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Seismic fragility of lateral force resisting systems under near and far-fault ground motions

Seismic fragility of lateral force resisting systems under near and far-fault ground motions In this paper, the effect of near- and far-fault ground motions on the seismic performance of buckling restrained braced frames (BRBFs) and special moment resisting frames (SMRFs) are evaluated. Incremental dynamic analyses are employed to quantify the response parameters of the sample structures (two sets of three frames), and fragility curves are derived. Comparison of the results for near-fault records are made with ordinary records. The fragility curves are developed for life safety (LS) and collapse prevention (CP) performance levels. Based on the results, the average values of PGA corresponding to 10% probability of collapse are equal to 0.50 g and 0.42 g, for BRBF structures (CP limit state), for far and near-fault ground motions, respectively, These values are equal to 0.55 g and 0.45 g, for SMRF counterparts. It reveals that seismic performance of BRBF structures against near-fault records is similar to SMRF structures, or even better in some cases. Keywords: fragility curve; near-fault; buckling restrained frame; special moment resisting frame; SMRF. Reference to this paper should be made as follows: Soltangharaei, V., Razi, M. and Vahdani, R. (2016) ` under near and far-fault ground motions', Int. J. Structural Engineering, Vol. 7, No. 3, pp.291­303. Biographical notes: http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Structural Engineering Inderscience Publishers

Seismic fragility of lateral force resisting systems under near and far-fault ground motions

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Publisher
Inderscience Publishers
Copyright
Copyright © 2016 Inderscience Enterprises Ltd.
ISSN
1758-7328
eISSN
1758-7336
DOI
10.1504/IJSTRUCTE.2016.077722
Publisher site
See Article on Publisher Site

Abstract

In this paper, the effect of near- and far-fault ground motions on the seismic performance of buckling restrained braced frames (BRBFs) and special moment resisting frames (SMRFs) are evaluated. Incremental dynamic analyses are employed to quantify the response parameters of the sample structures (two sets of three frames), and fragility curves are derived. Comparison of the results for near-fault records are made with ordinary records. The fragility curves are developed for life safety (LS) and collapse prevention (CP) performance levels. Based on the results, the average values of PGA corresponding to 10% probability of collapse are equal to 0.50 g and 0.42 g, for BRBF structures (CP limit state), for far and near-fault ground motions, respectively, These values are equal to 0.55 g and 0.45 g, for SMRF counterparts. It reveals that seismic performance of BRBF structures against near-fault records is similar to SMRF structures, or even better in some cases. Keywords: fragility curve; near-fault; buckling restrained frame; special moment resisting frame; SMRF. Reference to this paper should be made as follows: Soltangharaei, V., Razi, M. and Vahdani, R. (2016) ` under near and far-fault ground motions', Int. J. Structural Engineering, Vol. 7, No. 3, pp.291­303. Biographical notes:

Journal

International Journal of Structural EngineeringInderscience Publishers

Published: Jan 1, 2016

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