two-way slab reinforcement notation on drawings

[cmbyrd77]

I just wanted to pick some of the brilliant minds on here as to the best way to call out two-way slab reinforcement on drawings. I've seen hatching done with a schedule, I've seen it all done via details, and I've seen it done with plan notes. Any advice on the best way. I'm hoping there are some concrete contractors/ironworkers that can also chime in.

Any advice would help. I'm all

Thank you.

 

[TDIengineer]

For a 2 way slab with middle and column strips, I believe I have seen the quantity of bars identified on plan for that strip width. A basic note identifies which reinforcing is toward the outside layer (e.g. N-S reinforcing placed to the outside, TOP and BOTT). Then make sure your details have the outside vs inside layer of reinforcing shown consistent with your plan note. Where laps occur, a single bar is shown in that middle or column strip region identifying the lap location and length.

So, within each strip 2 bars are shown in the given direction, it is labeled T or B, and the quantity of bars is identified with size. I have also seen where if the plan is complicated, 2 plans are created showing top reinforcing on one plan, and bottom on the other.

I wish I had some of my older existing drawings available that I could scan and share the plan linework and set up. Picture is worth a thousand words. And the drafters from the 70's that did tons of 2 way slabs were really good at it.

Anyway, I let some others pick apart my post.

 

[hokie66]

It is best to have separate plans for top and bottom reinforcement.