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Structural Concrete - Hassoun

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Design and Analysis Flowcharts 983<br />

Direct Design Method<br />

Check Limitation Requirements<br />

Minimum of<br />

three continuous<br />

spans in each<br />

direction<br />

Panels<br />

must be<br />

rectangle<br />

or square<br />

L l /l s ≤ 2.0<br />

Adjacent span in<br />

each direction<br />

must not differ<br />

by more than one<br />

third the longer<br />

span<br />

Column must not<br />

offset by more than<br />

10% of span length<br />

in either axis between<br />

centerline of<br />

successive column<br />

All loads<br />

should be<br />

uniform and<br />

LL/DL < 2.0<br />

0.2 <<br />

α f1 l 2 2<br />

< 5.<br />

α f 2 l 2 1<br />

If beams r are<br />

present all sides<br />

Limitations<br />

are satisfied<br />

No<br />

DDM cannot<br />

be used<br />

Yes<br />

Slab without beams<br />

(flat plates and flat slabs)<br />

Slabs with interior and<br />

exterior beam<br />

1 2<br />

Flowchart 24.13a<br />

Two-way slab—DDM.

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