When a moment redistribution analysis is carried out without explicitly checking the rotation capacity, it is convenient that the depth of the neutral fibre be limited to the values specified by the code that is being applied.
As of the 2015.j version, CYPECAD allows users to limit this depth, so it can be considered in the design, by introducing the "x/d" ratio, where "x" is the depth of the neutral fibre and "d" is the effective depth of the beam section.
This option can be activated in the "Top reinforcement distribution coefficient" dialogue box (see image).