Minimum horizontal reinforcement wall (ACI 318R-14, table 11.6.1)

[ferrarialberto]

Hi to all,
I would need to know if the limit of 0.2% indicated in table 11.6.1 of ACI 318-14 for horizontal reinforcements wall (1st row, cast in place, deformed bars, bar size <#5, fy>60 kpsi) is relative to each of two side of wall or if this limit is relative to total (then 0.1% for each side).

Thanks in advance.

ing. FERRARI Alberto -

http://www.ferrarialberto.it

 

[PSEPK]

Refer to section 11.7.2.3 of the code, for details.

A good structural engineer is often a blessing for others.

 

[ferrarialberto]

Thank you PSEPK.
I had already read the 11.7.2.3 section, but no clarification about 0.2% limit is present (are presents only detailing rules for walls with thickness major than 10").
Can you explain to me if required horizontal reinforcement is 0.1% for each face of wall (then 2x0.1%) or 0.2% for each one face of wall (then 2x0.2%)?

Thank you.

ing. FERRARI Alberto -

http://www.ferrarialberto.it

 

[JAE]

Can you explain to me if required horizontal reinforcement is 0.1% for each face of wall (then 2x0.1%) or 0.2% for each one face of wall (then 2x0.2%)?

The variable ρt is the ratio of area of steel to area of concrete (As / Ac)
If you are looking at a face of wall then your area is half that of the full wall.
If you look at the whole wall then your area is that of the full wall.

So if your wall is 12" thick your area per foot is 12 x 12 = 144 sq. in. Your required area of steel on the full wall is 0.002 x 144 = 0.288 sq. in.
Putting 1/2 on each face you would need 0.288/2 = 0.144 sq. in. per face.

If you look at a face only condition - then 0.002 x 6" x 12" = 0.144 sq. in. The same answer for each face.





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[ferrarialberto]

Thank you JAE,
now is clear.

ing. FERRARI Alberto -

http://www.ferrarialberto.it

 

[Leftwow]

^ Huge JAE fan. Assuming that JAE means "just an engineer?".

Back to topic, isn't that 2% ratio the amount needed for shrinkage?