Numerical Modeling of Concrete-FRP Debonding Using a Crack Band Approach
Publication: Journal of Composites for Construction
Volume 14, Issue 1
Abstract
In this study, numerical procedures are proposed to predict the structural behavior of concrete members strengthened with fiber-reinforced polymeric (FRP) sheets or plates. The concept of damage band or crack band is introduced and used for predicting the debonding failure of the concrete-epoxy interface formed when FRP sheets or plates are externally bonded to a concrete substrate. In the crack band approach, all the processes taking place during the failure of a concrete-epoxy interface are smeared in a band of fixed width. This makes the approach attractive from a modeling point of view since continuum theories, along with softening relations, can be used to model the damage which causes debonding of the interface. In order to validate this approach, numerical predictions, using the concept of crack band, are compared against experimental results obtained from tests of concrete blocks and reinforced concrete beams strengthened with FRP. In particular, the capability of the proposed numerical approach to predict the load-displacement response, strain distributions, failure sequences, damage distribution, and failure mechanisms experimentally observed is verified. Results presented in this study indicate that the concept of crack band is appropriate when modeling concrete-epoxy interfaces under general states of stresses.
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Acknowledgments
The writers would like to acknowledge the contributions of Dr. Andrew Scanlon, Dr. Charles Bakis, Dr. David Green, and Dr. Theodor Krauthammer in the development of the study presented in this publication. This material is based upon work supported by the National Science Foundation under a CAREER Grant No. NSF0330592.
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Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 1 • February 2010
Pages: 11 - 21
Copyright
© 2010 ASCE.
History
Received: Jul 22, 2008
Accepted: Apr 14, 2009
Published online: Apr 20, 2009
Published in print: Feb 2010
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