A non-linear thermodynamical model for steel–concrete bonding

In Reinforced Concrete structures, the concrete damage configuration as well as the crack pattern distribution depend directly on bonding, and its implementation for numerical analysis is still complicated. In this work, a new thermodynamical non linear bond model is introduced taking into account tangential bond deterioration and coupling between tangential slip and normal decohesion/penetration. For FEM implementation, the model (based on a stress–strain relationship) is supported by a non-width interface element. The calibrated material parameters are grouped in four sets: elastic behavior; tangential degradation; crack friction and confinement; and normal behavior. Finally, some numerical examples are presented in this paper.

► Development of a new thermodynamical nonlinear model for steel–concrete bonding. ► Coupling between tangential slip and normal decohesion/penetration. ► Inclusion of dissipative effects associated to crack friction and cyclic loading. ► 3-Phases bond behavior: elastic link, interlocking damage, post-coalescence damage. ► Use of non-width interface elements based on classical finite element formulation.