Fatigue Performance of CFRP Strengthened RC Beams under Environmental Conditioning and Sustained Load
Publication: Journal of Composites for Construction
Volume 13, Issue 2
Abstract
Carbon fiber-reinforced polymers (CFRPs) have become increasingly important in recent years in bridge rehabilitation. Significant research has been done on the static behavior of CFRP-strengthened reinforced concrete (RC) structures; however, the fatigue behavior of such structures with interface defects subjected to harsh environmental conditions still needs to be investigated. Hence, an experimental program has been carried out to investigate the fatigue behavior, under a load range, which generates service load stress levels, of RC beams strengthened with CFRP fabrics. The effect of aggressive environments was studied by subjecting the test members to freeze–thaw, extreme temperature, ultraviolet light exposure, and relative humidity cycles. All beams survived 2 million fatigue cycles without showing significant bond degradation between composite and substrate. However, significant flexural stiffness degradation was observed in the conditioned specimens. The presence of defects also affected specimen stiffness; however, limited growth in defect size was observed due to fatigue cycling.
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Acknowledgments
This research work was funded by a grant received from the Federal Highway Administration (FHwA) and conducted at the Center for Infrastructure Engineering Studies (CIES) at Missouri University of Science and Technology (Missouri S&T). The writers express their gratitude and sincere appreciation for this support. They also acknowledge Nathan Marshall and Jared Brewe for their effort on this project as undergraduate research assistants.
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Published In
Journal of Composites for Construction
Volume 13 • Issue 2 • April 2009
Pages: 93 - 102
Copyright
© 2009 ASCE.
History
Received: Jun 15, 2007
Accepted: Sep 26, 2008
Published online: Apr 1, 2009
Published in print: Apr 2009
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