Typical gross rebar to concrete ratios in flat plate slabs

[JNEnginr]

Hey everyone,

Just wondering, does anyone have typical steel rebar to concrete ratios that they try to adhere to? For example, a flat plate slab that is 12" thick, if your rebar came out to "x" tons and your surface area of concrete came out to "y", you'd have "z" tons/sq ft. Any typical values people try to meet? It would vary if your slab was say 14", or say if your slab was a transfer slab. But I'm just wondering if there is any sort of common ratio that happens. I have two different transfers slabs that have the same amount of stories above (4), same thickness (14), and got a ratio of 0.004 tons/sq ft.

Any thoughts on this?

Thanks!

 

[Ingenuity]

EDIT: Sorry, I misread your post. Deleted my content as it was not relevant.

 

[dik]

For estimating, I often use 150 lbs/yd, which is a little less than 0.004 tons/ft2. This is for normal flat slabs, not plates, so, 150 might be bumped up to 175 lbs/yd which is equivalent to 0.0038 tons/ft2 (too close). You're not likely far off. Usually for estimating, I break things down to lbs/yd... footings, slabs, walls, columns, beams, etc. have equivalent lbs/yd and it doesn't change much for regular construction. That includes laps, splices, etc.

Dik