This paper presents a new modeling of bound-slip phenomena at steel-concrete interface concerning both constitutive and numerical modeling. The constitutive modeling is set up within a nearly standard thermodynamic approach which considers the interface as a surface of discontinuity. In the numerical modeling, we take into account in an explicit way the relative displacement at the interface. Assuming isotropic plastic behavior, standard continuous plasticity is extended to the interface to account for bond deterioration. A return mapping algorithm is used for the integration of relative plastic displacement. The formulation has been applied to truss elements and implemented in a finite element program.
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