Analytical study on bond behavior of CFRP bars epoxied into timber elements

Righetti, Luca, Corradi, Marco and Borri, Antonio (2015) Analytical study on bond behavior of CFRP bars epoxied into timber elements. In: 3rd International Conference on Structural Health Assessment of Timber Structures (SHATIS '15), 9-11 Sep 2015, Wroclaw, Poland.

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Abstract

There is growing evidence that Fibre-Reinforced Polymer (FRP) materials have been proposed and used as an advanced method and an economical solution for strengthening timber elements. Reinforcement is usually bonded using epoxy or thermoplastic resins. There is, therefore, a pressing need to generate data on their bonding behaviour in order to engender confidence in FRP-reinforced timber structures. An experimental program was carried out to analyse the bond behaviour of Carbon Fibre Reinforced Polymer (CFRP) bars epoxied into small notches made into prismatic elements with square cross section in fir and chestnut wood using a commercially-available epoxy resin. Bonded length varying from 150 to 250 mm in both wood species. Failure modes, tensile strength and bond strength of CFRP bars have been evaluated. Results indicated that the collaboration between timber and bars increased with increases of the bonding length but it was not strongly depended on the timber type. Distribution of shear and normal stresses and strains were also investigated.

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