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Structural Concrete - Hassoun

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416 Chapter 11 Members in Compression and Bending<br />

Table 11.3 Answers for Problems 11.1-11.3<br />

Answers<br />

Problem 11.1 Problem 11.2 Problem 11.3<br />

Number f ′ c (ksi) b (in.) h (in.) A s = A′ s<br />

P b<br />

e b<br />

P n<br />

(e = 6in.) P n<br />

(e = 24 in.)<br />

a 4 20 20 6 no. 10 572 17.4 1193 395<br />

b 4 14 14 4 no. 8 249 10.9 407 93<br />

c 4 24 24 8 no. 10 848 20.1 1860 696<br />

d 4 18 26 6 no. 10 698 20.6 1528 591<br />

e 4 12 18 4 no. 9 305 15.2 592 176<br />

f 4 14 18 4 no. 10 354 16.2 715 221<br />

g 5 16 16 5 no. 10 406 15.3 807 228<br />

h 5 18 18 5 no. 9 540 12.5 930 230<br />

i 5 14 20 4 no. 9 476 13.4 847 221<br />

j 5 16 22 4 no. 10 606 14.8 1140 327<br />

k 6 16 24 5 no. 10 746 16.8 1532 476<br />

l 6 14 20 4 no. 9 534 12.8 944 226<br />

11.4 (Rectangular sections with side bars) Determine the load capacity, φP n , for the column section shown<br />

in Fig. 11.32 considering all side bars when the eccentricity is e y = 8in.Usef c ′ = 4ksiandf y = 60 ksi.<br />

(Answer: 658 K.)<br />

12 no. 10<br />

bars<br />

Figure 11.32 Problem 11.4.<br />

11.5 Repeat Problem 11.4 with Fig. 11.33. (Answer: 660 K.)

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