Hello. Error B appears. I reduced it to 1 column. The error appeared again. I wonder what is the reason, my esteemed colleagues. There is nothing I haven't done to fix this error. I would appreciate if my experienced colleagues can help. Thanks in advance. Take it easy. [/quote] Hello, In the Beam Reinforced Concrete dialog, it is seen that excessive bending reinforcement is used unnecessarily in the beams connected to the S23-S24 columns. Uncheck the DS columns and analyze again. In this case, problem B in columns is solved. In addition; Since the wall shear force (alphaS) ratios are above 0.40, the ductility level can be selected as a mixed system. In this case, the Joint Break safety (B) check is not performed on the columns. Review the incorrect column placements in the geometry control. Good work[/quote] Thank you very much for your reply. The problem goes away when you mix it. Well, we calculate this alphas manually, or rather, how do we calculate it for a single layer? Thanks in advance.