Plasticity in concrete nonlinearity under triaxial confinement

Abstract

The constitutive law for plasticity of damaged concrete was proposed under triaxial stresses. The plastic deformation was drawn from the entire nonlinearity and formulated in terms of the elastic strain, which is regarded as the indicator of the internal stresses of damaged continuum. The progress of the plastic deviator (shear) was found not to be dependent on the confinement, but merely on the elastic deviator. On the contrary, the dilatancy, which is the growth of the volumetric plasticity associated with the shear one, was elucidated to be strongly influenced by the magnitude of confinement. The flow rule to regulate the plastic increment in shear was also proposed with respect to the updated elasticity. The model of plasticity of the damaged continuum was experimentally verified with regard to the plastic Poisson's effect theoretically derived under compression.