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http://dx.doi.org/10.12989/sem.2019.72.3.395

Seismic response of RC frames under far-field mainshock and near-fault aftershock sequences  

Hosseini, Seyed Amin (Department of Civil Engineering, Faculty of Engineering, Kharazmi University)
Ruiz-Garcia, Jorge (Department of Civil Engineering, Universidad Michoacana de San Nicolas de Hidalgo)
Massumi, Ali (Department of Civil Engineering, Faculty of Engineering, Kharazmi University)
Publication Information
Structural Engineering and Mechanics / v.72, no.3, 2019 , pp. 395-408 More about this Journal
Abstract
Engineered structures built in seismic-prone areas are affected by aftershocks in addition to mainshocks. Although aftershocks generally are lower in magnitude than that of the mainshocks, some aftershocks may have higher intensities; thus, structures should be able to withstand the effect of strong aftershocks as well. This seismic scenario arises for far-field mainshock along with near-field aftershocks. In this study, four 2D reinforced concrete (RC) frames with different numbers of stories were designed in accordance with the current Iranian seismic design code. As a way to evaluate the seismic response of the case-study RC frames, the inter-story drift ratio (IDR) demand, the residual inter-story drift ratio (RIDR) demand, the Park-Ang damage index, and the period elongation ratio can be useful engineering demand parameters for evaluating their seismic performance under mainshock-aftershock sequences. The frame models were analyzed under a set of far-field mainshock, near-fault aftershocks seismic sequences using nonlinear dynamic time-history analysis to investigate the relationship among IDR, RIDR, Park-Ang damage index and period ratio experienced by the frames. The results indicate that the growth of IDR, RIDR, Park-Ang damage index, and period ratio in high-rise and short structures under near-fault aftershocks were significant. It is evident that engineers should consider the effects of near-fault aftershocks on damaged frames that experience far-field mainshocks as well.
Keywords
mainshock-aftershock sequences; inter-story drift ratio; residual inter-story drift ratio; damage index; period elongation; reinforced concrete frames;
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Times Cited By KSCI : 14  (Citation Analysis)
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