Variant of the deformation diagram of concrete under uniaxial and volumetric stress state

Variants of diagrams for the description of the stress-strain state of concrete under uniaxial and volumetric stress state at different levels and stages of deformation have been considered. A variant of nonlinear analytical dependence between stresses and relative deformations of concrete under uniaxial stressed state described by one continuous polynomial function over the entire range of deformation, including the description of the range of limiting deformations on the descending branch of the diagram, is proposed. The obtained dependence has a number of advantages for the calculation of reinforced concrete structures compared to other known variants of diagrams. The use of this dependence as the initial characteristics of concrete properties in the defining relations to describe the volumetric stress state of concrete more fully corresponds to the physical meaning of the law of deformation of concrete, has sufficient accuracy and can be recommended for practical use in the design of reinforced concrete structures.