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American Steel Design
Section 2
2-52
22
2 2 *29000
126.099
36
c
y
E
C
F
ππ
== =
As (KL/r)
y <
C
c
, the allowable axial stress in compression
()
()
2
2
22
68.57 36
36
1 1 14.47
. . 4 2.12 4 29000
yy
a
FKLrF
F
FS E
ππ
⎡⎤
⎡⎤
⎢⎥
=− =− =
⎢⎥
⎢⎥
⎢⎥
⎣⎦
⎣⎦
k
si
Actual Stress Calculation:
Actual stress (f
a
) = 48.44 /3.61 = 13.42 ksi.
Ratio
13.42
0.927
14.47
a
a
f
F
==
The value calculated by STAAD is 0.928