________________________________________________________________________
PROBLEM (7.74) A simple wooden beam is subjected to a uniform load of intensity w as
shown in Fig. P7.74. Calculate:
(a) The maximum permissible length L.
(b) The largest allowable distributed load w.
Given: all
σ
= 8.4 MPa, all
τ
= 1.2 MPa
SOLUTION
(a) Refer to Solution of Prob. 7.72.
Equation (3):
8.4
0.15( ) 1.05
1.2
all
all
Lh m
σ
τ
== =
(b) Equation (1):
6
4 4 0.05 0.15(1.2 10 )
3 3 1.05
all all
bh
wL
τ
×
== × mkN43.11
=
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