Seismic Strengthening of Bond-Critical Regions in Wall-Type Bridge Piers Using Active Confinement
Publication: Journal of Bridge Engineering
Volume 20, Issue 11
Abstract
Active confinement by means of pretensioned steel anchor rods is used for bond strengthening of lap-spliced reinforcement and for improving the seismic performance of wall-type bridge piers. Representative as-built and strengthened pier specimens with lap-spliced reinforcement within the critical hinging region were tested under large drift reversals. The test parameters included ratio of pier longitudinal reinforcement, diameter of the spliced bars, and configuration of the pretensioned steel rods. The strengthened piers developed enhanced bond resistance and low bond degradation of the spliced bars, increases in the lateral load and drift capacities, and much less pinching in the lateral load–drift response when compared with the as-built specimens. In this study, a design approach is developed for engineers to evaluate the active lateral pressure required for adequate bond strengthening and for designing the strengthening system. A design example is provided to illustrate the use of the proposed approach.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the Lebanese National Council for Scientific Research (LNCSR) under Grant No. 102622-21372. The authors are most grateful for that support and to the Faculty of Engineering and Architecture at the American University of Beirut (AUB) for providing the test facilities.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 20 • Issue 11 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 30, 2014
Accepted: Oct 21, 2014
Published online: Mar 3, 2015
Discussion open until: Aug 3, 2015
Published in print: Nov 1, 2015
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