Generic Debonding Resistance of EB and NSM Plate-to-Concrete Joints
Publication: Journal of Composites for Construction
Volume 11, Issue 1
Abstract
It is well established that adhesively bonding plates to the surfaces of reinforced concrete members is an efficient retrofitting approach. Specifically, two techniques have emerged: Using thin externally bonded (EB) sheets/plates and near-surface mounted (NSM) strips/bars. A good amount of research has been undertaken worldwide to understand the fundamental behavior describing such adhesively bonded plate-to-concrete joints. Unfortunately, until now, no generic model exists to determine the debonding resistance of both retrofitting techniques. In this paper, a generic analytical model is derived to determine the debonding resistance of any adhesively bonded plate-to-concrete joint using an idealized linear-softening local interface bond-slip relationship. The model is derived using a unique definition of the debonding failure plane and confinement ratio such that it is suitable for both the externally bonded and near-surface mounted techniques. The model is validated by comparison with existing push-pull data as well as 14 new push-pull tests with varying plate cross-section aspect ratios. Comparison with an existing well-known model demonstrates the suitability of the proposed generic model. The model can be used to predict the intermediate crack debonding resistance of strengthened reinforced concrete members.
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Acknowledgments
The writers acknowledge the invaluable expertise and assistance of David Hale at the Chapman Laboratory of the School of Civil and Environmental Engineering at the University of Adelaide. The second writer also thanks the University of Putra, Malaysia, for financial support received.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 11 • Issue 1 • February 2007
Pages: 62 - 70
Copyright
© 2007 ASCE.
History
Received: Oct 10, 2005
Accepted: May 26, 2006
Published online: Feb 1, 2007
Published in print: Feb 2007
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