________________________________________________________________________
PROBLEM (7.32) For the beam loaded as shown in Fig. P7.31, using w = 800 kips/ ft, determine,
on a section 3 ft to the right of A:
(a) The bending stress at point E.
(b) The bending stress at point F.
SOLUTION
From solution of Prob. 7.31:
4
13.63 . 1.763 .
I
in y in==
0.763 in.
3 ft
F
O
3 f
t
4.5 f
t
800 lb/f
t
y
3 ft
z
1.763
2.237
C
5.4 kips
5.4 ki
p
s
E
0.8 6 3 5.4 3 1.8
O
M
kip ft=− × × + × = 21.6 .kip in
=
Thus,
(a) 3
21.6 10 (0.763) 1.21
13.63
E
EMc ksi
I
σ
×
== =
(b) 2.237
1.21 3.55
0.763
Fksi
σ
=− =−
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