Retrofitting of Bridge Columns Using UHPC
Publication: Journal of Bridge Engineering
Volume 24, Issue 12
Abstract
The National Bridge Inventory reports indicate that a noticeable portion of the United States bridge infrastructure is drastically approaching the end of its intended design life, mainly due to environmental effects such as corrosion. This necessitates developing new techniques and materials for the rehabilitation of these deficient structures in a timely manner. To address this issue, a repair method has been developed at Florida International University (FIU) using ultrahigh-performance concrete (UHPC). This paper investigates the performance of the proposed retrofit method through experimental studies. A total of 11 1/4-scale columns with equal height-to-diameter ratios (H/D = 5) were cast and intentionally damaged to simulate a deficient column. Three columns with different transverse reinforcement ratios were considered as the baseline, seven of the columns were repaired using UHPC, and one was repaired with normal strength concrete (NSC) to compare. The retrofitted columns were subjected to combined constant vertical axial and cyclic lateral loads. The obtained experimental results revealed that the UHPC shell increased the strength of the damaged elements without increasing their size.
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Acknowledgments
The research study, results of which are reported in this paper, was sponsored by the Accelerated Bridge Construction University Transportation Center (ABC-UTC) at Florida International University with the Iowa State University and the University of Nevada–Reno as partners. ABC-UTC is a Tier 1 UTC funded by US DOT. The authors would like to acknowledge and thank the sponsors for their support. Opinions and conclusions expressed in this paper are those of the authors and do not necessarily represent those of the sponsors. The authors are also thankful to Lafarge for providing the Ductal (UHPC) material.
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 12 • December 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Jan 14, 2019
Accepted: Jun 24, 2019
Published online: Oct 4, 2019
Published in print: Dec 1, 2019
Discussion open until: Mar 4, 2020
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