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Structural Concrete - Hassoun

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Design and Analysis Flowcharts 977<br />

Given: b w , d, f ′ c , f y , V u<br />

Required: Shear reinforcement<br />

ϕV c = ϕ2λ f ′ c b w d<br />

ϕ = 0.75<br />

No<br />

Yes<br />

V u ≥ ϕV c /2<br />

Yes<br />

No<br />

V u > ϕV<br />

No shear<br />

c<br />

reinforcement<br />

is required<br />

V s = (V u – ϕV c )/ϕ<br />

Choose minimum<br />

shear reinforcement.<br />

A v ≥ 50b w S/f y<br />

No<br />

Yes<br />

A v = 0.75 f ′ c (b w S/f y )<br />

V s > 4V c<br />

S ≤ d/2 ≤ 24 in.<br />

Minimum stirrups<br />

no. 3 at S max<br />

A v = V s S / f y d<br />

Or<br />

S = A v f y d/V s Increase<br />

section<br />

Yes<br />

V s > 2V c<br />

No<br />

S ≤ d/4 ≤ 12 in.<br />

S ≤ d/2 ≤ 24 in.<br />

S ≤ A v f y /50b w<br />

End<br />

End<br />

Flowchart 24.7<br />

Shear design.

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