UFC 3-260-02
30 June 2001
Table 12-1
Example of Mixed Traffic Design
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Gross
Allowable
Column 5
Column 3
Weight,
Aircraft
Preliminary
Passes at
Divided by
Divided by
Aircraft
kg (kips)
Passes
Thickness, in.
14.3 in.
10,000
Column 6
B-52
181,400
300
14.2
336
0.03
10,000
(400)
C-141
156,490
10,000
14.3
10,000
1.00
10,000
(345)
C-130
70,310
5,000
9.3
53,000,000
5,300
1
(155)
F-15
30,840
100,000
12.2
7,800,000
780
128
(68)
OV-1
8,160
1,000,000
6.0
Unlimited
--
--
(18)
Total
20,129
Passes on Basis
of C-141 Aircraft
Conversion Factors:
Millimeters = 25.4 inches
6.
THICKNESS DESIGN - NAVY AND MARINE CORPS PAVEMENTS.
a. General. Figures 12-19 to 12-23 are design curves for various aircraft to be used in determining
thickness requirements for individual aircraft. Figures 12-24 to 12-28 are design curves to be used for
mixed aircraft traffic in determining thickness requirements. Thicknesses may also be determined using
the computer program DESIGN OF RIGID AIRFIELD PAVEMENTS. See paragraph 8 in Chapter 4 for
design policy.
b. Fatigue Damage. Repeated aircraft loading results in fatigue damage in the concrete slabs
which results in microcracks at the bottom of the slab. These cracks work their way to the surface of the
slab, eventually dividing the slab into two or more pieces. In addition, if pumping and loss of support
occur at slab corners, the critical stress could increase until a corner break develops. As the proportion
of cracked slabs increases, the airfield pavement requires increasing maintenance and repair.
c. Structural Characterization. The slab and foundation are characterized using the Westergaard
theory of a slab loaded at the interior resting on a uniformly supported foundation (as modeled using the
k value). Stresses may be computed using the computer program RPDESIGN. A major design
assumption is that adequate load transfer is provided at the joints so that the load stresses that occur at
the joints are not significantly higher than the stresses at the interior of the slab. Adequate load transfer
12-6
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