Finite-Element Modeling of Intermediate Crack Debonding in FRP-Plated RC Beams
Publication: Journal of Composites for Construction
Volume 15, Issue 3
Abstract
Intermediate crack-induced debonding (IC debonding) is a common failure mode of RC beams strengthened with externally bonded fiber-reinforced polymer (FRP) reinforcement. Although extensive research has been carried out on IC debonding, much work is still needed to develop a better understanding of the failure mode and a more reliable strength model. This paper presents an advanced finite-element (FE) model on the basis of the smeared-crack approach for predicting IC debonding failure. Existing FE models of the same type are generally deficient in capturing localized cracks (both their pattern and widths). This deficiency is overcome in the proposed FE model through the accurate modeling of interfaces between the concrete and both the internal steel and the external FRP reinforcements. The capability and accuracy of the proposed model are demonstrated through comparisons of its predictions with selected test results. The importance of accurate modeling of localized cracking is also explained using numerical results obtained from the FE model.
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Acknowledgments
The writers are grateful for the financial support received from the Research Grants Council of the Hong Kong Special Administrative Region (Project No: UNSPECIFIEDPolyU 5173/04E) and the Hong Kong Polytechnic University. The writers are also grateful to Dr. Owen Rosenboom, who offered help during the early stage of the study through discussions with the first writer.
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Published In
Journal of Composites for Construction
Volume 15 • Issue 3 • June 2011
Pages: 339 - 353
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Feb 8, 2010
Accepted: Jul 14, 2010
Published online: Jul 17, 2010
Published in print: Jun 1, 2011
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