FRACTURE SIMULATION OF REINFORCED CONCRETE USING DAMAGE MODEL CONSIDERING FRICTIONAL CONTACT ON INTERFACE

Abstract

In this paper, we propose a fracture simulation method of reinforced concrete considering detailed bond behavior between reinforcing bar and concrete using a damage model considering frictional contact on interface. The bond between reinforcing bar and concrete consists mainly of adhesive force on interface, frictional force generated by sliding between materials, and pressure on lug of reinforcing bar. The pressure on lug of reinforcing bar is simulated by using a finite element model reflecting the surface shape of reinforcing bar. The fracture and frictional contact on interface are simulated by applying the damage model to thin interfacial phase on surface of reinforcing bar. The damage model is formulated by combining the scalar-valued damage variable and the Coulomb friction law in local coordinate system defined along interface. In order to verify the performance and effectiveness of the proposed method, we simulate pull-out test of round bar and deformed bar. In addition, we compare the experimental and numerical results of 4-point bend tests of RC beams using round bar and deformed bar.