CFRP Repair of Steel Beams with Various Initial Crack Configurations
Publication: Journal of Composites for Construction
Volume 15, Issue 6
Abstract
This paper presents an experimental program to study the behavior of notched steel beams repaired with carbon-fiber-reinforced polymer (CFRP) sheets. Particular attention is paid to examining the interaction between the level of initial damage (i.e., notch depth) and CFRP repair. Multiple stages of fatigue-crack-propagation in a steel beam are simulated by various notch sizes, including , 0.3, and 0.5 in which = notch depth; and = beam height. A modeling approach is proposed to simultaneously take into account crack-propagation across the steel section and debonding of the CFRP. Efficacy of the CFRP repair is more pronounced when the damage level increases. CFRP sheet stabilizes the crack mouth opening displacement of the repaired beams until significant debonding takes place. The level of initial damage affects the behavior of a plastic region above the notch tip, the rate of web fracture, and the initiation of CFRP debonding. The damage, however, does not influence the failure mode of the repaired beams. A crack-path independent fracture mechanics method is used to evaluate the energy release rate of the repaired beams.
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Acknowledgments
The writers gratefully acknowledge financial support from North Dakota State University.
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Published In
Journal of Composites for Construction
Volume 15 • Issue 6 • December 2011
Pages: 952 - 962
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Dec 23, 2010
Accepted: Apr 12, 2011
Published online: Apr 14, 2011
Published in print: Dec 1, 2011
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