Experimental Study on Dynamic Behavior of CFRP-to-Concrete Interface
Publication: Journal of Composites for Construction
Volume 20, Issue 5
Abstract
Carbon fiber–reinforced polymer (CFRP) sheets/plates are widely used to strengthen deficient RC structures. Existing studies show that the effectiveness of externally bonded CFRP materials generally depends on the bond between the CFRP element and concrete. Most of the research studies developed so far have focused on the bond behavior of the CFRP sheet-concrete interface under static loading. In this work, the bond behavior was experimentally investigated from the dynamic standpoint, through the drop-mass impact test method, with the aim of highlighting the effect of the loading rate on the bond strength. The test results show that the strain distribution gradient of the CFRP sheets under impact loading was larger than under static loading, and that the loading rate significantly influences the bond strength, while only moderately affecting the effective bond length. A practical bond-slip model is proposed to simulate the CFRP-to-concrete interface bond behavior under dynamic conditions, which considers the strain-rate effect based on the recommendations for the strength of concrete under impact loading. Furthermore, starting from the equations given in some existing guidelines, a design proposal is developed to accurately predict the effective bond length and the bond strength of the CFRP-to-concrete interface under impact loading.
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Acknowledgments
The research described in this paper was conducted at the CIPRES-2 Testing Laboratory, Ministry of Education Key Laboratory of Building Safety and Efficiency of the Hunan University, under the support of the 973 Program for National Key Basic Research Program of China (Project No. 2012CB026204) and the Program for New Century Excellent Talents in University (NCET-11-0123).
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Journal of Composites for Construction
Volume 20 • Issue 5 • October 2016
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© 2016 American Society of Civil Engineers.
History
Received: Jul 30, 2015
Accepted: Dec 8, 2015
Published online: Mar 3, 2016
Discussion open until: Aug 3, 2016
Published in print: Oct 1, 2016
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