A GENERAL METHOD OF DESIGN AT ULTIMATE LIMIT STATE

Fortunately a close examination of the limit theorems of the theory of plasticity points to a way of overcoming both of the limitations stated above. 18.2 LIMIT THEOREMS OF THE THEORY OF PLASTICITY Theory of plasticity is based on three fundamental assumptions:  The material has unlimited ductility.  Failure by buckling is prevented.  At collapse sufficient areas yield to convert the structure into a mechanism.