Fatigue Crack Propagation of Notched Steel Rebar in RC Beams Repaired with Externally Bonded CFRP
Publication: Journal of Composites for Construction
Volume 19, Issue 5
Abstract
This paper presents the results of an experimental study on the fatigue performance of RC beams strengthened with different externally bonded carbon fiber-reinforced polymer (CFRP) systems. Seven specimens were fabricated; three had no CFRP, while the remaining four had one of two CFRP systems. The objective of the research reported in this paper was to determine the effect the CFRP repair had on the growth rate of a fatigue crack initiating from a notch in the tensile rebars. The steel reinforcement was selected for focus because similar studies have found this reinforcement to be the limiting fatigue component in RC beams. The experimental results reported in this paper showed an extended fatigue life and a slowed crack growth rate in specimens repaired with both CFRP systems. The crack growth rates were used to determine material constants for the Paris law, which describes growth of a stable fatigue crack. These results are then used to propose recommendations for design of CFRP repair systems for a specific fatigue life.
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Acknowledgments
The writers would like to acknowledge the Mountain Plains Consortium for financial support of the research reported in this paper (MPC 410) and Fyfe Company, San Diego, California, for the gracious donation of all composite materials.
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Published In
Journal of Composites for Construction
Volume 19 • Issue 5 • October 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 23, 2014
Accepted: Oct 16, 2014
Published online: Nov 24, 2014
Discussion open until: Apr 24, 2015
Published in print: Oct 1, 2015
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