sm7 76

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PROBLEM (7.76) Design the cross section of the wooden beam shown in Fig. P7.76.
Given: all
σ
= 1800 psi, all
τ
= 150 psi
SOLUTION
.50600 inlbftlbw ==
Refer to solution of Prob. 7.72.
Equation (2):
22
2
2
3 3(50)(12 12)
; , 8.485 .
4 4(6)(1800)
all wL hh
bh
σ
×
== =
in
Equation (1):
3 3(50)(144)
;6
4 4(6)(150)
all wL hi
bh
τ == .n=
n
The required depth is
8.5 .
all
hi=
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