Evaluation of Seismic fragility of infilled frames subject to mainshock/aftershock sequences

Document Type : Research Article

Authors

Department of Civil Engineering, University of Tabriz

Abstract

The purpose of this paper is to assess the seismic fragility and residual capacity of the reinforced concrete frame (RC) with masonry infills subject to mainshock/aftershock sequences in the far- and near-fields. In conventional incremental dynamic analysis (IDA), only the effect of the main shock is considered in the analysis, while the double incremental dynamic analysis (D-IDA) method which is used in this paper, considers the aftershock effects. Double incremental dynamic analysis approach is used, based on the combination of the mainshock(MS) at different intensities with a set of aftershocks (AS) scaled in amplitude with respect to peak ground. In this study, 20 near-field records and 20 far-field records were selected. In each analysis, a same record has been used for the main shock and after shock. The fragility curves of the intact and pre-damaged frames have been prepared for the records using fiber modeling in OpenSees software. Also, based on the results obtained from the incremental dynamic analysis, the frame residual capacity diagrams are defined and the infilled frame response is compared with the bare frame at different intensities of the main shock. According to the results obtained for infilled, the seismic fragility of the reinforced concrete frame is reduced due to the mainshock and aftershock. Also, the damages and losses economic of the structure under moderate earthquakes are reduced. According to the fragility curves, when only 100% collapse occurs in the bare frame, the probability of the frame collapsing with the infill wall at the same intensity as PGA (maximum ground acceleration) for near- and far-field earthquakes records is significantly reduced.

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References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 4
July 2022
Pages 1375-1398

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