Incremental Dynamic Analysis of Mid-Rise Buildings with Buckling Restrained Brace Frame System under Pulse-Like Near-Fault Ground Motions

Articles in Press

Document Type : Regular Paper

Authors

1 Department of Civil Engineering, Technical and Vocational University (TVU), Tehran, Iran

2 Department of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran

3 Department of Civil and Environmental Engineering, Shiraz University, Shiraz, Iran

Abstract

Buckling Restrained Braced Frames (BRBFs) are frequently utilized as seismic force-resisting systems due to their considerable ductility and energy dissipation capacity. While BRBFs have shown reliable seismic performance in extensive experimental and numerical studies under far-field ground motions, research on their performance under near-fault ground motions is limited. near-fault ground motions, characterized by short-duration pulses with high amplitudes, impose greater seismic demands on structures. This study conducts Incremental Dynamic Analysis (IDA) on two 8- and 12-story BRBF structures under far-fault and near-fault ground motions. Comparison involves confidence intervals of average IDA curves rather than direct curve comparisons due to record selection uncertainty. At 99% confidence, no significant differences are observed. At 95% confidence, a minor difference is noted, while at 90%, substantial differences emerge, with confidence intervals indicating about a 25% difference for the 8-story and 75% for the 12-story structure. Residual drift comparisons show no significant difference at 99% confidence, a slight difference for the 12-story structure at 95%, and significant differences for both structures at 90% confidence. This suggests the importance of considering near-fault ground motions in assessing BRBF seismic performance, particularly for taller structures.

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Journal of Rehabilitation in Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 14 January 2025

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History

  • Receive Date: 10 May 2024
  • Revise Date: 24 December 2024
  • Accept Date: 14 January 2025

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