PEELING-OFF PHENOMENON IN FRP STRENGTHENED CONCRETE BEAMS DUE TO THERMAL RESIDUAL STRESS

摘要

Peeling-off phenomena in FRP strengthened concrete beams are investigated in this paper.Based on the beam theory and the fracture mechanics,a new theoretical model is proposed to analyze the peeling-off behavior near FRP-concrete interfaces,which is governed by residual thermal stresses.Numerical examples are presented to provide a clear insight into the failure mechanism.Some suggestions are provided for the optimal design of FRP strengthened structures.