MECHANICS BEHAVIOR OF FRP WRAPPED REBAR REINFORCED CONCRETE (I) MICROSTRUCTURE DESIGN AND ANALYSES

Fibre reinforcement plastic (FRP) has the drawbacks of poor ductility and brittle failure mode, which are impediments for substituting it for steel bar in reinforced concrete materials. These shortcomings can be overcome through material design and geometric hybrid.This paper presents a new concept of geometric hybrid which uses steel as the core with ±45°angle laminations of glass fibre impregnated with epoxy around the core. It is demonstrated that the law of mixtures can be applied to the prediction for the stress-strain behavior of the hybrid rebars.