Asynchronous Shake-Table Testing of Seismic Resilient Multispan Bridges Having Buckling Restrained Braces in Bidirectional Ductile Diaphragm
Publication: Journal of Structural Engineering
Volume 150, Issue 7
Abstract
The bidirectional ductile end diaphragm concept uses energy-dissipating buckling restrained braces (BRB) as fuses located at the end of a bridge superstructure’s floating spans. This system using BRBs can provide seismic resilient and damage-free bridges fully operational immediately after an earthquake. A shake-table testing program was conducted to subject a 1/2.5-scale specimen to series of ground motions. The specimen tested represents one span of a five-span bridge having BRBs connected to the abutment and the pier next to it. The purpose of these tests was to experimentally validate proposed connection details when subjected to the three-dimensional (3D) displacement histories (compared with the axis of the BRBs) that resulted from bidirectional ground motions and the fact that the connections must accommodate inclined BRB layouts. The test protocol included earthquake displacement histories that represent design demands, cycles of thermal excitations, and (to eventually make the BRBs fail) extreme motions. The testing program validated the effectiveness of the proposed concept and the ability of BRBs to sustain multiple ground motions before failure.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study was sponsored by the Transportation Research Board of the National Academies under the TRB-IDEA Program (NCHRP-215). The Fulbright program, SENESCYT Ecuador, and the University of Buffalo, are also acknowledged for their financial support through a scholarship to Dr. Homero Carrion Cabrera. This research was also made possible thanks to the significant donations of material and in-kind donations from the American Institute of Steel Construction, the High Industries Inc. companies (High Steel, High Concrete, and High Transit), CoreBrace LLC, and RJ Watson Inc. However, any opinions, findings, conclusions, and recommendations presented are those of the authors and do not necessarily reflect the views of the sponsors.
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Published In
Journal of Structural Engineering
Volume 150 • Issue 7 • July 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jun 1, 2023
Accepted: Jan 2, 2024
Published online: Apr 22, 2024
Published in print: Jul 1, 2024
Discussion open until: Sep 22, 2024
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