Steel form deck with concentrated load
Steel form deck with concentrated load
(OP)
I have a mezzanine floor framed with open web steel bar joists 2'-0" o.c., 9/16" 26 gage steel form deck, 4" total depth slab with 6x6-W2.1xW2.1 WWF. The contractor would like to put a 14,000 pneumatic tire lift on the slab. Actually, they put the lift on the slab without asking and then were told to take the thing off until the EOR approved it. I cannot find a way to make this work by the numbers even though it did work in reality. Any ideas?






RE: Steel form deck with concentrated load
What about putting some thick plywood over it to help spread the load?
RE: Steel form deck with concentrated load
RE: Steel form deck with concentrated load
Tough call to approve the use of a vehicle on a building floor that wasn't originally designed for it; especially since you don't know where it will be driven, what loading will be on it, etc. Be careful.
RE: Steel form deck with concentrated load
Here is that point load reference you were after:
http://www.njb-united.com/usd/ddds/data33.pdf
Hope this helps.
Also the other option is to provide temporary props to the floor below and share the loads (depending on relative deflections)
RE: Steel form deck with concentrated load
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RE: Steel form deck with concentrated load
RE: Steel form deck with concentrated load
RE: Steel form deck with concentrated load
RE: Steel form deck with concentrated load
14,000 pounds/400 PSF is 35 sqyuare feet. Not a terribly large area.
What is are the plan dimensions of the lift? Probably bigger than 35 square feet if the lift is that heavy.
As for the joist: What live load were the joists designed for? What else is up there at the moment? If not much else is up there, and the load is shared between a few joists, the joists may not be that much overloaded, if at all.
Given the size of the deck, and the spacing of the joists, this does not seem entirely unreasonable to me. I have allowed similiar sized lifts on elevated floors in the past. If the floor is of a fairly heavy design (and the 400 psf LL capacity floor idicates that it might be), then 14,000 pounds is not all that much area occupied.
RE: Steel form deck with concentrated load