CUED Publications database

Prediction of FRP debonding using the global-energy-balance approach

Burgoyne, CJ and Achintha, M and Guan, GX (2012) Prediction of FRP debonding using the global-energy-balance approach. American Concrete Institute, ACI Special Publication. pp. 1-18. ISSN 0193-2527

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Abstract

A major research program was carried out to analyze the mechanism of FRP debonding from concrete beams using global-energy-balance approach (GEBA). The key findings are that the fracture process zone is small so there is no R-curve to consider, failure is dominated by Mode I behavior, and the theory agrees well with tests. The analyses developed in the study provide an essential tool that will enable fracture mechanics to be used to determine the load at which FRP plates will debond from concrete beams. This obviates the need for finite element (FE) analyses in situations where reliable details of the interface geometry and crack-tip stress fields are not attainable for an accurate analysis. This paper presents an overview of the GEBA analyses that is described in detail elsewhere, and explains the slightly unconventional assumptions made in the analyses, such as the revised moment-curvature model, the location of an effective centroid, the separate consideration of the FRP and the RC beam for the purposes of the analysis, the use of Mode I fracture energies and the absence of an R-curve in the fracture mechanics analysis.

Item Type: Article
Uncontrolled Keywords: Branson's model External strengthening Fracture mechanics FRP Interface debonding Mixed-mode crack
Subjects: UNSPECIFIED
Divisions: Div D > Structures
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:16
Last Modified: 08 Dec 2014 02:21
DOI: