A new homogenised constitutive model DHRC damage and debonding for reinforced concrete structures under cyclic solicitations and seismic loading

5 September 2013

by Ch. Combescure, F. Voldoire and S. Fayolle, EDF R&D / AMA

A new stress resultant constitutive model DHRC for reinforced concrete plates under cyclic solicitations including shear walls has been introduced in version 12. It accounts for the concrete damage and rebar/concrete debonding and has been built with by the periodic homogenisation approach (averaging method).

The parameters identification of this nonlinear standard generalised constitutive model is based upon periodic homogenisation calculations. DHRC enables the modelling of any type of steel rebar grid and irreversible strains stemming from steel/concrete debonding while preserving the CPU effectiveness of other types of analyses such as 3D or multilayer shells for instance.

Figure 1 : Reduced scale model SMART at CEA

Here is a numerical application of this new model: it deals with the seismic analysis of a reduced scale model buliding : the SMART experimental campaign, see Figure 2, on which we observe the whole dissipated energy density in sheared walls during the transient.

Figure 2 : Code_Aster nonlinear transient dynamic simulation with “DHRC” constitutive model : seismic test on a reduced scale ¼ model buliding : “SMART” (CEA-EDF project), under multidirectional ground acceleration (PGA 0,2g). Total dissipated energy density, by damage and debonding.

References :

  • Formulation d’un modèle homogénéisé de plaque en béton armé pour des applications sismiques. Ch.Combescure, Thèse de Doctorat, Université Pierre et Marie Curie, septembre 2013.