Out-of-Plane Stability of Buckling-Restrained Braces Placed in Chevron Arrangement
Publication: Journal of Structural Engineering
Volume 139, Issue 11
Abstract
Large-scale shake table tests were performed at E-Defense to examine the out-of-plane stability of buckling-restrained braces (BRBs). Two specimens were subjected repeatedly to a near-fault ground motion with increasing amplification. The test specimens comprised a single-bay, single-story steel frame and a pair of BRBs placed in a chevron arrangement. The specimens were not braced at the brace-to-beam intersection in order to produce a condition where the BRBs were susceptible to out-of-plane instability. Standard BRBs were used in the first specimen, while BRBs with a flexible segment at each end of the steel core were used in the second specimen. A simple stability model predicted the BRBs in the second specimen to fail because of out-of-plane buckling. The first specimen exhibited excellent ductility during the shake table tests, while the second specimen developed severe out-of-plane deformation that compromised the ductility of the BRBs. Based on the experimental observations and the stability model, a methodology is proposed to evaluate bracing requirements at the brace-to-beam intersection.
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Acknowledgments
The project presented in this paper was funded by the National Research Institute for Earth Science and Disaster Prevention (NIED) of Japan. Naomiki Suzuki and Makoto Ohsaki provided guidance to the overall project and specimen design. The authors thank Toru Takeuchi and Yuji Koetaka for sharing their views and latest research findings. Sachi Furukawa, Ryo Umehara, and Xuchuan Lin helped processing the data. The BRBs were provided by Nippon Steel Engineering Co., Ltd.; Maekawa Co., Ltd. managed specimen fabrication and construction of the test setup. Special thanks are extended to the administrative and technical staff of E-Defense, officially named the Hyogo Earthquake Engineering Research Center. The opinions expressed in this paper are those of the authors and do not necessarily reflect the views of the individuals and organizations mentioned above.
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Published In
Journal of Structural Engineering
Volume 139 • Issue 11 • November 2013
Pages: 1812 - 1822
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jun 13, 2012
Accepted: Oct 26, 2012
Published online: Oct 29, 2012
Published in print: Nov 1, 2013
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