Hello @adel.albloushi,
at the moment (version 1.3.3) the design of reinforced concrete columns and beams is not directly possible in Karamba3D.
For the design of the concrete cross sections one can use the strength values of the concrete materials together with a reduced target utilization. The reinforcement design then needs to be done in a separate step based on the cross section forces and buckling length.
– Clemens