FraMCoS 7 2010 Jeju, South Korea

An analytical model for FRP concrete debonding based on an exponential softening law

Among rehabilitation strategies, bonding of Fiber Reinforced Polymers (FRP) sheets/plates is becoming more and more popular, especially for what concerns concrete structures. The performance of the interface between FRP and concrete is one of the key factors affecting the behavior…

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Year 2010
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Abstract

Among rehabilitation strategies, bonding of Fiber Reinforced Polymers (FRP) sheets/plates is becoming more and more popular, especially for what concerns concrete structures. The performance of the interface between FRP and concrete is one of the key factors affecting the behavior of the strengthened struc- ture. Up to now, closed-form analytical solutions exist only for the local bond-slip law with linear softening. Aim of the present paper is to show that analytical solutions can be achieved also assuming an exponential decaying softening law. Accordingly, the expressions for the interfacial shear stress distribution and the load- displacement response are derived for the different loading stages. A full parametric analysis of the problem has been performed, highlighting the size effect on the structural behavior as well as the effects of the bond length, of the FRP stiffness and of the interface constitutive law. A comparison with other analytical models available in the literature concludes the paper.