________________________________________________________________________
PROBLEM (11.67) A rectangular aluminum alloy 6061-T6 tube of the cross section
shown in Fig. P11.67 is used as a column of 5-m effective length. What is the largest permissible
axial load P?
SOLUTION
32
200 100 160 60 10.4 10Am=×−×= × m
33
min 1(200 100 160 60 )
12
I=×−× 64
13.79 10 mm=×
min min 36.4rIA m==m, 3
min 5 10 36.4 137.4
e
Lr =× =
Use Eq. (11.29):
9
2
350 10 18.54
(137.4)
all
M
Pa
σ
×
==
63
18.54 10 (10.4 10 )
all
P−
=× × 192.8 kN
=
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