Fiber reinforced plastic (FRP) plates can be bonded to the tension face of reinforced concrete beams to increase the flexural capacity. In this type of beams, high interfacial shear and normal stress concentrations at the end of the plate may result in debonding of the plate or local shear failure in the concrete beam. To avoid these types of failure, shear and normal stresses in the adhesive layer must be considered in design. This paper presents closed form solutions for calculating stresses at the interface of FRP plate and the adhesive layer. This method has been developed based on equilibrium of forces and compatibility of the deformations in the adhesive layer. Shear and normal stress concentrations predicted by this method showed close agreement to both finite element analysis and experimental results. This method provides the required tools for designing this type of beams against failure due to shear and normal stress concentrations at the end of the plate.
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