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Section 2
2-49
So the design ratio is
0.962 0.85*13.372
0 0.691
0.926
8.46
1- 19.8
1
1
154.58
'
'
my by
amxbz
a
a
a
bz
by
ez
ey
Cf
fCf
F
f
f
F
F
F
F
++ =+ +=
⎛⎞⎛⎞ ⎛ ⎞
−
⎜⎟
−
⎜⎟⎜⎟
⎜⎟
⎝⎠
⎝⎠
⎝⎠
0.962 13.372
0 0.732
0.472 0.472*36 19.8
by
abz
ybzby
f
ff
FF F
++= + +=
The value calculated by STAAD is 0.732
Member 7, Size W 16X36, L = 4 ft., a = 10.6 in
2
, Sz = 56.5 in
3
From observation Load case 3 will govern, Forces at the midspan
are
Fx = 24.05 kip (tension), Mz = 62.96 k-ft
Allowable Stress Calculation:
From Table 10.32.1A,
Bending:
Minor Axis:
Allowable minor axis bending stress:
FTY = FTZ = 0.55 x F
Y
= 19.8 ksi
Major Axis:
FCZ = 0.55xF
Y
= 19.8 ksi