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Open AccessArticle

Bond Strength of Composite CFRP Reinforcing Bars in Timber

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Department of Mechanical and Construction Engineering, Northumbria University, 212 Wynne-Jones Building, Newcastle upon Tyne NE1 8ST, UK
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Department of Mechanical and Construction Engineering, Northumbria University, 209 Wynne-Jones Building, Newcastle upon Tyne NE1 8ST, UK
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Department of Engineering, University of Perugia, 92 Via Duranti, Perugia 06125, Italy
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Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Materials 2015, 8(7), 4034-4049; https://doi.org/10.3390/ma8074034
Received: 2 June 2015 / Revised: 16 June 2015 / Accepted: 29 June 2015 / Published: 3 July 2015
(This article belongs to the Section Structure Analysis and Characterization)
The use of near-surface mounted (NSM) fibre-reinforced polymer (FRP) bars is an interesting method for increasing the shear and flexural strength of existing timber members. This article examines the behaviour of carbon FRP (CFRP) bars in timber under direct pull-out conditions. The objective of this experimental program is to investigate the bond strength between composite bars and timber: bars were epoxied into small notches made into chestnut and fir wood members using a commercially-available epoxy system. Bonded lengths varied from 150 to 300 mm. Failure modes, stress and strain distributions and the bond strength of CFRP bars have been evaluated and discussed. The pull-out capacity in NSM CFRP bars at the onset of debonding increased with bonded length up to a length of 250 mm. While CFRP bar’s pull-out was achieved only for specimens with bonded lengths of 150 and 200 mm, bar tensile failure was mainly recorded for bonded lengths of 250 and 300 mm. View Full-Text
Keywords: timber; composite materials; carbon fibre; epoxy resin; bonding; testing timber; composite materials; carbon fibre; epoxy resin; bonding; testing
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MDPI and ACS Style

Corradi, M.; Righetti, L.; Borri, A. Bond Strength of Composite CFRP Reinforcing Bars in Timber. Materials 2015, 8, 4034-4049.

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