Concrete on Metal Decking dead Load Question
Concrete on Metal Decking dead Load Question
(OP)
I'm working on a structural remediation of a library and have been supplied live loads and steel member sizes to determine my dead loads for temporary shoring. The client wants to remediate by reinforcing the underside of the second floor, so temporary shoring will be required. Now, the drawing that was supplied to me for reference calls out 2.5" OF CONCRETE OVER 1.5" METAL DECK; TOTAL DEPTH = 4". For now, I'm assuming the concrete to be 150 #/ft^3. What should I use for the metal decking weight? Does anyone have any good tips? Should I just calculate a 4" thick slab of concrete and go with that? All suggestions are appreciated, and sorry for my ignorance. I'm a new engineer without the benefit of a Civil or Structural P.E. in my office, so good advice has been hard to come by. (My employer has told me for the past year and a half that they have been trying to find one...)






RE: Concrete on Metal Decking dead Load Question
Assuming 1 1/2" composite metal deck with 2 1/2" normal weight concrete fill (4" total), the catalog gives a dead load of 39 psf.
RE: Concrete on Metal Decking dead Load Question
RE: Concrete on Metal Decking dead Load Question
1. Manufacturer of existing metal decking (actual dimensions used)?
2. Actual weight of concrete used?
3. The true thickness of the concrete, not the theoretical thickness?
4. Do you have "design drawings" or "as-built drawings"... there may have been changes?
Also consider ZTENG's advice about possible LL.
For the weight of the concrete / metal decking composite (by itself) I would assume the 4" of concrete (50 psf) that you have proposed.
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RE: Concrete on Metal Decking dead Load Question
This will delay your professional timetable.
Mike McCann
MMC Engineering
RE: Concrete on Metal Decking dead Load Question
I would use the 39#, it won't be much heavier if at all.
I usually put a 40# construction load on a new slab, but you will be underneath it, so I don't know.
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Concrete on Metal Decking dead Load Question
RE: Concrete on Metal Decking dead Load Question
RE: Concrete on Metal Decking dead Load Question
RE: Concrete on Metal Decking dead Load Question
RE: Concrete on Metal Decking dead Load Question