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Fracture energy of the concrete-FRP interface in strengthened beams

Fracture energy of the concrete-FRP interface in strengthened beams
Fracture energy of the concrete-FRP interface in strengthened beams
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.
debonding, fracture mechanics, interface, mixed-mode, strengthened beams
0013-7944
Achintha, M.
8163c322-de6d-4791-bc31-ba054cc0e07d
Burgoyne, C.
5a90ba6f-f862-48b8-8273-f44b18bbb2dd
Achintha, M.
8163c322-de6d-4791-bc31-ba054cc0e07d
Burgoyne, C.
5a90ba6f-f862-48b8-8273-f44b18bbb2dd

Achintha, M. and Burgoyne, C. (2013) Fracture energy of the concrete-FRP interface in strengthened beams. Engineering Fracture Mechanics. (doi:10.1016/j.engfracmech.2013.07.016).

Record type: Article

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.

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e-pub ahead of print date: 10 August 2013
Keywords: debonding, fracture mechanics, interface, mixed-mode, strengthened beams
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 355511
URI: https://eprints.soton.ac.uk/id/eprint/355511
ISSN: 0013-7944
PURE UUID: a76c9dab-733a-4edf-b1af-7de035eaac27
ORCID for M. Achintha: ORCID iD orcid.org/0000-0002-1732-3514

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Date deposited: 12 Aug 2013 13:46
Last modified: 20 Jul 2019 00:43

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Contributors

Author: M. Achintha ORCID iD
Author: C. Burgoyne

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