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- W2600352605 abstract "Recent studies have addressed the computation of fragility curves for mainshock (MS)-damaged buildings. However, aftershock (AS) fragilities are generally conditioned on a range of potential post-MS damage states that are simulated via static or dynamic analyses performed on an intact building. Moreover, there are very few cases where the behavior of non-ductile reinforced concrete buildings is analyzed. This paper presents an evaluation of AS collapse fragility conditioned on various return periods of MSs, allowing for the rapid assessment of post-earthquake safety variations based solely on the intensity of the damaging earthquake event. A refined multi-degree-of-freedom model of a seven-storey non-ductile building, which includes brittle failure simulations and the evaluation of a system level collapse, is adopted. Aftershock fragilities are obtained by performing an incremental dynamic analysis for a number of MS–AS ground motion sequences and a variety of MS intensities. The AS fragilities show that the probability of collapse significantly increases for higher return periods for the MS. However, this result is mainly ascribable to collapses occurred during MSs. When collapse cases that occur during a MS are not considered in the assessment of AS collapse probability, a smaller shift in the fragility curves is observed as the MS intensity increases. This result is justified considering the type of model and collapse modes introduced, which strongly depend on the brittle behavior of columns failing in shear or due to axial loads. The analysis of damage that is due to MSs when varying the return period confirms this observation. Copyright © 2017 John Wiley & Sons, Ltd." @default.
- W2600352605 created "2017-04-07" @default.
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- W2600352605 date "2017-03-24" @default.
- W2600352605 modified "2023-09-23" @default.
- W2600352605 title "Aftershock collapse fragility curves for non-ductile RC buildings: a scenario-based assessment" @default.
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- W2600352605 doi "https://doi.org/10.1002/eqe.2894" @default.
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