Numerical simulation on flexural crack induced debonding failure in FRP strengthened concrete beams

摘要

Intermediate crack debonding failure is one of the most common failure modes in the FRP reinforced concrete structures. In order to simulate the formation of debonding failure accurately, this paper adopts an elastic-plastic damage constitutive law to model concrete and take into account the interface of three directions simultaneously, namely the normal direction and the two shear direction of the interface to establish a precise mixture of bilinear cohesive model. The model is used for finite element analysis of debonding failure during loading process in the FRP-concrete interface. Comparisons with experimental results of CFRP concrete joints, the finite element model in this paper can well simulate the damage evolution and debonding process of the FRP reinforced concrete beam in the mid span, which provides a theoretical basis for its wider applications in practical engineering.