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I want to ask about the minimum ratio of steel for mat foundation?

I want to ask about the minimum ratio of steel for mat foundation?

I want to ask about the minimum ratio of steel for mat foundation?

(OP)
HI
I want to ask about the minimum ratio of steel for mat foundation (RAFT)?
Thank you

RE: I want to ask about the minimum ratio of steel for mat foundation?

ACI-ASCER Committee 326 "Shear and Diagonal Tension" part 3, "Slabs and Footings", "ACI Journal Proceedings", Vol 59, No. 3, March 1962, pp353-396

ACI Committee 436 "Suggested Design Procedures for Combined Footings", "ACI Journal Proceedings", Vol 63, No. 10, October 1966, pp1041-1058

check ACI 10.5.3 and 7.12.2 for min steel reinforcement

RE: I want to ask about the minimum ratio of steel for mat foundation?

if you have not gone down to the library yet to look that lot up the answer you are looking for is simple. Around 0.2% minimum -  but even that can go down depending how you designed the thing to work.
Less than 0.15% is a bit mean and might lead to problems as far as crack control goes.
Thick slabs can be designed using the "marzipan" technique to cut down on % but you need to know what you are doing for that.
Hope that helps.

RE: I want to ask about the minimum ratio of steel for mat foundation?

Wopshistos:

Could you please be more specific on the meaning of 'marzipan' technique?

Thanks

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