________________________________________________________________________
PROBLEM (7.77) Determine the depth h needed in the rectangular beam loaded as seen in
Fig. P7.77.
Given: all
σ
= 10 MPa, all
τ
= 600 kPa, b = 150 mm
SOLUTION
From solution of Prob. 7.25:
mkNMkNV
⋅
=
=23.136.12 maxmax
Thus,
3
6
232
6 6(13.23 10 )
; 10 10 , 230
(150 10 )
all Mhm
bh h
σ
−
×
=×= =
×m
3
33
3 3(12.6 10 )
; 600 10 , 210
2 2(150 10 )
all Vhm
bh h
τ
−
×
=×= =
×m
The required depth is
mmhall 230=
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