Abstract
A great deal of research has been dedicated to showing the effects of failure criteria on the analytical results of load-carrying capacities of structures. A famous example was given by Humpheson and Naylor (1975), and was further studied by Zienkiewicz and Pande (1977). Figure 10.1 shows some differences between results the obtained for a plane strain flexible footing on a weightless material (Humpheson and Naylor 1975). The Mohr-Coulomb strength theory, the Williams and Warnke criterion, the Gudehus and Argyris criterion and various circular cone approximations, i.e. extension cone, compromise cone, compression cone and the Drucker-Prager criterion (inscribed cone of the Mohr-Coulomb semi-infinite hexagonal cone with unequal sides) have been used. They show a great difference between results obtained by using various failure criteria. Obviously, the question arises which one of these results should be preferred, because there is only one reasonable result for a given material and structure.
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