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Structural Concrete - Hassoun

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Problems 355<br />

Number<br />

f ′ c<br />

(ksi)<br />

P D<br />

(K)<br />

P L<br />

(K) ρ g<br />

% Section One Solution<br />

a 4 200 200 4 Square 14 × 14, 8 no. 9<br />

b 4 750 400 3.5 Square 24 × 24, 16 no. 10<br />

c 4 220 165 7 Square 12 × 12, 8 no. 10<br />

d 5 330 230 3 Square 16 × 16, 8 no. 9<br />

e 4 190 170 2 Rectangular, b = 12 in. 12 × 18, 6 no. 8<br />

f 4 280 315 4.5 Rectangular, b = 14 in. 14 × 20, 10 no. 10<br />

g 4 210 150 3 Rectangular, b = 12 in. 12 × 16, 6 no. 9<br />

h 5 690 460 2 Rectangular, b = 18 in. 18 × 32, 8 no. 10<br />

i 4 350 130 4 Circular—spiral 16, 7 no. 9<br />

j 4 475 220 3.25 Circular—spiral 20, 7 no. 10<br />

k 4 400 260 5 Circular—spiral 18, 9 no. 10<br />

l 5 285 200 4.25 Circular—spiral 15, 6 no. 10<br />

For SI units, use 1 psi = 0.0069 MPa, 1 K = 4.45 kN, and 1 in. = 25.4 mm.

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