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Structural Concrete - Hassoun

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Design and Analysis Flowcharts 973<br />

No<br />

A s ≤ A s, max<br />

(1)<br />

Yes<br />

Reduce A s<br />

Yes<br />

A s ≥ A s, min<br />

(2)<br />

No<br />

For T-section, b e is the smallest value of: Span/4 or center to<br />

center of adjacent slabs or (b w + 16t); t = slab thickness.<br />

For L-section, b e is the smallest value of: Span/12 or half clear<br />

distance to next web + web width or (b w + 6t); t = slab thickness<br />

Increase A s<br />

Let a′ = A s f y /(0.85 f′ c b e )<br />

No<br />

Yes<br />

Enlarge<br />

section<br />

Yes<br />

a′ ≤ t<br />

No<br />

T-section analysis<br />

Rectangular analysis<br />

a = a′<br />

End<br />

End<br />

Flowchart 24.3<br />

Analysis of T- and L-sections.<br />

( f<br />

′<br />

1. A s,max = 0.6375 c<br />

[t(b − b w )+0.375b w β 1 d]<br />

[ √ 3 f<br />

] [ ]<br />

′<br />

2. A s,min = c<br />

b<br />

f w d ≥ 200<br />

b<br />

y f w d<br />

y<br />

f y<br />

)

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