Hello My suggestions; --Make the concrete value C30, --Solve the structure as semi-rigid, (When it is solved without changing anything, it gives a high relative story drift error. Adding Curtains in both directions is appropriate.) --You can make a curtain instead of the K11 beam, --D02 on the ground floor -Change the D15 direction, --Let the rib gaps pass through the ribs (D01), --Remove the DS ticks and solve them, --Reduce the floor live loads in the attic, remove the wall loads, --Analysis settings-Load security-TS498 ex. Activate apply load reduction, activate Use earthquake load on foundation-ground and raft. The average may be insufficient, -- Brace the ladder and solve it together with the structure, -- Let the rib beams center the columns. Unver ÖZCAN