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7.9 PROBLEMS
7.1 Design a W14 section made of A36 steel with
yield stress of 36 ksi for the beam-column shown in Fig. 7.16. The member
is subjected to an axial compressive load of 150 Kips. Bending about the
major axis is due to a uniformly distributed load of intensity q = 1 K/ft. Bending about the minor
axis is due to a couple of magnitude 12 K-ft applied at the midpoint C of the member. Assume lateral
support at the two ends A and B only.
7.2 The W-shape column shown in Fig. 7.17 is part
of a laterally braced frame. It is subjected to two centric axial
compressive forces of P1
and P3 at the two ends
and the force P2 with
an eccentricity of 12 in. with respect to the center of the column. The
three forces are applied in the plane of the web. In addition to the two
hinged ends A and B, the column also has lateral
support in the x-direction at
point D at a distance of 8 ft
from the top end A. The column is
made of steel with yield stress of 50 ksi. Check the adequacy of a W14x43 section for the column. Neglect the
weight of the column.
7.3 Design the moment-resisting frame shown in Fig.
7.18 using A36 steel with yield stress of 36 ksi. Lateral support is
provided at points B, C, E (midpoint of column AB),
F (midpoint of column CD), and G (midpoint of beam BC).
Select the lightest W14 for the column and the lightest W section for the
beam.
7.4 Find the lightest W12 section for the column in
Example 1 of this chapter.
7.5 Design a 12x12 tube for Example 2 of
this chapter.
7.6 Solve Problem 5.17 as a beam-column subjected
to axial compressive forces of 20 K at the two ends in addition to the
lateral vertical and horizontal loads.
7.7 Solve Problem 5.18 as a
beam-column subjected to axial compressive forces of 25 K at the two ends
in addition to the lateral vertical and horizontal loads.
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