UFC 3-260-03
15 Apr 01
Design Factor1
Allowable Gross Weight 1,000 kg (Kips)3
Load Factor2
Pass
Type A
Type B and
Type A
Type B
Type C
Levels
Traffic
C Traffic
1,000 kg (Kips)
Traffic
Traffic
Traffic
100
0.578
0.553
181(400)
313(690)
329(725)
438(965)
500
0.752
0.728
181(400)
240(530)
250(550)
333(735)
3,000
0.946
0.922
181(400)
193(425)
197(435)
263(580)
15,000
1.120
1.099
181(400)
163(360)
166(365)
220(485)
1
From figure 6-54.
2
From figure 6-18.
3
Divide load factor by design factor for type A and B traffic areas. For type C traffic area, multiply
allowable load for type B traffic by 1.33.
(b) Problem 2. Determine the standard evaluation for Air Force Group 14, using the
above conditions, in terms of allowable passes. The allowable number of passes for several gross
weights are determined as shown in the following tabulation:
Design Factor4
Allowable Passes5
Weight
Aircraft Gross
Load
Traffic
Weight 1,000 kg
Traffic Area C 1,000 kg (Kips) Area A
Traffic Traffic
Traffic
Traffic
(Kips)1
1,000 kg (Kips)2
Factor3
and B
Area C Area A
Area B
Area C
218(480)
163(360)
181(400)
0.833
1.111
90
110
1,400
200(440)
150(330)
181(400)
0.909
1.212
170
235
3,810
181(400)
136(300)
181(400)
1.000
1.333
400
541
11,630
163(360)
122(270)
181(400)
1.111
1.481
1,105
1,502
45,515
136(300)
102(225)
181(400)
1.333
1.777
8,550
11,630
697,150
1
Gross weight for which the evaluation is being made.
2
Weight to be used in evaluating type C traffic areas is the aircraft gross weight times 0.75.
3
From figure 6-18.
4
Load factor divided by aircraft weight.
5
From figure 6-36.
f.
Navy and Marine Corps Evaluation Example for Plain Concrete.
(1)
Airfield runway having a uniform thickness of 229 millimeters (9 inches).
(2)
Concrete flexural strength of 4.8 MPa (700 psi).
(3)
Subgrade modulus of reaction of 81 kPa/mm (300 pci).
(4)
100,000 passes.
(5)
Condition of pavement is excellent.
6-5