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ARCH 614. Assignment #9
Problems: all but 9A from Ambrose & Tripeny, Chapter 10, pgs 353, 356, 362, 364, 366, & 237.
Note: Problems marked with a * have been altered with respect to the problem stated in the text.
Problem 10.3.A. USE US UNITS. Determine the maximum factored axial compression load
(Pu) for a W 10 x 49 column with an unbraced height of 15 ft [4.57 m] of A36 steel. Assume
K = 1.0. (LRFD column analysis)
Partial answers to check with: 358 kips
Problem 10.3.B*. USE US UNITS. Determine the maximum factored axial compression load
(Pu) for a W 12 x 120 column with an unbraced height of 22 ft [6.71 m] of A992 steel (Fy = 50
ksi), if both ends are fixed against rotation and horizontal movement. Use the theoretical K
value as well as the recommended design value when ideal conditions are approximated.
(LRFD column analysis)
Partial answers to check with: 1395 kips (theoretical) 1274 kips (design)
Problem 10.3.C. USE US UNITS. Determine the maximum
factored axial compression load (Pu) in Problem 10.3.A if the
conditions are as shown in Figure 10.5 with L1 = 15 ft [4.6 m]
and L2 = 8 ft [2.44 m]. (LRFD column analysis)
Partial answers to check with: 426 kips (text answer is
wrong!)
Problem 10.4.C.* USE US UNITS. Select a column section
using the same data as in Problem 10.4.A (using table 10.2 with
A36 steel and A992 steel, Fy = 50 ksi with K=1.0) except the
dead load is 142 kips [6327 kN] and the live load of 213 kips
[947 kN] . The unbraced height about the x-axes is 20 ft [6.1
m] and about the y-axis is 10 ft [3.05 m] 20 ft.
(LRFD column design)
Partial answers to check with: W 12 x79 (A36:
Pn = 512k A992:
Pn = 627k)
Problem 10.4.G. Select the minimum size standard weight steel pipe column for an axial dead
load of 20 kips, a live load of 30 kips, and the following unbraced height: 18 ft. (LRFD
column design)
Problem 10.4.K. USE US UNITS. Using Table 10.5, select the lightest tubing column to carry
an axial dead load of 30 kips [133 kN] and a live load of 34 kips [151 kN] if the effective
unbraced length is 10 ft [3.05 m]. (LRFD column design)
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