Bond-Slip Model for FRP Laminates Externally Bonded to Concrete at Elevated Temperature
Publication: Journal of Composites for Construction
Volume 17, Issue 2
Abstract
This paper presents a nonlinear local bond-slip model for fiber reinforced polymer (FRP) laminates externally bonded to concrete at elevated temperature for future use in the theoretical modeling of fire resistance of FRP-strengthened concrete structures. The model is an extension of an existing two-parameter bond-slip model for FRP-to-concrete interfaces at ambient temperature. The two key parameters employed in the proposed bond-slip model, the interfacial fracture energy, , and the interfacial brittleness index, , were determined using existing shear test data of FRP-to-concrete bonded joints at elevated temperature. In the interpretation of test data, the influences of temperature-induced thermal stress and temperature-induced bond degradation are properly accounted for. As may be expected, the interfacial fracture energy, , is found to be almost constant initially and then starts to decrease when the temperature approaches the glass transition temperature of the bonding adhesive; the interfacial brittleness index, , exhibits a similar trend. The proposed temperature-dependent bond-slip model is shown to closely represent the test data upon which it is based, despite the large scatter of the test data.
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Acknowledgments
The authors are grateful for the financial support received from the Research Grants Council of the Hong Kong SAR (Project No: PolyU 516509) and for a Ph.D. studentship awarded to the second author by The Hong Kong Polytechnic University.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 17 • Issue 2 • April 2013
Pages: 217 - 228
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 24, 2012
Accepted: Sep 26, 2012
Published online: Sep 28, 2012
Published in print: Apr 1, 2013
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