Model coupling friction and adhesion for steel - concrete interfaces

In this paper the interface behaviour between steel and concrete, during pull out tests, is numerically investigated using an interface model coupling adhesion and friction. This model (RCCM) was developed by Raous, Cangémi, Cocu and Monerie. It is based on the adhesion intensity variable, introduced by Frémond, which is a surface damage variable and its values vary between zero (no adhesion) and one (perfect adhesion). The RCCM model is characterized by a smooth transition from total adhesion to usual Coulomb friction law with unilateral contact. The aim result of this numerical study is the generalization of the RCCM model by taking a variable friction coefficient in order to simulate the behaviour of the steel-concrete interface during a pull-out test. Identification of the parameters and validation of the model are conducted through comparisons of the simulation to experimental results conducted at the INSA of Toulouse.