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Structural Concrete - Hassoun

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Design and Analysis Flowcharts 987<br />

A2<br />

B2<br />

If panel is interior, M 0<br />

shall be distributed for both<br />

directions AS<br />

M n = 0.65M 0 , M p = 0.35M 0<br />

(ACI 8.10.4.1)<br />

If panel is exterior M 0<br />

shall be distributed<br />

(ACI 8.10.4.2)<br />

For distribution of panel moments in the transverse direction, calculate α (l 2 /l 1 ), α = E cbI b<br />

E cs I s<br />

Column strip shall be<br />

proportioned to resist<br />

% of interior negative<br />

moment (ACI 8.10.5.1)<br />

Middle strip shall be<br />

proportioned to resist (100<br />

– column strip proportion<br />

% of interior negative<br />

moment)<br />

Column strip shall be<br />

proportioned to resist<br />

% exterior negative<br />

moment (ACI 8.10.5.2)<br />

Middle strip shall be<br />

proportioned to resist<br />

(100 – column strip<br />

proportion % of exterior<br />

negative moment)<br />

Column strip shall be<br />

proportioned to resist % of<br />

interior positive moment<br />

(ACI 8.10.5.5)<br />

Middle strip shall be<br />

proportioned to resist<br />

(100 – column<br />

strip proportion<br />

% of interior positive<br />

moment)<br />

Column strip shall be<br />

proportioned to resist<br />

% of exterior positive<br />

moment (ACI 8.10.5.2)<br />

Middle strip shall be<br />

proportioned to resist<br />

(100 – column strip<br />

proportion % of exterior<br />

positive moment)<br />

α (l 2 /l 1 ) > 1.0, 85% of the moments in column strip is assigned to bean, 15% to slab in column strip<br />

R u = M u<br />

bd 2<br />

d = depth of slab, b = width<br />

of strip<br />

A S = ρbd<br />

Spacing ≤ 2h s or 18 in.<br />

whichever is smaller<br />

Flowchart 24.13e<br />

Two-way slab—DDM.

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