Theoretical and numerical study on the bond behavior between reinforcing steel and concrete

The bond-slip interaction between reinforcing steel and concrete plays a crucial role in transferring stress and the synergistic mechanical behavior of reinforced concrete members. Based on the interface tensile mechanism of reinforcing steel and concrete, a novel simple bond-slip model was developed to consider the tensile fracture behavior of the interface in different stress stages. According to the influencing factors including concrete strength, cover thickness, reinforcing steel rib spacing, stirrup arrangements, reinforcing steel diameter and anchorage length, characteristic points are established. The results show that the calculated results of this model agree well with the experimental results under monotonic loading. Finally, the different stages of slip behavior are simulated with the elastic, plastic and damage behavior of the connector elements according to a three-dimensional modeling method. Comparisons that were performed between the nonlinear numerical simulations and theoretical results have clearly shown that the connector element can predict the interface behavior of reinforcing steel and concrete.