Three-Parameter Model for Debonding of FRP Plate from Concrete Substrate
Publication: Journal of Engineering Mechanics
Volume 132, Issue 5
Abstract
Concrete beams retrofitted with bonded fiber reinforced plastic (FRP) plates often fail by debonding of the plate from the concrete surface. To predict the failure load in design, a proper debonding model is required. As debonding is a nonlinear process involving material softening, it can be analyzed once the interfacial shear versus sliding relationship is known. Recent experimental results indicate that the simplest relationship should involve three parameters: the maximum shear stress for debonding to initiate, the initial residual stress right after debonding occurs, and a parameter governing the reduction of shear stress with sliding. In this paper, a FRP debonding model based on these three parameters is developed. The applicability of the model is verified through comparison with experimental results. Through a systematic parametric study, the effect of various material and geometric properties on the debonding process is investigated. Implications to the design of FRP strengthened members are highlighted.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 132 • Issue 5 • May 2006
Pages: 509 - 518
Copyright
© 2006 ASCE.
History
Received: Dec 6, 2002
Accepted: Jul 9, 2004
Published online: May 1, 2006
Published in print: May 2006
Notes
Note. Associate Editor: Stein Sture
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