Damage Approach for the Prediction of Debonding Failure on Concrete Elements Strengthened with FRP
Publication: Journal of Composites for Construction
Volume 11, Issue 4
Abstract
In this study, experimental and numerical procedures are proposed to predict the debonding failure of concrete elements strengthened with fiber-reinforced polymers (FRPs). Such debonding is modeled as a damage process, which takes place in a band along the bond line (crack band). Three-point bending tests were designed to obtain the softening curve of the crack band. The numerical simulations are conducted using a plastic-damage model. In this approach, the damage resulting in debonding is defined using the softening curve of the crack band. Numerical results are validated against experimental results obtained from single-lap shear tests. The numerical models were capable of predicting the experimentally observed load versus strain behavior, failure load, and failure mechanism of the single-lap shear specimens. The predictive capabilities of the numerical approach presented here were further investigated by means of a parametric study of the single-lap shear test. Results from this study indicate the applicability of the crack band approach to predict the behavior of concrete–FRP joints; they also indicate that the failure load determined from a single-lap shear test is geometry dependent.
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Acknowledgments
The research activities described in this paper have been supported by a CAREER grant from the National Science Foundation (CMS-0330592). This support is gratefully acknowledged.
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Information
Published In
Journal of Composites for Construction
Volume 11 • Issue 4 • August 2007
Pages: 391 - 400
Copyright
© 2007 ASCE.
History
Received: Sep 15, 2005
Accepted: Sep 13, 2006
Published online: Aug 1, 2007
Published in print: Aug 2007
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