Performance of FRP-Strengthened Reinforced Concrete Bridge Girders after 12 Years of Service in Coastal Florida
Publication: Journal of Composites for Construction
Volume 25, Issue 4
Abstract
Although externally bonded fiber-reinforced polymer (FRP) composites are commonly employed to strengthen reinforced concrete members, the durability of these rehabilitation measures is not well understood. This work includes the examination of FRP-strengthened girders after 12 years of service exposed to brackish water, including assessments of remaining structural strength and investigations of the FRP. Structural load tests of the rehabilitated girders—compared to companion, unstrengthened girders—demonstrate that FRP strengthening maintains influence on the girder strength and failure mode at ultimate strength. The combination of glass fiber–reinforced polymer (GFRP) and carbon fiber–reinforced polymer (CFRP) reinforcement provided a modest improvement in bridge girder strength (12% beyond residual strength) while limiting ductility. Inspection of the FRP microstructure, mechanical property tests, and bond pull-off tests, however, suggest that the FRP’s contribution to structural strength may be greatly influenced by construction techniques and exposure conditions. Strength was calculated using the strain limits from relevant guidelines and was conservatively estimated for the design scenario herein evaluated.
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Acknowledgments
The authors gratefully acknowledge the financial support for this work provided, in part, by the Florida Department of Transportation (FDOT) research contract BDV31-977-01 with the University of Florida. In addition, the authors thank the staff at FDOT Marcus H. Ansley Structures Research Center in Tallahassee, Florida, and FDOT State Materials Office in Gainesville, Florida, for their assistance with testing and technical advice. The authors also thank Dr. Trey Hamilton, Professor Emeritus at the University of Florida, for his support in the development of this paper.
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Published In
Journal of Composites for Construction
Volume 25 • Issue 4 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 12, 2020
Accepted: Mar 11, 2021
Published online: May 12, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 12, 2021
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