Structural Concrete - Hassoun

Problems 419
11.12 Repeat Problem 11.10 for Fig. 11.38.
10 no. 10 bars
11.13 Repeat Problem 11.11 for Fig. 11.39.
Figure 11.38 Problem 11.12.
12 no. 9 bars
Figure 11.39 Problem 11.13.
11.14 (Circular columns) Determine the load capacity, φP n , for the circular tied column sections shown in
Figs. 11.36 through 11.39 when the eccentricity is e y = 6in.Usef c ′ = 4ksiandf y = 60 ksi.
11.15 (Biaxial bending) Determine the load capacity, P n , for the column sections shown in Figs. 11.32 through
11.35 if e y = 8in.ande x = 6 ini. using the Bresler reciprocal method. Use f c ′(4ksi) and f y = 60 ksi. For
each problem the values of P nx , P ny , P n0
(P bx , M bx ), and (P by , M by ) are as follows:
a. Figure 11.32: 952 K, 835 K, 2168 K (571 K, 792 K ⋅ ft), (536 K, 483 K ⋅ ft).
b. Figure 11.33: 930 K, 1108 K, 2505 K (577 K, 742 K ⋅ ft), (577 K, 742 K ⋅ ft).
c. Figure 11.34: 558 K, 495 K, 1408 K (408 K, 414 K ⋅ ft), (368 K, 260 K ⋅ ft).
d. Figure 11.35: 1093 K, 1145 K, 2538 K (718 K, 865 K ⋅ ft), (701 K, 699 K.ft).
11.16 Repeat Problem 11.15 using the Parme method.
11.17 Repeat Problem 11.15 using the Hsu method.
11.18 For the column sections shown in Fig. 11.32, determine
a. The uniaxial load capacities about the x and y axes, P nx and P ny using e y = 6in.ande x = 6in.
b. The uniaxial balanced load and moment capacities about the x and y axes, P bx , P by , M bx ,andM by .
c. The axial load, P n0
.
d. The biaxial load capacity P n when e y = e x = 6 in., using the Bresler reciprocal method, the Hsu
method, or both.
11.19 Repeat Problem 11.18 for Fig. 11.33.
11.20 Repeat Problem 11.18 for Fig. 11.34.
11.21 Repeat Problem 11.18 for Fig. 11.35.