Seismic Response of a Damage-Resistant Recentering Posttensioned-HYFRC Bridge Column
Publication: Journal of Bridge Engineering
Volume 20, Issue 7
Abstract
This paper presents the shake-table tests of a damage-resistant posttensioned bridge column designed to rock at the interface with its foundation. It compares the response to that of a conventional bridge column detailed to conform with current California seismic design criteria. The lower portion of the rocking column was built using hybrid fiber-reinforced concrete (HYFRC) and was armored with headed rebars; these features enhanced the compression damage resistance at the column base. Unbonded rebars that crossed the rocking plane provided hysteretic energy dissipation. Both columns were subjected to a sequence of scaled historical triaxial earthquake ground motions including near-fault pulse-like motions. The conventional column formed a flexural plastic hinge with extensive spalling. It accumulated a 6.8% residual drift ratio after a sequence of seven ground motions, which caused a peak drift ratio of 10.8%. The posttensioned-HYFRC column sustained only light damage and accumulated only a 0.4% residual drift ratio after the same seven ground motions, which caused a peak drift ratio of 8.0%.
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Acknowledgments
This project was funded by PEER. The authors acknowledge Bekaert, Headed Reinforcement Corporation, and Dywidag Systems International for their generous donations of materials and equipment for these tests. The authors especially thank the engineers and staff at the PEER Earthquake Simulator Laboratory—in particular, Wesley Neighbour, Clemente Barthe, Nate Knight, Russell Middleton, and David MacLam—for their advice and assistance during specimen construction and testing as well as Dr. Vesna Terzic for technical assistance. Additional thanks go to graduate researchers Rotana Hay and Yosuke Ishihara for their assistance in test setup and execution.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 20 • Issue 7 • July 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Feb 11, 2014
Accepted: Aug 15, 2014
Published online: Sep 16, 2014
Published in print: Jul 1, 2015
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