis Seismic fragility curves Seismic performance evaluation
ISSN号	10004750
DOI	10.6052/j.issn.1000-4750.2019.01.0116
英文摘要	Under the action of mainshock-aftershock sequences, the aftershock can cause additional damage to a damaged structure by the mainshock, or even cause it to collapse, especially for a low ductility structure. Currently, the analysis and evaluation of aseismic performance of low-ductile structures under the mainshock-aftershock sequences are not sufficient. According to the failure characteristics of a low-ductile reinforced concrete (RC) frame, the shear failure of beam-column joints, the flexure-shear failure of column, the strength and stiffness degradation, and the bond-slip failure of longitudinal reinforcement at the end of beam were taken into consideration for the numerical simulation of a low-ductile RC frame. The refined analytical model of a 6-story 3-span low-ductile RC frame structure was established via OpenSees finite element software. The real mainshock-aftershock sequences and the mainshock-aftershock sequences based on repeated method were selected. The effects of aftershock directionality and the number of aftershocks were also considered. Taking different mainshock-aftershock sequences as input, the dynamic analysis of the low-ductile RC frame model was carried out and the seismic fragility curves corresponding to different damage states were obtained. Then the effect of different mainshock-aftershock sequences on its aseismic performance was analyzed. The results show that the refined analytical model of a low-ductile RC frame presented can simulate the degradation of stiffness and strength of beam-column joints due to shearing actions. Comparing with the mainshock input only, the exceedance probability of the damage state of the low-ductile RC frame under the influence of the mainshock-aftershock sequences is higher, and with the increase of the damage extent under the mainshock, the increase is much more obvious. The exceedance probability of the corresponding damage state under the influence of the mainshock-aftershock sequences based on the repeated method is higher than that under the influence of the real mainshock-aftershock sequences. The different direction of aftershock has certain influence on the exceedance probability of corresponding damage states. Increasing the number of aftershocks will also increase the exceedance probability of corresponding damage states. © 2020, Engineering Mechanics Press. All right reserved.
语种	中文
出版者	Tsinghua University
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150674]
专题	教务处（创新创业学院）理学院
作者单位	1.Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou; 730050, China 2.Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Han, Jian-Ping,Li, Jun. Seismic fragility analysis of low-ductile RC frame accounting for the influence of mainshock-aftershock sequences[J]. Gongcheng Lixue/Engineering Mechanics,2020,37(2):124-133.
APA	Han, Jian-Ping,&Li, Jun.(2020).Seismic fragility analysis of low-ductile RC frame accounting for the influence of mainshock-aftershock sequences.Gongcheng Lixue/Engineering Mechanics,37(2),124-133.
MLA	Han, Jian-Ping,et al."Seismic fragility analysis of low-ductile RC frame accounting for the influence of mainshock-aftershock sequences".Gongcheng Lixue/Engineering Mechanics 37.2(2020):124-133.