huangyhg

mezzanine floor framing
i am designing a small 1000 sf free-standing mezzanine floorfff"> for restaurant use. i am curious about the advantages of bar joist w/metal deck & concrete vs. w-section w/metal deck & concrete. any thoughts?
thanks!
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mike,
i would assume that you would experiance more vibration issues with the bar joist/metal deck vs the w-section/metal deck option.
steel delivery may be quicker that bar joist delivery
everything depends upon span and load. shorter spans: cold rolled joists or beams. longer spans: open web joists. obviously ow joists eat up more headroom.
you might want to consider using a pre-fab mezzanine (google it).
all kinds of decks may be used. cheapest is usually plywood over metal roof deck. wood use may downrate your building so be aware of that.
the floor area is essentially 20'x50'. bar joists would span 20' or i could have an intermediate girder and span 10' and 10'. just wanted you guys' thoughts....thanks!
i second auce's post. the bar joists would likely be problematic for vibrations, especially if being used for a dining area.
if it is a dining area, rather than storage, then you might like the more solid feel of concrete on deck. plywood will give and feel more like a resident than a commercial property.
yes i am definitely going to specify conc on decking. it seems that wide flanges will be a better choice than bar joists for both vibration concers and a quicker fab time. i now will need to figure an economical framing spacing and deck sizing. do you guys think composite decking makes sense for something this small?
if you have any headroom problems, the composite construction will save steel with lower allowable depths.
you have to have a welder on-site with the metal deck welding anyway, so use the steel studs, partial composite should be sufficient.
mike mccann
mmc engineering
composite deck is ok but i would not use composite framing for these short spans (20'). i also believe that with these short spans transient vibration would likely not be a problem.
if you're only spanning 10', i would use cold-formed joists (you don't want to call out a bunch of 10k1's).

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