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Structural Concrete - Hassoun

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974 Chapter 24 Design and Analysis Flowcharts<br />

Given: M u , f ′ c , f y<br />

Required: A s<br />

Yes<br />

b and d are given<br />

No<br />

Calculate<br />

Assume b (12-20) in.<br />

R u = M u /(bd 2 )<br />

Or d / b 2<br />

ρ = 0.85f c ′<br />

f y<br />

A s =ρ bd<br />

No<br />

Yes<br />

Change section<br />

d = M u /R u b<br />

A s =ρbd<br />

Choose bars<br />

h = d + 2.5 in. (one row of bars)<br />

h = d + 3.5 in. (two rows of bars)<br />

Round h to the next higher inch.<br />

End<br />

Flowchart 24.4<br />

Design of single reinforced rectangular section.<br />

1. Refer to Flowchart 24.1 to calculate ρ min and ρ max .

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