Subassemblage Cyclic Loading Tests of Buckling-Restrained Braced RC Frames with Unconstrained Gusset Connections
Publication: Journal of Structural Engineering
Volume 142, Issue 2
Abstract
An unconstrained gusset connection for buckling restrained braces in reinforced concrete frame structures is proposed and tested as an effort to mitigate the complicated and usually harmful interactions between the steel gusset plate and the adjoining reinforced concrete column. Local damage control incorporating the rearrangement of beam flexural strength is also proposed to enhance the reliability of the gusset connection by moving the potential plastic hinge of the beam away from the connection region. Two different connecting methods, one with posttensioned steel rods and the other embedded stud groups, were considered. The results of the cyclic loading tests on reinforced concrete (RC) beam-gusset connection subassemblies confirmed that both connecting methods are available as long as the local damage control is implemented, which is not only helpful in eliminating the unfavorable deformation loss at the connection, but more importantly, can prevent the buckling restrained braces (BRBs) from being dislocated as a result of the beam end failure in extreme earthquake events.
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Acknowledgments
This research was funded by the National Natural Science Foundation of China for Young Scholars (No. 51308514), the International Science & Technology Cooperation Program of China (No. 2014DFA70950) and a collaborative research project provided by Structural Engineering Research Center at Tokyo Tech (No. 219). The financial support is gratefully appreciated. The authors are also grateful to Mr. Toshio Maegawa and Mr. Makoto Hamada of Kumagai Gumi Co., Ltd. for their help in preparing and conducting the tests.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 2 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: May 13, 2014
Accepted: Jul 22, 2015
Published online: Sep 10, 2015
Published in print: Feb 1, 2016
Discussion open until: Feb 10, 2016
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