Seismic Performance Evaluation of Long-Span Conventional Moment Frames and Buckling-Restrained Knee-Braced Truss Moment Frames
Publication: Journal of Structural Engineering
Volume 142, Issue 1
Abstract
Steel moment frame (MF) is one of the most prevalent and well researched steel seismic force resisting systems worldwide. However, efficiency and feasibility of using MF diminishes for large spans. In this paper, a recently developed steel seismic force resisting system, named buckling-restrained knee-braced truss moment frame (BRKBTMF), is suggested as a better alternative system. The BRKBTMF uses buckling-restrained knee-braces with open web trusses. In this paper, a four-story prototype office building was designed using both MF and BRKBTMF systems. Performance of the prototype building with different span lengths was systematically studied. The results show that BRKBTMF uses less structural steel, yet it performs better with lower structural damage, repair costs, and probability of collapse as compared with the MF for all span lengths and under all earthquake intensities considered. Hence, it is concluded that BRKBTMF is a viable and effective alternative seismic force resisting system for long-span applications.
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Acknowledgments
This work was funded in part by the Natural Sciences and Engineering Research Council of Canada (NSERC) jointly with the Steel Structures Education Foundation (SSEF). The authors would like to acknowledge David MacKinnon of the SSEF for making this project possible. The authors would also like to thank: Prof. S. Leelataviwat from King Mongkut’s University of Technology and Mr. John D. Hooper from MKA for their valuable advice during this study. Any opinions, findings and conclusion or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the Natural Sciences and Engineering Research Council of Canada or the Steel Structures Education Foundation.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 1 • January 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Sep 7, 2014
Accepted: Mar 26, 2015
Published online: Jun 11, 2015
Discussion open until: Nov 11, 2015
Published in print: Jan 1, 2016
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