Abstract
An active aftershock sequence, triggered by a large mainshock, can cause major destruction to urban cities. It is important to quantify the aftershock effects in terms of nonlinear responses of realistic structural models. For this purpose, this study investigates the aftershock effects on seismic fragility of conventional wood-frame houses in south-western British Columbia, Canada, using an extensive set of real mainshock-aftershock earthquake records. For inelastic seismic demand estimation, cloud analysis and incremental dynamic analysis are considered. A series of nonlinear dynamic analyses are carried out by considering different seismic input cases and different analysis approaches. The analysis results indicate that consideration of aftershocks leads to 5–20 % increase of the median inelastic seismic demand curves when a moderate degree of structural response is induced. The findings of this investigation facilitate the extension of the existing approaches for inelastic seismic demand estimation to incorporate the aftershock effects.
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Acknowledgments
The authors thank an anonymous reviewer for providing insightful and constructive comments on the original manuscript, which led to significant improvement of the manuscript. The financial support provided through the Philip Leverhulme Prize is gratefully acknowledged. Strong ground-motion data were obtained from the PEER-NGA database (http://peer.berkeley.edu/nga/), the K-NET at www.k-net.bosai.go.jp, and the KiK-net at www.kik.bosai.go.jp.
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Goda, K., Salami, M.R. Inelastic seismic demand estimation of wood-frame houses subjected to mainshock-aftershock sequences. Bull Earthquake Eng 12, 855–874 (2014). https://doi.org/10.1007/s10518-013-9534-4
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DOI: https://doi.org/10.1007/s10518-013-9534-4