UFC 3-260-02
30 June 2001
Table 11-8
Data File for Computing Subgrade Damage for Pavement Thicknesses of 840, 760, and
685 millimeters (33, 30, and 27 inches)
List SDATA1
100
Taxiway design subgrade damage thickness = 33 inches
110
4 200000
120
.25 .16666667 .25 .333333
130
9000. 9000. 9000. 9000.
140
.000654 .000698 .000741 .00806
150
Taxiway design subgrade damage thickness = 30 inches
160
4 200000
170
.25 .1666667 .25 .333333
180
9000. 9000. 9000. 9000.
190
.000733, .000789 .000844 .000927
200
Taxiway design subgrade damage thickness = 27 inches
210
4 200000
220
.25 .166667 .25 .33333
230
9000. 9000. 9000. 9000.
240
.000831 .000908 .000980 .001080
250
End of data
260
0 0
13.
EXAMPLE DESIGN FOR ALL BITUMINOUS CONCRETE (ABC) PAVEMENT.
a. The thickness of the ABC pavement required for the taxiway design is estimated by considering
the thickness of conventional pavement, i.e., 130 millimeters (5 inches) of asphaltic concrete and
610 millimeters (24 inches) of granular base and subbase. For this conventional pavement the effective
thickness would be 865 millimeters (34 inches) which when converted to an ABC pavement would give
an estimated thickness of 430 millimeters (17 inches) (computed by using the equivalence of 2 for bound
materials). For computation of the fatigue damage and subgrade damage, monthly time periods are
used as shown in Tables 11-12 and 11-13, respectively. Normally for ABC designs, the subgrade
damage will be the controlling criteria and thus the thickness for satisfying the subgrade criteria is first
determined. The subgrade strains are computed for six time periods so as to produce a plot as shown in
Figure 11-18. From this plot, the subgrade strains for each time period are determined and are given in
Tables 11-14 and 11-15. The data shown in Table 11-14 are input into the computer program
SUBGRADE to compute the subgrade damage factor. It is noted that an equivalent thickness of
865 millimeters (34 inches) is used to determine the applied strain repetitions, resulting in the same
number of strain repetitions as was used for the design of the conventional pavement. Damage factors
were computed for pavement thicknesses of 405, 430, 480, and 535 millimeters (16, 17, 19, and
21 inches) from which the plot of damage factor versus pavement thickness (Figure 11-19) was
11-18
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