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

Authors: V. Soltangharaei; M. Razi; R. Vahdani

Addresses: Department of Civil Engineering, Semnan University, 3513119111, Semnan, Iran ' Department of Civil Engineering, Semnan University, 3513119111, Semnan, Iran ' Department of Civil Engineering, Semnan University, 3513119111, Semnan, Iran

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 curves; near-fault ground motions; buckling restrained braced frames; special moment resisting frames; SMRF; seismic fragility; lateral force resistance; far-fault ground motions; earthquakes; life safety performance; collapse prevention performance; seismic performance.

DOI: 10.1504/IJSTRUCTE.2016.077722

International Journal of Structural Engineering, 2016 Vol.7 No.3, pp.291 - 303

Received: 16 Jul 2015
Accepted: 27 Oct 2015
Published online: 13 Jul 2016 *

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