Carbon Fiber Shear Retrofit of Forty-Two-Year-Old AASHTO -Shaped Girders
Publication: Journal of Composites for Construction
Volume 15, Issue 5
Abstract
Sixteen shear capacity tests were performed on eight decommissioned AASHTO prestressed concrete girders that had been in service for over 42 years. These bridge members presented a unique opportunity to investigate carbon fiber-reinforced polymer (CFRP) retrofit schemes to enhance the shear capacity of underreinforced girders that were nonrectangular. Four destructive tests were performed to quantify the in-service strength of the girders and the remaining 12 tests were performed on CFRP retrofitted girders. In all, five configurations of the CFRP reinforcement were evaluated. Two anchoring techniques were investigated that either involved epoxying a horizontal CFRP strip over the vertical strips or a new methodology of epoxying a CFRP laminate into a groove over the vertical strips that was cut at the web-to-flange interface. Two methodologies that predicted the shear contribution of the carbon fiber reinforcement were compared with the test results. A carbon fiber-reinforcing scheme of vertical strips and horizontal anchorage strip was found to be the most effective in resisting the applied shear.
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Acknowledgments
The authors wish to express their sincere gratitude to The Chemical Company (BASF) for donating the CFRP fabric as well as the Utah Department of Transportation for the funding.
References
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Information
Published In
Journal of Composites for Construction
Volume 15 • Issue 5 • October 2011
Pages: 773 - 781
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Aug 12, 2010
Accepted: Jan 24, 2011
Published online: Jan 26, 2011
Published in print: Oct 1, 2011
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