________________________________________________________________________
PROBLEM (11.65) A square aluminum alloy 6061-T6 column of length L = 0.6 m is
pinned at both ends (Fig. P11.65). What is the smallest allowable width a if the member is to
support an axial load P = 250 kN?
SOLUTION
223
a
Aa r IA===
412Ia=
0.6 2.078
23
L
ra
a
==
a
a
Assume: 9.5 66.
e
Lr<<
Using Eq. (11.28):
36
2
250 10 2.078
[140 0.87( )]10
all aa
σ
×
==−
or 23
a,
3
a
−−
−×−×= m12.91 10 1.786 10 0 49.21am
=
.
So,
2 3 49.21 2 3 14.2ra mm== =
600 14.2 42.3 66Lr
=
=<
Our assumption was correct. Use am49.2 m
=
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