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Structural Concrete - Hassoun

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Design and Analysis Flowcharts 979<br />

Given: b, d, d′, A s , A′ s , f ′ c , f y<br />

Required: P b , M b , e b<br />

c b = 87d/(87 + f y )<br />

a b = β 1 c b<br />

f ′ s = [87(c b – d′)/c b ]<br />

f ′ s ≤ f y (ksi)<br />

C s = A′ s ( f′ s – 0.85f ′ c )<br />

C c = 0.85f ′ c ab<br />

T = A s f y<br />

P b = C c + C s – T<br />

M b = C c (d – a b /2 – d″) + C s (d – d″ – d″) + Td″<br />

e b = M b /P b<br />

End<br />

Flowchart 24.9 Balanced load, moment, and eccentricity for rectangular column<br />

sections. (Use ksi for f<br />

c ′ and f y ; d′′ = distance from the plastic centroid to A s<br />

.)

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