Solution 5.5-9
Beam in an oil-well pump
SECTION 5.5
Normal Stresses in Beams
293
L
14 ft
P
8.8 k
b
8.0 in.
h
20.0 in.
t
f
0.875 in.
t
w
0.625 in.
h
1
h
2
t
f
18.25 in.
b
1
b
t
w
7.375 in.
M
max
PL
(8.8 k)(14 ft)
123,200 lb-ft
1,478,400 lb-in.
5,333.3 in.
4
3,735.7 in.
4
1,597.7 in.
4
9250 psi
9.25 ksi
s
max
M
max
c
I
(1.4784
10
6
lb-in.)(10.0 in.)
1,597.7 in.
4
1
12
(8.0 in.)(20.0 in.)
3
1
12
(7.375 in.)(18.25 in.)
3
I
bh
3
12
b
1
h
1
3
12
s
max
M
max
c
I
c
h
2
10.0 in.
b
t
f
h
1
h
2
t
w
L
P
Problem 5.5-10
A railroad tie (or
sleeper
) is subjected to two rail
loads, each of magnitude
P
175 kN, acting as shown in the figure.
The reaction
q
of the ballast is assumed to be uniformly distributed
over the length of the tie, which has cross-sectional dimensions
b
300 mm and
h
250 mm.
Calculate the maximum bending stress
max
in the tie due to
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- Spring '08
- Armanios
- Rail tracks, G protein coupled receptors, maximum bending stress
-
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