UFC 3-260-02

30 June 2001

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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