Abstract
A constitutive model based on the theory of plasticity is proposed to characterize the stress-strain behaviour of plain concrete under three-dimensional loading. The model incorporates the third stress invariant in the formulation that allows variation of shear strength with the orientation of stress paths on the octahedral plane. Also, it allows variation of the shape of the yield surface on the octahedral plane with confining pressure. An algorithm is developed and used to evaluate the associated material constants in the optimum manner. Stress-strain responses are back-predicted for a number of stress paths using the proposed model and the results are compared with experimental observations. Overall, good agreement between the experimental data and predicted response is obtained.
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