Experimental Investigation of Buckling Restrained Braces for Bridge Bidirectional Ductile End Diaphragms
Publication: Journal of Structural Engineering
Volume 144, Issue 6
Abstract
Quasi-static experiments were conducted to subject buckling restrained braces (BRBs) to a regime of relative end displacements demands to investigate if the BRBs’ end connections could be able to sustain the required displacement demands when installed in bidirectional ductile end diaphragm systems (EDS). The loading protocols included the bidirectional displacement histories to be applied to the specimens for the cyclic inelastic test and the uniaxial displacement histories for the low-cycle fatigue test caused by temperature changes. Two types of BRBs with flat end plates and unidirectional pinholes, namely BRB-1 and BRB-2, were designed and tested. Four specimens of each type of BRB were tested under combinations of different displacement protocols, and the resulting BRBs’ hysteretic behaviors were studied and compared. All the BRB specimens tested developed cumulative inelastic deformations of more than 200 times the BRB’s axial yield displacement. The specimens were able to sustain multiple years of severe temperature cycles in addition to meeting the seismic qualification test criterion. Ultimately, as expected, all BRBs failed in tension after extensive cycles of inelastic deformations. No undesirable end-plate failure or instability was observed. A recommended design procedure for the EDS with BRBs in both straight and skew bridges was developed based on these experimental results.
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Acknowledgments
This study was sponsored by the Transportation Research Board of the National Academies under the TRB-IDEA Program (NCHRP-172). The authors acknowledge the oversight, valuable comments, and feedback from the NCHRP IDEA Project Advisor Lian Duan (California Department of Transportation) and other members of the Project’s Expert Advisory Panel, namely Geoffrey Swett and Bijan Khalegi (Washington Department of Transportation), Taneja, Rajesh and Richard Marchione (New York Department of Transportation), Tom Ostrom (California Department of Transportation), and Phil Yen and Fred Faridazar (Federal Highway Administration). However, any opinions, findings, conclusions, and recommendations presented in this report are those of the authors and do not necessarily reflect the views of the sponsor.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jul 10, 2017
Accepted: Nov 16, 2017
Published online: Mar 27, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 27, 2018
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