Retrofitting Precast Bridge Beams with Carbon Fiber-Reinforced Polymer Strips for Shear Capacity
Publication: Journal of Performance of Constructed Facilities
Volume 23, Issue 4
Abstract
Advancements in fiber-reinforced polymers (FRPs) have made this an attractive material for rehabilitation and strengthening of bridge superstructures. FRP has primarily been used with the intention of increasing the bending strength of bridge members. However, this paper investigates the use of externally placed FRP strips to increase shear capacity of short-span, , precast concrete channel beam bridges. A statewide survey revealed that as many as 389 bridges in the state of Arkansas are comprised of these members. Notably, beams within these bridges were designed under provisions that did not require shear reinforcement. In this research, four sections were retrofitted using carbon fiber-reinforced polymer (CFRP) strips and load tested to failure to measure the repair effectiveness. The performance of the retrofitted sections far exceeded that of unretrofitted sections. It was concluded that the addition of the CFRP repair increased the deflection ductility at least 123%. In addition, beams retrofitted with the CFRP strips experienced at least 26% more deflection after the initiation of a shear crack; therefore reducing the risk of a catastrophic failure.
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Acknowledgments
The research presented herein was conducted with financial support by the Arkansas State Highway and Transportation Department. The contents of this paper reflect the views and opinions of the authors and not necessarily those of the Arkansas State Highway and Transportation Department. The writers would like to thank the following individuals for their assistance with this research: Mr. James “Scooter” Key of the Arkansas State Highway and Transportation Department and Mr. Mark Kuss and Mr. Keith Tencleve of the University of Arkansas.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 23 • Issue 4 • August 2009
Pages: 219 - 226
Copyright
© 2009 ASCE.
History
Received: Jul 24, 2008
Accepted: Dec 10, 2008
Published online: Jul 15, 2009
Published in print: Aug 2009
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