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Concrete beams with externally bonded flexural FRP-reinforcement: analytical investigation of debonding failure

Pesic, N. and Pilakoutas, K. (2003) Concrete beams with externally bonded flexural FRP-reinforcement: analytical investigation of debonding failure. Composites Part B: Engineering, 34 (4). pp. 327-338. ISSN 1359-8368


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This paper studies the problem of early concrete cover delamination and plate-end failure of reinforced concrete beams strengthened with externally bonded FRP-reinforcement. The accuracy of analytical models and finite element (FE) methods for predicting this type of failure is assessed against published experimental data. Two design approaches based on the maximum concrete tensile strength and the shear capacity of concrete beams were examined first and it was found that linear elastic analysis cannot accurately predict the brittle plate-end concrete failure. It was also found that the extent of strengthening that can be achieved is limited by the shear capacity of concrete beams. The FE analysis is used to examine the effects of internal tensile reinforcement on the magnitude of principal tensile stresses in the critical region. The non-linear behaviour of FRP-strengthened beams is also examined in the FE analysis using the smeared crack model for concrete which is shown to adequately display the inelastic deformation of the beam. Finally, the mixed mode of failure due to the combined shear and concrete cover delamination is addressed through modelling plate-end and shear crack discontinuities using the discrete crack approach.

Item Type: Article
Copyright, Publisher and Additional Information: © 2003 Elsevier. This is an author produced version of a paper subsequently published in Composites Part B: Engineering. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: A. Concrete; A. FRP-reinforcement; B. Delamination; C. Finite element analysis (FEA)
Institution: The University of Sheffield
Academic Units: The University of Sheffield > University of Sheffield Research Centres and Institutes > Centre for Cement and Concrete (Sheffield)
The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield)
Depositing User: Prof Kypros Pilakoutas
Date Deposited: 31 Jan 2011 11:36
Last Modified: 08 Feb 2013 17:30
Published Version: http://dx.doi.org/10.1016/S1359-8368(02)00139-7
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/S1359-8368(02)00139-7
URI: http://eprints.whiterose.ac.uk/id/eprint/42823

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