Practice Question: Minimum Area of Flexural Reinforcement For Non-prestressed Two Way Slab

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Solution

According to ACI-318, 

For fy ≥ 60 ksi, minimum area of reinforcement for nonprestressed two way slab must be greater of:

\[A_{s,min}=\frac {(0.0018)( 60,000)}{f_y}  A_g\]\[OR\]\[A_{s,min}=0.0014\ A_g\]Gross Area:\[A_g=(20)(12) (6)\]\[A_g=1440\ in^2\]Minimium reinforcement:

\[A_{s,min}=\frac{(0.0018)(60,000)}{70,000} (1440)=2.22\ in^2\]\[OR\]\[A_{s,min}=0.0014 (1440)=2.02\ in^2\]
Accordingly, minimum reinforcement area is:
\[A_{s,min}=2.22\ in^2\]

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