The Incorporation of Localized Softening in a Constitutive Model for Frictional Materials

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The focus of this research is to investigate a formulation that yields simultaneously the essence of softening and localization phenomena. The three-dimensional model will be based on viscoplasticity in which the yield function contains a strain gradient in addition to the usual internal variables. The non-local formulation circumvents many of the arguments against the existence of strain softening. An investigation will be made of a numerical scheme to obtain solutions to structural problems with localized softening features. The accuracy of the model and the usefulness of the approach for predicting softening will be demonstrated by making comparisons between theoretical and experimental data on concrete specimens and on reinforced concrete beams subjected to combined transverse and axial loading.