APPROXIMATIONS OF CONCRETE DEFORMATION DIAGRAMS IN THE NONLINEAR CALCULATION OF NON-CENTRALLY COMPRESSED TUBULAR CONCRETE ELEMENTS

The possibility of using some approximations of concrete deformation diagrams to calculate non-centrally compressed tubular concrete elements is considered. The results of nonlinear calculation of stress-strain state parameters are compared with experimental data from the formed sample of studies. Approximation of the concrete deformation diagram with a horizontal section following the peak point makes it possible to obtain stress-strain state parameters that are more consistent with experimental data.