Experimental Study on the Fatigue Endurance of the CFRP-Concrete Interface
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Volume 19, Issue 4
Abstract
The primary objectives of this paper were to experimentally investigate the fatigue endurance of the bond between carbon fiber-reinforced polymer (CFRP) sheets and concrete, and to propose a valid method for determining the safe range of loading when the CFRP-concrete interface is subjected to fatigue loading. The major test variables consisted of loading amplitude, concrete strength, CFRP-to-concrete width ratio, and bond length. The failure characteristics, evolution of the strain distribution along the bond length, CFRP-concrete interface debonding during fatigue tests, and fatigue lives were analyzed. The test results indicate that the fatigue life of the CFRP-concrete interface decreased with an increase in either loading amplitude or CFRP-to-concrete width ratio, but increased with an increase in either concrete strength or bond length. A fatigue life prediction model that considered four variables [(1) CFRP sheet stress amplitude, (2) mean value of cyclic stress in the CFRP sheet, (3) concrete strength, and (4) CFRP-to-concrete width ratio] was developed. The experimental results validate the proposed model and provide important guidance for the fatigue design of CFRP-strengthened flexural concrete members.
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Acknowledgments
The research reported in this paper was financially supported by a grant from the Major State Basic Research Development Program of China (973 Program, No. 2012CB026200).
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Published In
Journal of Composites for Construction
Volume 19 • Issue 4 • August 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 11, 2014
Accepted: Oct 16, 2014
Published online: Nov 17, 2014
Discussion open until: Apr 17, 2015
Published in print: Aug 1, 2015
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