Fatigue Behavior of Reinforced Concrete Beams Strengthened with Externally Bonded Prestressed CFRP Sheets
Publication: Journal of Composites for Construction
Volume 21, Issue 3
Abstract
An experimental study was conducted to investigate the fatigue behavior of RC beams strengthened with posttensioned prestressed carbon fiber-reinforced polymer (CFRP) sheets. The experimental program consisted of nine rectangular-section simply supported RC beams: four beams were statically tested to failure to determine the values of the fatigue loads to apply, and the remaining five beams were tested under fatigue load. The main purpose of the fatigue tests was to gain a better understanding of the fatigue performance and failure modes of RC beams strengthened with posttensioned prestressed CFRP sheets. The experimental results indicated that the fatigue failure mode of the prestressed CFRP sheet-strengthened RC beams was the tensile steel reinforcement rupture at the main cracked section. Moreover, the fatigue performance of the prestressed CFRP sheet-strengthened RC beams was significantly better than that of both unstrengthened and nonprestressed CFRP sheet-strengthened beams. Finally, a fatigue life prediction model that considers the gradual deterioration of performance of the component materials and partial debonding of the FRP was presented and applied to predict the fatigue life of 28 tested beams with two extreme FRP-to-concrete interfacial states. The results showed that the predicted fatigue life was close to the experimentally measured fatigue life for the fully bonded state. Thus, the effectiveness of the proposed model was verified, and the effect of fatigue load-induced FRP debonding along the beam substrate on fatigue life prediction was found to be insignificant.
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Acknowledgments
The authors would like to thank the National Natural Science Foundation of China (Program Nos. 51578135 and 51278441) and the Major State Basic Research Development Program of China (973 Program) (No. 2012CB026201) for providing funds for this research work. In addition, the authors wish to thank the University of Pittsburgh and Durham University for the research collaboration opportunity.
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Published In
Journal of Composites for Construction
Volume 21 • Issue 3 • June 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Apr 12, 2016
Accepted: Sep 8, 2016
Published online: Nov 8, 2016
Discussion open until: Apr 8, 2017
Published in print: Jun 1, 2017
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