Prestressed MF-FRP: Experimental Study of Rapid Retrofit Solution for Deteriorated Prestressed C-Channel Beams
Publication: Journal of Performance of Constructed Facilities
Volume 35, Issue 1
Abstract
This paper presents design and installation details and full-scale test results for a prestressed mechanically fastened fiber-reinforced polymer (MF-FRP) retrofit solution that restores the original operating and inventory rating of prestressed concrete C-channel bridge superstructures with prestress losses due to concrete deterioration and steel corrosion. A retrofit solution that can be installed rapidly and immediately restores prestress losses is desired to minimize impacts on commerce, public transportation, and emergency services. Six 9.41-m (30-ft) long C-channel beams were tested for three-point bending to failure. The results of the experimental study indicate that the MF-FRP retrofit is capable of immediately restoring deteriorated C-channel beams with a 36% reduction in capacity from the original operating and inventory ratings. In this study, the reduction in the capacity of the C-channel beams was induced in the lab by cutting the bottom strand of each stem of the C-channel beam to simulate total prestress losses at the point of maximum internal moment. Further, the results of the experimental study indicate that the examined MF-FRP retrofit solution can be installed in 4.1 labor hours per retrofitted C-channel beam. Therefore, a four-worker DOT maintenance crew can install the retrofit on up to seven beams in a single eight-hour workday. A layered sectional analysis can be used to predict the flexural capacity of retrofitted C-channel beams with very good accuracy.
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Data Availability Statement
All of the data and models that support the findings of this study are available from the corresponding author on request.
Acknowledgments
The authors thank the North Carolina DOT and the NSF I/UCRC Center for the Integration of Composites into Infrastructure (CICI) for funding the research. Additionally, the authors acknowledge Cleveland City Forge for providing the turnbuckles used in MF-FRP 1.0 and MF-FRP 2.0 system designs, and Mr. William Briley at the North Carolina DOT Division 5 Bridge Maintenance Division for providing the C-channel beams for testing.
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Published In
Journal of Performance of Constructed Facilities
Volume 35 • Issue 1 • February 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Feb 25, 2019
Accepted: Jul 17, 2020
Published online: Oct 23, 2020
Published in print: Feb 1, 2021
Discussion open until: Mar 23, 2021
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