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Structural Concrete - Hassoun

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Summary 721<br />

3. Calculate the reinforcement required at midspan section: Forh = 6in.,d = 6–1.0 = 5.0 in.,<br />

R u = M u 92.8 × 1000<br />

= = 309psi<br />

2<br />

bd 12(5.0) 2<br />

For f c ′ = 3ksi, f y = 60 ksi, and R u = 309 psi, the steel ratio is ρ = 0.0061

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