CALCUL A LA RUPTUR: REGULARISATION DE NORTON-HOFF ET LAGRANGIEN AUGMENTE.

This paper describes a kinematic method for yield design which leads to a convenient numerical treatment of three-dimensional bodies and nondifferentiable yield criteria. The kinematic problem is first regularized through the introduction of the Norton-Hoff viscoplastic fluid associated with the yield criterion, then numerically solved by augmented Lagrangian techniques. Convergence results are derived, and numerical examples are presented, including limit load computations of two-dimensional structures made of truncated Coulomb material or of Camclay, and the computation of the bearing capacity of a square foundation over a purely coherent soil.