TM 5-852-4/AFM 88-19, Chap. 4
Table 4-9. Stress Distribution Beneath the Uniformly Loaded Area.
Loaded Area.
a. Under center, b=15 ft.
z
2
Depth below
b
f(m,n)
Stress, T/ft
2
footing, ft
z
from chart
az = 4xf(m,n) x 2T/ft
60
0.25
0.027
0.22
50
0.30
0.038
0.30
42.8
0.35
0.048
0.38
37.5
o.40
0.06
0.48
33.3
0.45
0.072
0.58
30.0
0.5
0.084
0.67
20.0
0.75
0.136
1.09
15.0
1.0
0.175
1.40
10.0
1.5
0.216
1.73
7.5
2.0
0.232
1.86
6.0
2.5
0.24
1.92
4.28
3.5
0.245
1.96
3.75
4.0
0. 247
2.00
b. Under corner, b=30 ft.
z
2
Depth below
b
f(m,n)
Stress, T/ft
2
footing, ft
z
from chart
az = 4xf(m,n) x 2T/ft
60
0.5
0.085
0.17
50
o.6
0.107
0.21
42.8
0.7
0.128
0.25
37.5
0.8
0.146
0.29
33.3
0.9
0.162
0.32
30.0
1.0
0.175
0.35
20.0
1.5
0.216
0.43
15.0
2.0
0.232
0.46
10.0
3.0
0.244
0.49
7.5
4.0
0.247
o.49
6.0
5.0
0.248
0.50
4.28
7.0
0.250
0.50
3.75
8.0
0.250
0.50
U. S. Army Corps of Engineers
4-108
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