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Membrane Diaphragm or not?

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While using RISA-3D to COMPLETELY MODEL (model every single beam and column) a 3-story steel building with conc. fills over steel deck floors (2nd & 3rd floor) and steel deck (no conc. fills) roof, shall I define "Membrane Diaphragm" (per RISA-3D's tool) or not? from your engineering judgement?

Will it make any difference if the lateral system is either MOMENT FRMAES or BRACED FRAMES?

How about if this is a conc. building with conc. floors and roof?

James



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