UFC 3-260-02
30 June 2001
Table 19-4
Computation of Cumulative Damage for Selected Pavement Sections, Stabilized Bases, and
C-130 Aircraft
PCC
Base
Maximum
Design
Allowable
Passes1
Damage
Thickness, in.
Thickness, in.
Stress, psi
Passes
(5)
(6) = (4)/(5)
(1)
(2)
(3)
(4)
13
6
338
200,000
22,008
9.09
14
6
305
200,000
75,689
2.64
15
6
276
200,000
276,198
0.72
16
6
252
200,000
1,073,564
0.19
13
18
313
200,000
54,498
3.67
14
18
285
200,000
179,847
1.11
15
18
261
200,000
635,265
0.31
16
18
239
200,000
2,403,285
0.08
1
Allowable passes are computed using equations 19-1, 19-2, and 19-3 based on the computed
maximum stress shown in column (3), on a selected value of R, and the pass-to-coverage ratio for the
C-130 aircraft.
Conversion Factors: Millimeters = 25.4 inches, Megapascals = 0.006894 psi
Table 19-5
Characteristics of Design Aircraft
Pass-to-
Wheel
Wheel
Tire Contact
Coverage
Spacing,
Load,
Area,
Ratio
Gear Type
m (in.)
kg (lb)
sq m (sq in.)
Aircraft
C-141
3.50
Twin-Tandem
0.831.22
17,605 (38,812)
0.134 (208)
(32.548)
B-52
1.58
Twin-Twin
0.941.570.94
23,590 (52,000)
0.172 (267)
Bicycle
(376237)
F-15
9.34
Single
N/A
13,880 (30,600)
0.06 (87)
C-17
1.37
Triple-Tandem
(43 x 43) x 97
19,700 (43,300)
0.242 (314)
thicknesses under each of the four different aircraft are presented in Table 19-6. The total damage
induced by the mixed traffic for different PCC thicknesses are tabulated in Table 19-7. The total damage
is the sum of the damage caused by all the design aircraft.
b. Selection of Concrete Thickness. The results between the PCC thickness and damage
presented in Table 19-7 are plotted in Figure 19-9, and the required slab thickness corresponding to a
damage of 1 is determined as 470 millimeters (18.5 inches). Results in Table 19-7 indicate that for
19-14
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