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Seismic performance of buckling-restrained braced frames with varying beam-column connections

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Abstract

The effect of beam-column connections and brace configurations on the overall seismic response of a medium-rise bucklingrestrained braced frame (BRBF) is analytically evaluated in the present study. Two types of brace configurations (chevron and Double-X) and a combination of the moment-resisting and the non-moment-resisting beam-column connections are considered. A total of five design cases are studied for a seven-story BRBF in which a constant value of response reduction (R) factor equal to 8 is considered in the design. Nonlinear dynamic analyses are carried out for all study frames for an ensemble of forty ground motions representing the DBE and MCE hazard levels. Fragility curves are developed for all study frames considering the interstory drift ratio and residual drift ratio as the damage parameters. Results showed that a higher value of response reduction factor should be adopted in the design of BRBFs for both pinned and rigid beam-column connections. Further, in order to achieve the desired seismic performance of BRBFs, Double-X brace configurations and rigid beam-column connections at the alternate story levels should be used.

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Authors and Affiliations

  1. Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India

    Ahmad Fayeq Ghowsi & Dipti Ranjan Sahoo

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  1. Ahmad Fayeq Ghowsi
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  2. Dipti Ranjan Sahoo
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Correspondence to Dipti Ranjan Sahoo.

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Note.-Discussion open until May 1, 2014. This manuscript for this paper was submitted for review and possible publication on February 21, 2013; approved on September 4, 2013.

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Ghowsi, A.F., Sahoo, D.R. Seismic performance of buckling-restrained braced frames with varying beam-column connections. Int J Steel Struct 13, 607–621 (2013). https://doi.org/10.1007/s13296-013-4003-0

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  • DOI: https://doi.org/10.1007/s13296-013-4003-0

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