Continuum damage modelling for concrete structures in dynamic situations

This paper deals with various aspects of the computation of reinforced concrete structures subject to dynamic loading, In a first part isotropic continuum damage is used for the analysis of the seismic CAMUS shaking table test. The presentation shows the great interference between the material behaviour, the structural effects and the boundary conditions. Modelling with a unilateral damage model and simplified finite element discretisation, including the flexibility properties of the support, Shows its good predictive capability. In the second part, a new model including the description of hysteresis loops is proposed to account for the internal dissipation. This seems to be a good way to avoid the use of a Rayleigh type damping matrix, which, in certain cases, can lead to unphysical representation of the damping dissipation. Finally an orthotropic model is presented which foreshadows now evolutions of damage modelling for dynamic Situations.