ACI 360 slab on grade crack control reinforcement
ACI 360 slab on grade crack control reinforcement
(OP)
I am working on an industrial floor slab design that will also serve as liquid containment during equipment washdowns. The slab has been designed as non-reinforced for non-uniform distributed loading and wheel loads per ACI 360. I would like to extend the distance between contraction joints (beyond the 36 to 24 times slab thickness graph) to reduce the number of joints that will need to be sealed. I noticed that ACI 360 offers up using 5% steel reinforcement to eliminate contraction joints. Is there anyway to estimate the steel I would need to double the joint distance (for unreinforced slabs) without providing the full 5% to eliminate the joints?
Thanks in advance,
Tom
Thanks in advance,
Tom






RE: ACI 360 slab on grade crack control reinforcement
As = (F*L*w)/(2*fs)
As = area of steel required
F = 1.5
L = length between control joints, feet
w = weight of slab, psf
fs = allowable steel stress = 0.67*fy
DaveAtkins
RE: ACI 360 slab on grade crack control reinforcement
RE: ACI 360 slab on grade crack control reinforcement
RE: ACI 360 slab on grade crack control reinforcement
DaveAtkins
RE: ACI 360 slab on grade crack control reinforcement
RE: ACI 360 slab on grade crack control reinforcement
Dik
RE: ACI 360 slab on grade crack control reinforcement
Using ACI 318 minimum of 0.18% the subgrade drag formula tells me that I can space my free joints at 90ft intervals. That seems pretty far, but I assume I can space them at 30ft to 40 ft without large random cracks.
Thanks,
Tom