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Title: Process of debonding in RC beams shear-strengthened with FRP U-strips or side strips
Authors: Chen, GM
Teng, JG 
Chen, JF
Keywords: Fiber reinforced polymers (FRP)
Reinforced concrete beams
Shear failure
Shear resistance
Stress distribution
Interfacial stress
Issue Date: 15-May-2012
Publisher: Pergamon Press
Source: International journal of solids and structures, 15 May 2012, v. 49, no. 10, 1266-1282 How to cite?
Journal: International journal of solids and structures 
Abstract: Reinforced concrete (RC) beams may be strengthened for shear using externally bonded fiber reinforced polymer (FRP) composites in the form of side bonding, U-jacketing or complete wrapping. The shear failure of almost all RC beams shear-strengthened with side bonded FRP and the majority of those strengthened with FRP U-jackets, is due to debonding of the FRP. The bond behavior between the externally-bonded FRP reinforcement (referred to as FRP strips for simplicity) and the concrete substrate therefore plays a crucial role in the failure process of these beams. Despite extensive research in the past decade, there is still a lack of understanding of how debonding of FRP strips in such a beam propagates and how the debonding process affects its shear behavior. This paper presents an analytical study on the progressive debonding of FRP strips in such strengthened beams. The complete debonding process is modeled and the contribution of the FRP strips to the shear capacity of the beam is quantified. The validity of the analytical solution is verified by comparing its predictions with numerical results from a finite element analysis. This analytical treatment represents a significant step forward in understanding how interaction between FRP strips, steel stirrups and concrete affects the shear resistance of RC beams shear-strengthened with FRP strips.
ISSN: 0020-7683
EISSN: 1879-2146
DOI: 10.1016/j.ijsolstr.2012.02.007
Rights: © 2012 Elsevier Ltd. All rights reserved.
NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Solids and Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Solids and Structures, vol. 49, no. 10 (May 2012), DOI: 10.1016/j.ijsolstr.2012.02.007
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