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Stem Wall/Slab Detailing

Stem Wall/Slab Detailing

Stem Wall/Slab Detailing

Hi, I have a project where an elevated concrete slab for a new cmu electrical building is under construction. The slab is elevated a few feet above grade due to the flood level and is supported by a concrete stem wall with strip footings around the perimeter. Both the slab and the stem wall are 12" thick with double layers of reinforcement. Where the slab frames into the stem wall the horizontal rebar in the slab ends in 90-degree standard hooks and the vertical reinforcement in the stem wall also ends in 90-degree standard hooks. This is a detail I've seen typically however someone mentioned that the vertical reinforcement in the stem wall at the outside face should splice the top layer of reinforcement in the slab (negative reinforcement). Because I've never seen this I'm not sure if it's overkill. What do people typically do in this situation?

RE: Stem Wall/Slab Detailing

You always want to terminate your reinforcing on the far face/surface. Rebar is for tension, and, if you terminate reinforcing from the inside face to the nearest concrete surface over it, your 90deg corner can spall the concrete off.


RE: Stem Wall/Slab Detailing

I always splice the wall reinforcement into the slab to get continuity in the corner.

RE: Stem Wall/Slab Detailing


Quote (dik)

The rebar would be spliced on the opposite face. I've attached a pdf I threw together real quick to show what I'm talking about.

Quote (avscorreia)

I'm unsure of how that would help? I've always considered the joint between the slab/wall (shaded area in my sketch) as a fixed point so that as long as the rebar in the slab/wall is developed at the interface then I'm good. if the force is in the top mat is transferred to the spliced bar I don't see how it can 'turn the corner' into the stem wall rebar?

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