Modeling Debonding Failure in FRP Flexurally Strengthened RC Members Using a Local Deformation Model
Publication: Journal of Composites for Construction
Volume 11, Issue 2
Abstract
Reinforced concrete (RC) beams and slabs can be strengthened by bonding fiber-reinforced polymer (FRP) composites to their tension face. The performance of such flexurally strengthened members can be compromised by debonding of the FRP, with debonding initiating near an intermediate crack (IC) in the member away from the end of the FRP. Despite considerable research over the last decade, reliable IC debonding strength models still do not exist. The current paper attempts to correct this situation by presenting a local deformation model that can simulate IC debonding. The progressive formation of flexural cracks, and the associated crack spacings and crack widths are modelled from initial cracking to the onset of debonding. The bond characteristics between the longitudinal steel reinforcement and concrete, and the FRP and concrete, as well as the tension stiffening effect of the reinforcement and FRP to the concrete, are considered. The FRP-to-concrete bond-slip relation is used to determine the onset of debonding. The analytical predictions compare well with experimental results of FRP-strengthened RC cantilever slabs.
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Acknowledgments
The writers wish to thank the University of Technology, Sydney, and RMIT University for the financial support provided through 2003/2004 ATN Research Staff Exchange Scheme Grants awarded to each writer. The first writer was employed by the University of Technology, Sydney, at the time of writing the paper.
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Information
Published In
Journal of Composites for Construction
Volume 11 • Issue 2 • April 2007
Pages: 184 - 191
Copyright
© 2007 ASCE.
History
Received: Jun 15, 2005
Accepted: Nov 16, 2005
Published online: Apr 1, 2007
Published in print: Apr 2007
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