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American Steel Design
Section 2
2-42
() ()
22
22
*29000
263.18
. . 2.12 22.648
ez
E
F
FS KLr
ππ
== =
From table 10-36A, C
mz
= 0.85
So the design ratio is
Equation 10-42
2.024 0.85* 21.467
0 1.069
2.024
14.387
1- 19.8
1
1
263.209
'
'
my by
amxbz
a
a
a
bz
by
ez
ey
Cf
fCf
F
f
f
F
F
F
F
++ =+ +=
⎛⎞⎛⎞ ⎛ ⎞
−
⎜⎟
−
⎜⎟⎜⎟
⎜⎟
⎝⎠
⎝⎠
⎝⎠
for the end section, Equation 10-43
2.024 21.467
0 1.203
0.472 0.472 * 36 19.8
by
abz
ybzby
f
ff
FF F
++= + +=
The value calculated by STAAD is 1.204
Member 4, Size W 14X43, L = 4 ft., a = 12.6 in
2
, Sz = 62.7 in
3
From observation Load case 3 will govern, Forces at the end are
Fx = 8.75 kip (tension), Mz = 112.17 k-ft
Allowable Stress Calculation:
From Table 10.32.1A,
Bending:
Minor Axis:
Allowable minor axis bending stress: