Analytical Study of the Seismic Performance of Steel-Braced Frames with Masonry Infill
Publication: Journal of Structural Engineering
Volume 142, Issue 10
Abstract
Special concentrically braced frames (CBFs) are widely used as efficient lateral-load resisting systems in seismic regions. In this study, experimentally validated finite-element (FE) models are used to investigate the effects of masonry infill and gusset-plate configuration on the seismic performance of CBFs. It is shown that the presence of masonry infill can increase the initial stiffness and ultimate strength of CBFs by up to 35 and 52%, respectively. However, the frame-infill interaction imposes high plastic strain demands at the horizontal re-entrant corner of gusset plate connections, which may lead to premature failure of fillet welds under strong earthquakes. Whereas using tapered gusset plates can significantly increase the fracture potential at fillet welds, gusset plates with elliptical clearance of eight times the plate thickness can lead to up to 54% lower equivalent plastic strain demands at both gusset plate connections and brace elements. Although the effects of masonry infill are usually ignored in the seismic design process, the results highlight the importance of considering those effects in the seismic design of CBF elements and gusset plate connections.
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Acknowledgments
The authors would like to thank the Director of the Structural Research Centre and all technicians and technical staff at IIEES for their valuable assistance.
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Apr 9, 2015
Accepted: Feb 23, 2016
Published online: May 9, 2016
Published in print: Oct 1, 2016
Discussion open until: Oct 9, 2016
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