Meschke's computational approach for plasticity-based 3D concrete model

Considers Meschke's computational approach for plasticity-based concrete models. In this approach yield functions, stresses, strains and consistent tangent moduli are formulated in terms of pricipal directions. The actual stresses and strains according to local elements coordinate axis are determined by means of the well-known transformation rules. In the present work, the computer code for 3-D Rankine multisurface plasticity model and for the proposed Meschke computational approach have been implemented into DIANA by means of the user-supplied subroutine USRMAT.