Elevated Concrete Slab Design
Elevated Concrete Slab Design
(OP)
Hello folks,
My apologies for the relatively banal question, but I'm drawing a blank. It's been a while since I've designed an elevated concrete slab and I was wondering if anyone could give me any design tips on that re-entrant corner? I'm planning on designing this to ACI 318-11 standards, and as a two-way slab.
The current draft attached was for the client as a pricing set - using a one-way slab design but it should largely illustrate the situation. It's an elevated slab over an existing garage. Any tips folks? Anything I should watch out for? For the more experienced sages in these forums, any words of caution I should carve into my memory?
Thanks,
Rod
My apologies for the relatively banal question, but I'm drawing a blank. It's been a while since I've designed an elevated concrete slab and I was wondering if anyone could give me any design tips on that re-entrant corner? I'm planning on designing this to ACI 318-11 standards, and as a two-way slab.
The current draft attached was for the client as a pricing set - using a one-way slab design but it should largely illustrate the situation. It's an elevated slab over an existing garage. Any tips folks? Anything I should watch out for? For the more experienced sages in these forums, any words of caution I should carve into my memory?
Thanks,
Rod






RE: Elevated Concrete Slab Design
I hate CAD, CAD drafters never seem to know what they are drawing. Pretty pictures, signifying nothing.
RE: Elevated Concrete Slab Design
BA
RE: Elevated Concrete Slab Design
Maine EIT, Civil/Structural.
RE: Elevated Concrete Slab Design
Sort of like establishing an "in-slab" pair of orthogonal beams to carry the load and stiffen those edges near the corner.
Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies
RE: Elevated Concrete Slab Design
Maine EIT, Civil/Structural.
RE: Elevated Concrete Slab Design
Do diagonal bars do anything more than bars in each orthogonal direction? He's already got four layers of steel.
BA
RE: Elevated Concrete Slab Design
In addition ACI recommends it and in some cases requires it. For example ACI 332 for residential construction specifies in section 7.2.10 that at re-entrant corners in walls a 24" diagonal bar shall be provided at the corners. ACI 551 for tilt-up construction also requires this as well if I recall, even if you have orthogonal bars parallel to each sides of the corner.
Some further information: http://www.concreteconstruction.net/concrete-const...
Maine EIT, Civil/Structural.
RE: Elevated Concrete Slab Design
The hidden line down the center signifies the "peak" of the slab for drainage sloping purposes, and the other dashed line at the N retaining wall is an existing, large monolithic concrete piece of an older retaining wall that is expected to remain. Basically, the slab is being supported on three sides with retaining walls and on the south side with a concrete beam with its reactions on the retaining walls.
@JAE and TehMightyEngineer - Thanks for the recommendations. Sounds good, #4/24-36" should work out nicely.
@BAretired and hokie66 - I appreciate the input.
If anything else comes to mind, I'm all ears. I'm thinking about the temporary shoring of this structure too... so I'm open to ideas outside of the standard steel soldier piles and lagging.