Interior mezzanine structural design
I'm designing a 22' x 8' x 8'6" high mezzanine, and want a steel 4 post frame to support it --
flooring material will be 1 1/4" wood decking. The 4 posts (I'm assuming either 3" SQ or 4" SQ) will be approximately in a 14'x 8' grid (flush on the 8' dimension and recessed to create 4' cantilevers in the 22' dimension)
so what size beams will I need to span the 22'? I'm thinking this needs to be a "bolt together" structure (with a few welded components) so we can assemble easily in my existing building.
Suggestions? I know the columns will need plate bases to sit on the existing 5-6" slab.