Flexural and Interfacial Behavior of FRP-Strengthened Reinforced Concrete Beams
Publication: Journal of Composites for Construction
Volume 11, Issue 6
Abstract
Although there is a large amount of experimental data available on the fiber-reinforced polymer (FRP) strengthening of concrete structures, a full understanding of the various debonding phenomena is somewhat lacking. As a contribution to fill this need, two-dimensional and three-dimensional (3D) nonlinear displacement-controlled finite-element (FE) models are developed to investigate the flexural and FRP/concrete interfacial responses of FRP-strengthened reinforced concrete beams. Interface elements are used to simulate the FRP/concrete interfacial behavior before and after cracking. The analysis is carried out using two different relations for the interface; namely, nonlinear and bilinear bond–slip laws. The results predicted using these two laws are compared to those based on the full-bond assumption. The FE models are capable of simulating the various failure modes, including debonding of the FRP, either at the plate end or at intermediate cracks. The 3D model is created to accommodate cases of FRP-strengthened reinforced concrete beams utilizing FRP anchorage systems. In addition, the models successfully represent the actual interfacial behavior at the vicinities of cracks including the stress/slip concentrations and fluctuations. Results are presented in terms of the ultimate load carrying capacities, failure modes and deformational characteristics. Special emphasis is placed on the FRP/concrete interfacial behavior and cracking of the concrete. The numerical results are compared to available experimental data for 25 specimens categorized in six series, and they show a very good agreement.
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Acknowledgments
This research was funded by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canadian Network of Centres of Excellence on Intelligent Sensing for Innovative Structures (ISIS Canada). The third writer is a Canada Research Chair in Advanced Engineered Material Systems and the support of this program is gratefully acknowledged.NRC
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Information
Published In
Journal of Composites for Construction
Volume 11 • Issue 6 • December 2007
Pages: 629 - 639
Copyright
© 2007 ASCE.
History
Received: Mar 31, 2006
Accepted: Feb 27, 2007
Published online: Dec 1, 2007
Published in print: Dec 2007
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