EDF studies the behavior of concrete containment buildings since delayed strains of concrete cause the pre-stress to decrease, impairing the containment capacity.
This work deals with sub-modelling of a representative part of the VeRCoRs inner wall cylindrical part submitted to delayed strains.
First in this paper, a phenomenological constitutive law describing these delayed strains is identified on lab experiments made on VeRCoRs concrete (sealed and drying mass-loss, shrinkage and creep).
This law is subsequently used to study the effect of the inhomogeneity of stress and strain fields through the wall due to the presence of passive and active reinforcements.
To do so, a representative periodic model of the VeRCoRs wall is studied.
First, the effect of the stiffness brought by the steel parts is studied.
It is found that they contribute to around 8\% of the horizontal and hoop stiffness, and have an even greater impact on radial strains.
Second, the stress concentrations around steel bars and pre-stress ducts are observed.
Tensions up to 2~MPa can appear after 7~years of creep due to the rigid inclusion effect of the steel bars and ducts.
If the transverse reinforcements are taken into account, these tension efforts are largely decreased, confirming the important role of these bars against delamination of pre-stressed concrete walls.