Hello, My Suggestions: --You can reduce the live loads on the attic floor, remove the wall loads, --Analysis settings-load security-TS500-TS 498 ticks, --You can make the concrete C30, (it doesn't save when done) --make the narrow side of the columns 30 cm, --make the beams 30 cm, --support the stairs and solve them together, --correct the column (B) errors. Once these are done add seismic shears in both directions until they stabilize. Unver ÖZCAN
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