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Structural Concrete - Hassoun

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986 Chapter 24 Design and Analysis Flowcharts<br />

2<br />

Slab with interior and<br />

exterior beams<br />

0.2≤α fm ≤ 2.0<br />

α fm ≤.2<br />

Calculate h<br />

according to ACI<br />

Table 8.3.1.1<br />

f y<br />

l n 0.8 + 200,000<br />

h = 36 + 5β (αfm<br />

≥ 5 in.<br />

– 0.2)<br />

Calculate slab thickness<br />

h mn according to<br />

ACI 8.3.1.2<br />

E cb I b<br />

α =<br />

E cs I′ s<br />

α fm = Average<br />

α fm ≥2.0<br />

h =<br />

l n<br />

f y<br />

0.8 + 200,000<br />

≥ 3 in.<br />

36 + 9β<br />

One-way<br />

shear<br />

Calculate V u at<br />

distance d<br />

from the face<br />

of column<br />

ϕV c = 2λ<br />

f′ c′ bd 0 >V u<br />

Calculate factored load<br />

W u<br />

According to ACI 22.6.5.2,<br />

V c should be smallest of three<br />

4<br />

V c = 2 + f′ c b 0 d<br />

β λ<br />

Increase depth<br />

of slab or f′ c<br />

No<br />

Check for one-way<br />

shear and two-way<br />

shear<br />

Check<br />

α s d + 2 λ f′<br />

b c b 0 d<br />

0<br />

= 4λ f′ c b 0 d<br />

If satisfied<br />

Yes<br />

Calculate static moment<br />

M 0 in both directions<br />

Two-way<br />

shear<br />

Calculate<br />

punching<br />

shear V u at<br />

distance d/2<br />

from the face<br />

of column<br />

ϕV u >V c<br />

A2<br />

B2<br />

Flowchart 24.13d<br />

Two-way slab—DDM.

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