INTEGRATION ALGORITHMS FOR CONCRETE PLASTICITY

Presents a computational algorithm for the numerical integration of tr iaxial concrete plasticity formulations. The specific material formula tion at hand is the so-called extended leon model for concrete. It is based on the flow theory of plasticity which entails isotropic hardeni ng as well as fracture energy-based softening in addition to non-assoc iated plastic flow. The numerical algorithm resorts to implicit integr ation according to the backward Euler strategy that enforces plastic c onsistency according to the closes-point-projection method (generalize d radial-return strategy). Numerical simulations illustrate the overal l performance of the proposed algorithm and the significant increase o f the convergence rate when the algorithmic tangent is used in place o f the continuum operator.