Simulating bond failure in reinforced concrete by a plasticity model

In this work, an axisymmetric plasticity model is used to simulate the concrete-steel interface behavior. A nonlocal correction is here introduced in order to capture the degradation of the bond due to splitting cracks. Damage of the interface is also modeled as a function of the rib spacing, allowing application of the model to different bar diameters. The model is able to capture the transition from splitting to pull-out failure and to yielding of bars with the same set of predefined interface parameters, showing the predictive character of the model. The development of macroscopic cracks is also correctly simulated.

► A plasticity bond model is used to simulate concrete-steel interface.
► Interface model is nonlocal.
► It can be applied to different bar diameters.
► Effects of confinement and anchorage conditions are automatically considered.
► Failure by pull-out, splitting, steel yielding and primary cracks are captured.