Effect of Composite Gravity Framing on Seismic Response of Eccentrically Braced Frames

Abstract

This paper presents a numerical study investigating the effect of composite gravity frames (CGFs) on the seismic response of eccentrically braced frames (EBFs) subjected to a suite of earthquake ground motions. Two different modeling approaches were considered for each archetype with 4, 8, and 16 stories. While the first model included only the bare steel EBF, the second model considered the EBF together with tributary gravity frames (GFs) and included the effects of a composite floor slab both on the response of the gravity frame connections and on the response of EBF links. A total of 1056 nonlinear time-history analyses were performed using the Opensees software by subjecting the archetypes to 44 scaled and unscaled far-field ground motions defined in FEMA P695. Interstory drift ratios, residual drift ratios, link rotation angles and residual link rotation angles were considered as the response indicators. In addition, a process of removing damaged links was simulated to evaluate the amount of residual drift after this process. The analyses show that the CGFs have a significant beneficial effect on the performance of EBF in terms of link rotation angles and residual drift ratios. Further, the process of removing links for replacement may provide additional benefits in allowing further reductions in residual drift ratio obtained as less than 0.5% even under ground motions scaled to the maximum considered earthquake when the CGFs were included in the model.

Keywords

• Eccentrically braced frame
• gravity frame
• composite slab
• residual drift
• residual link rotation angles

Supporting Institution

TÜBİTAK

Project Number

TÜBİTAK 2219-1059B191700103

Thanks

The study was supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK) under the grant number TÜBİTAK 2219-1059B191700103. The authors thank to TÜBİTAK for their supports. The opinions expressed in this paper are those of the authors and do not reflect the views of the sponsor.

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