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Structural Engineering and Mechanics Volume 72, Number 3, November10 2019 , pages 395-408 DOI: https://doi.org/10.12989/sem.2019.72.3.395 |
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Seismic response of RC frames under far-field mainshock and near-fault aftershock sequences |
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Seyed Amin Hosseini, Jorge Ruiz-García and Ali Massumi
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| 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. | ||
| Key Words | ||
| mainshock-aftershock sequences; inter-story drift ratio; residual inter-story drift ratio, damage index, period elongation, reinforced concrete frames | ||
| Address | ||
| Department of Civil Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran 2Department of Civil Engineering, Universidad Michoacana de San Nicolás de Hidalgo, Mexico City, Mexico | ||