Hello -- Since it is on the rigid floor, reinforcement increase is also normal in S04 and other outer columns (S20). When going down to the lower floors, there is a decrease in the reinforcement as the curtains carry the moments. --Fix the errors in the geometry control.(20 cm wide beam gets stuck in the column.) My suggestions --Do not solve the project with a rigid diaphragm, it does not fit the program logic without a double floor in between. --If you solve it semi-rigid according to version 7, it cannot be concluded. You need to correct the errors in the geometry control and make calculations. If you solve it semi-rigid according to the --8 version, it does the solution, but you have to correct the errors in the Geometry control and make calculations. You also need to fix calculation result errors. -- Since the first place of the building to collapse in the event of an earthquake will be the stairs, model the staircase correctly and solve it together with the system. -- WHEN THE EARTHQUAKE REGULATION CHANGES; SO THE SOLUTION WITH A RIGID DIAPHRAGM WILL BE AVOIDED, SOLVE ALL YOUR FOLLOWING CONSTRUCTIONS WITH A SEMI-RIGID DIAPHRAGM. Take it easy Unver ÖZCAN