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Structural Concrete - Hassoun

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338 Chapter 9 One-Way Slabs<br />

The moment capacity of the flange is greater than the applied moment; thus, the rib acts as<br />

a rectangular section with b = 24 in., and the depth of the equivalent compressive block a is less<br />

than 2 in.<br />

(<br />

φM n = φA s f y d − a ) (<br />

= φA<br />

2 s f y d −<br />

A s f )<br />

y<br />

1.7f c ′ b<br />

(<br />

259.4 = 0.9A s × 60 10.9 − A s × 60 )<br />

A<br />

1.7 × 4 × 24 s = 0.45 in. 2<br />

a =<br />

A s f y<br />

0.85 × f c ′ = 0.33 in.

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