Experimental and Numerical Evaluation of Older Chevron Concentrically Braced Frames with Hollow and Concrete-Filled Braces
This article has been corrected.
VIEW CORRECTIONPublication: Journal of Structural Engineering
Volume 144, Issue 3
Abstract
Detailed seismic provisions for concentrically braced frames have evolved continuously since 1988. Thus, vintage-era braced frames, especially those designed prior to 1988, may be prone to a number of significant deficiencies. These deficiencies include interdependent failures at the braces, connections, and beams, making them difficult to predict without system-level tests. An experimental study was undertaken to evaluate current retrofit provisions’ ability to predict the seismic response of pre-1988 existing braced frames. A nearly full-scale test specimen—representative of a 1985 chevron braced frame—was subjected to cyclic lateral loading. The specimen was subsequently upgraded with concrete-filled braces and retested. Test results demonstrate that pre-1988 braced frames are highly susceptible to weak-story behavior and local failure modes. Numerical models using standard nonlinear static methods predicted some, but not all, of these failures. Accordingly, recommendations to improve the efficacy of these numerical models are presented.
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Acknowledgments
This research was supported by National Science Foundation (NSF) under Grant No. CMMI-1208002. The principal investigator was Charles Roeder of the University of Washington, Seattle. The work reported on herein was carried out as a subaward from this project under the supervision of the second author. Special thanks go to Dr. Jiun-Wei Lai and the many practicing engineers whose advice was invaluable to this research. The writers also wish to express their appreciation to the technical staff of the Berkeley site for the NSF George E. Brown, Jr., Network for Earthquake Engineering Simulation for its invaluable assistance. The findings, opinions, recommendations, and conclusions in this paper are those of the authors alone and do not necessarily reflect the views of others, including the sponsors.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 3 • March 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Feb 14, 2017
Accepted: Sep 14, 2017
Published online: Jan 10, 2018
Published in print: Mar 1, 2018
Discussion open until: Jun 10, 2018
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