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X2.2 Example Problem
X2.2.1 Select a Class for a concrete rectangular box to be
used as a catch basin when the invert of the base is 11 ft (3.4
m) below grade and water level is 5 ft (1.5 m) below grade.
Catch basin is in a highway.
X2.2.2 Since the catch basin is in a highway, a live load
(
LL
) from truck traffic must be considered. Refer to
Fig. X2.2
for load diagram.
X2.2.3 From
Fig. X2.2
:
h
1
5
8 ft
~
2.4 m
!
(X2.2)
h
11
5
11 ft
~
3.4 m
!
h
2
5
3 ft
~
0.91 m
!
h
22
5
6 ft
~
1.8 mm
!
P
~
1
!
5
40
3
8
1
62.4
3
3
5
507 lbf/ft
2
~
24.3 kPa
!
P
~
2
!
5
40
3
11
1
62.4
3
6
5
814 lbf/ft
2
~
38.9 kPa
!
P
5
507
1
814
2
5
660 lbf/ft
2
~
31.6 kPa
!
X2.2.4 Choose Class 700 since 700 is greater than 660. Go
to the tables with desired size to obtain information necessary
to produce the box.
X2.2.5 If P is greater than 700, the tables do not apply. An
engineer should be engaged to provide design.
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http://www.copyright.com/FIG. X2.2 Load Diagram
C913 − 08
6
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