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Is this an industrial setting? The 40 psf load seems very low for a manufacturing type setting.
Ok. If this is your home, then I'll use something like a 50 psf live load.
What thickness of concrete deck will you use?
Do you know what spacing you want for the joists?
I'll use a 4' spacing
You can plan for 18k10 or 20k9 joists at 4' on center.
I used 22'-9" for the beam span and a live load of 50 psf on top of a 55 psf dead load.
Yes. I'll be here.