Hi Charles,
in Karamba3D a standard reinforced concrete shell cross section consists of five layers. ‘0’ corresponds to the concrete cross section, the others to the upper and lower reinforcement in two directions each.
You can select the layer to be displayed via ShellView’s ‘LayerInd’ input. For details please see the manual.
The translation from layer-thickness ‘t’ in centimeter to kg/cm2 steel is t*7850/100^3.
The ‘Optimize Reinforcement’-component does not change the concrete cross section thickness, only the thickness of the reinforcement layers.
Best,
Clemens