CUED Publications database

Fracture energy of the concrete-FRP interface in strengthened beams

Achintha, M and Burgoyne, C (2013) Fracture energy of the concrete-FRP interface in strengthened beams. Engineering Fracture Mechanics, 110. pp. 38-51. ISSN 0013-7944

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Abstract

To determine the load at which FRPs debond from concrete beams using global-energy-balance-based fracture mechanics concepts, the single most important parameter is the fracture energy of the concrete-FRP interface, which is easy to define but difficult to determine. Debonding propagates in the narrow zone of concrete, between the FRP and the (tension) steel reinforcement bars in the beam, and the presence of nearby steel bars prevents the fracture process zone, which in concrete is normally extensive, from developing fully. The paper presents a detailed discussion of the mechanism of the FRP debonding, and shows that the initiation of debonding can be regarded as a Mode I (tensile) fracture in concrete, despite being loaded primarily in shear. It is shown that the incorporation of this fracture energy in the debonding model developed by the authors, details of which are presented elsewhere, gives predictions that match the test results reported in the literature. © 2013 Elsevier Ltd.

Item Type: Article
Uncontrolled Keywords: Debonding Fracture mechanics Interface Mixed-mode Strengthened beams
Subjects: UNSPECIFIED
Divisions: Div D > Structures
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:24
Last Modified: 08 Dec 2014 02:17
DOI: 10.1016/j.engfracmech.2013.07.016