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In this paper, to establish a proper method for analyzing failure mechanism of RC beams flexural strengthened with Aramid FRP (AFRP) sheet, three-dimensional non-linear numerical analyses were carried out using DIANA code. Here, predetermining crack distribution based on the experimental results and applying interface element for these cracks, debonding mechanism of AFRP sheet is precisely analyzed. From this study, following results were obtained: 1) loaddisplacement curve and strain distribution can be predicted with good agreement; 2) failure type of the RC beams can be identified; and 3) it is analytically made clear that AFRP sheet is debonded due to peeling action of a concrete block formed in the lower cover concrete

Nonlinear Numerical Analysis on Failure Behavior of RC Beams Strengthened with AFRP Sheet