Mesoscale modelling of bond failure behavior of ribbed steel bar and concrete interface

Abstract

The good bond between rebar and concrete is an essential prerequisite for the bearing force of reinforced concrete structures. In the simulation method, the concrete heterogeneity and rebar characteristics were taken into account. Considering frictional resistance and the mechanical interlocking between reinforcement and concrete, the paper established meso-scale separate interaction model which researches the nonlinear bonding damage behavior ribbed bar and concrete. Based on the good agreement between the simulation results and the experimental results, the advantages of the mesoscopic mechanical analysis method were discussed first, and the bond slip behavior and failure mechanism of the reinforced concrete interface were studied. Finally, the distribution characteristics of the bond stress of the bar was analyzed. Furthermore, based on the mesoscopic numerical analysis, the influences of the aggregate distribution, thickness of concrete cover, strength of concrete, steel bar diameter and height of rib on the bond failure behavior of reinforced concrete interface are discussed, and some regular knowledge is obtained.