Page 335 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities

SITE UTILITY SYSTEMS

SITE UTILITY SYSTEMS 6.57

TABLE 6.12 Surface Load Factor—One or Two Trucks on Rigid Pavement *

Pavement thickness, in †
One truck Two passing trucks
Depth
of cover,
ft ‡ 4 6 8 10 4 6 8 10

2 0.0244 0.0149 0.0101 0.0076 0.0410 0.0263 0.0186 0.0142
2 1/2 0.0213 0.0139 0.0097 0.0072 0.0364 0.0246 0.0177 0.0136
3 0.0186 0.0126 0.0090 0.0070 0.0333 0.0228 0.1067 0.0129
3 1/2 0.0164 0.0114 0.0085 0.0066 0.0290 0.0206 0.0156 0.0122
4 0.0144 0.0102 0.0079 0.0061 0.0262 0.0187 0.0146 0.0117
5 0.0114 0.0084 0.0066 0.0054 0.0210 0.0156 0.0123 0.0102
6 0.0093 0.0071 0.0057 0.0047 0.0170 0.0133 0.0107 0.0088
8 0.0065 0.0052 0.0043 0.0036 0.0114 0.0097 0.0081 0.0069
10 0.0046 0.0039 0.0033 0.0029 0.0080 0.0070 0.0062 0.0055
12 0.0034 0.0030 0.0026 0.0023 0.0059 0.0054 0.0049 0.0045
16 0.0022 0.0019 0.0017 0.0016 0.0034 0.0032 0.0030 0.0028
20 0.0013 0.0011 0.0010 0.0009 0.0024 0.0023 0.0022 0.0021
24 0.0008 0.0007 0.0006 0.0005 0.0015 0.0014 0.0013 0.0012
* These factors were computed by the methods explained in “Vertical Pressure on Culverts under Wheel Loads on
Concrete Pavement Slabs,” Portland Cement Assn., Chicago, IL, in Bulletin ST65.
† 1 in = 25 mm.
‡ 1 ft = 0.3 m.
Source: ANSI 21.1.

TABLE 6.13 Reduction Factor
Depth of cover, ft *

Pipe size, in 2 1/2 − 3 1/2 4−7 8−10 >10
3–12 1.00 1.00 1.00 1.00
14 0.92 1.00 1.00 1.00
16 0.88 0.95 1.00 1.00
18 0.85 0.90 1.00 1.00
20 0.83 0.90 0.95 1.00
24–30 0.81 0.85 0.95 1.00
36–60 0.80 0.85 0.90 1.00
* 1 ft = 0.3 m.
Source: ANSI 21.1.

TABLE 6.14 Truck Wheel Load
AASHTO truck Gross weight, tons Wheel load (P), lb *
H-10 10 8,000
H-15 15 12,000
H-20 20 16,000
*
1 lb = 2.2 kg.

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