A model for the prediction of the behaviour of continuous RC slabs flexurally strengthened with CFRP systems

Abstract

To predict the load-deflection response up to the collapse of statically indeterminate reinforced concrete (RC) structures, an analytical model was developed and its predictive performance was appraised by using the data obtained in experimental programs. The proposed approach is based on the force method by establishing a number of displacement compatibility equations that can provide the unknown variables. To determine the tangential flexural stiffness making part of these equations, moment-curvature relationships are determined for the cross sections representative of the structure. This model can be easily implemented according to a design format, and is applicable to statically determinate or indeterminate RC structures strengthened according to the near surface mounted (NSM) or externally bonded reinforcement (EBR) techniques. The predictive performance of the model was appraised by simulating two series of tests of RC slab strips strengthened with NSM carbon fibre reinforced polymer (CFRP) laminates.