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This work focuses on the numerical modelling of confined concretes whensubjected to multiaxial loading accounting for a nonlinear material response.Particularly, an improved return mapping procedure is here presented to copewith the issue of singularities (corners) in the yield surface, able to catchlocally the optimal return point on the active yield surface. The algorithm isapplied to the Menetry and Willam's yield surface, with a plastic potential assuggested by Grassl and the softening law proposed by Cervenka suitable forconcrete materials. The model capabilities to reproduce the confined behaviourof concrete, as well as its post-peak behaviour, and to predict perfectplasticity or softening are here discussed. The proposed approach can beapplied to any elastoplastic material with singular yield surface along thehydrostatic axis.

Apex control within an elasto-plastic constitutive model for confined concretes