Cast-in-place Conc + Steel Elevated Parking Structure
Cast-in-place Conc + Steel Elevated Parking Structure
(OP)
I have a 2 level elevated steel parking structure with cast-in-place concrete slab on metal form deck. The structure will be open and exposed to environment. AISC Steel Design Guide 18 (Steel Framed Open Deck Parking Structures) recommends the following:
1) Use of normal weight concrete
2) Use of 4,500 psi concrete (minimum)
3) 2"-3" light gauge vented galvanized metal deck
4) Metal deck CAN NOT be counted on for reinforcing the slab - slab must contain sufficient reinforcing (rebar)
5) Reinforcing (rebar) must be protected (epoxy coated)
6) Total slab thickness of 5"-6"
This seems a bit excessive for a little ol' parking structure with no heavy traffic, just light weight cars and trucks for retail parking. Are these recommendations normal for this type of structure or over-kill? I've reviewed structural drawings for similar structures and very few of these recommendations applied. Anyone have any input?
Thanks!
1) Use of normal weight concrete
2) Use of 4,500 psi concrete (minimum)
3) 2"-3" light gauge vented galvanized metal deck
4) Metal deck CAN NOT be counted on for reinforcing the slab - slab must contain sufficient reinforcing (rebar)
5) Reinforcing (rebar) must be protected (epoxy coated)
6) Total slab thickness of 5"-6"
This seems a bit excessive for a little ol' parking structure with no heavy traffic, just light weight cars and trucks for retail parking. Are these recommendations normal for this type of structure or over-kill? I've reviewed structural drawings for similar structures and very few of these recommendations applied. Anyone have any input?
Thanks!





RE: Cast-in-place Conc + Steel Elevated Parking Structure
Nothing ecessive about 4500 psi normal weight concrete. - Around here (MN) you cannot buy anything less than 4000 psi or 4500 psi (air entrained) for a simple driveway. The good supliers will refuse.
Galvanized forms will not rust.
Epoxy coated bars are common wherever there is the possibility of corrosion.
The slab thickness is dictated by the span, loadings and cover.
RE: Cast-in-place Conc + Steel Elevated Parking Structure
Yes they will. Over time. Galvanizing won't last forever under wet/dry conditions.
Slab thickness is also thicker to keep tensile stresses down where cracking under service loads is kept to a minimum - thus helping to keep cracks small or non-existant and thus inhibit moisture infiltration into the slab.
RE: Cast-in-place Conc + Steel Elevated Parking Structure
I guess I should never say never either. - Thanx
Dick
RE: Cast-in-place Conc + Steel Elevated Parking Structure
Dik
RE: Cast-in-place Conc + Steel Elevated Parking Structure
RE: Cast-in-place Conc + Steel Elevated Parking Structure
Thanks for all the explanations and recommendations. As far as a sealer/proprietary topping - any suggestions?
RE: Cast-in-place Conc + Steel Elevated Parking Structure
Dik
RE: Cast-in-place Conc + Steel Elevated Parking Structure
RE: Cast-in-place Conc + Steel Elevated Parking Structure
Check this company product out:
http://www.neogard.com/
RE: Cast-in-place Conc + Steel Elevated Parking Structure
You'd be surprised how big a deal something like this can be made to sound like. And it doesn't have to be a design problem. Shoddy construction can be turned into a design issue when lawyers are involved.