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Structural Concrete - Hassoun

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Design and Analysis Flowcharts 971<br />

Given: b, d, A s , f ′ c , f y<br />

Required: ϕM n<br />

Let ρ = A s /bd<br />

No<br />

ρ > ρ min<br />

(1)<br />

Yes<br />

Increase ρ<br />

Yes<br />

ρ ≤ ρ max<br />

(2)<br />

No<br />

a = A s f y /(0.85f ′ c b)<br />

c = a/β 1<br />

Reduce ρ<br />

End<br />

Flowchart 24.1<br />

Analysis of single reinforced rectangular section.<br />

√<br />

f<br />

c<br />

1. ρ min = 3<br />

′ ≥ 200<br />

f y f y<br />

2.<br />

( f<br />

′<br />

ρ b =(0.85β 1 ) c<br />

( 0.003 + fy ∕E s<br />

ρ max =<br />

0.008<br />

f y<br />

)(<br />

87<br />

87 + f y<br />

)<br />

)<br />

ρ b

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