________________________________________________________________________
PROBLEM (11.64) Select the lightest wide-flange steel shape (see Table B.7) to support an
axial load of P = 1150 kN on an effective length of Le =4 m.
Given: E = 200 GPa, σy = 250 MPa.
SOLUTION
See Example 11.12: . 126
c
C=
Try: 32
6
1150 10
115 , 0.01
115 10
P
M
Pa A m
A
×
===
×
Try (Table B.8):
W250x80.
We have
3
min 4 10 65 61.54 c
Lr C=× = <
Use Eq. (11.24):
3
5 3 61.54 1 61.54
( ) 1.84
3 8 126 8 126
s
n=+ − =
62
250 10 1 61.54
[1 ( ) ] 119.7
1.84 2 126
all
M
Pa
σ
×
=−=
63
119.7 10 (10.2 10 )
all
P−
=× ×
O.K. 1221 1150kN kN=>
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