Characterization of Mechanically Enhanced FRP Bonding System
Publication: Journal of Composites for Construction
Volume 17, Issue 1
Abstract
Despite extensive research on externally bonded fiber-reinforced polymer (EB-FRP) for rehabilitation of concrete structures in the past two decades, the industry has been slow to embrace the technology owing to some difficult problems that are yet to be resolved fully. Among these, premature debonding is one of the critical problems. Since the tensile strength of concrete is inherently low and unreliable (in the long term), EB-FRP by surface adhesion might not be the final solution; augmentation of the interfacial bond by mechanical fastening may be unavoidable. To this end, the first author proposed a bond augmentation system, hybrid-bonded FRP (HB-FRP), where a special type of mechanical fasteners are used to enhance the interfacial bond. Although the HB-FRP system has been experimentally shown to increase bond strength several fold, effectively overcoming the debonding problem, there has been no systematic theoretical study of the system. In this paper, HB-FRP joints are characterized through experimental testing and analytical modeling, leading to a theory for design and construction of the HB-FRP system.
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Acknowledgments
The work described in this paper was fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. CityU 123711).
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Published In
Journal of Composites for Construction
Volume 17 • Issue 1 • February 2013
Pages: 34 - 49
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Nov 14, 2011
Accepted: Jul 23, 2012
Published online: Jan 15, 2013
Published in print: Feb 1, 2013
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