Hi My Suggestions --Linear and point slab loads defined on rib and cassette slabs are not taken into account in the full rigid diaphragm solution in 8 Version either. --If you make a solution as semi-rigid diaphragm, it will be taken into account. Solve rigid diaphragm, --The consoles I have marked below in semi-rigid diaphragm give an error. (There is a bracing error.) --It is calculated when deleted. --K24-K35 enlarge as you said (center the columns) the most critical beams of your building, --Resolve the support situation of the stairs by correcting include, --You can reduce the live loads on the roof, --If there is no architectural necessity on the exterior beams, hang it or expand it. Take it easy. Ünver ÖZCAN