I want to model a concrete column under pressure that the stress and strain of the concrete going to the plastic area under this pressure. How can I model the concrete in this area in ABAQUS? and how can I determine the time increments?
I would not recommend using standard plasticity (which is von Mises plasticity and intended for use in metals) with concrete. Abaqus contains several material models that are intended to work with concrete, see the materials section of the manual.