In the current Federal Aviation Administration design criteria for runway and taxiway pavements, load repetitions are expressed in terms of coverages that represent the number of times a particular point on the pavement is expected to be stressed as a result of a given number of aircraft operations (passes). The coverages resulting from operations of a particular type of aircraft are a function of the number of aircraft passes, the number and spacing of wheels on the aircraft landing gear, the tire-contact area, and the lateral distribution of the aircraft wheel-paths relative to the pavement centerline or guideline markings. The collective effect of these factors is usually expressed in terms of derived pass-to-coverage ratios, based on the observed lateral distribution patterns of aircraft wheel-paths. Fundamental to the current procedure for converting aircraft passes to coverages is the assumption that aircraft wheel-paths for 75 percent of operations are practically uniformly distributred over a certain pavement width. In this study, this procedure was reexamined on the a priori assumption that aircraft wheel-paths conform more nearly to a normal (bell-shaped) than to a uniform distribution. Theoretical normal distribution curves were fitted to the limited number of actual wheel-path distribution data available and found to be much more representative of the actual distributions than are the distribution curves based on the uniform distribution assumption. Aircraft pass-to-coverage ratios based on the normal curves were calculated for both military and civil aircraft, although no measured traffic distribution data were available to verify the procedure for civil aircraft. /Author/

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    • This paper appeared in TRB Special Report 175, Research in Airport Pavements. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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    Transportation Research Board

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  • Authors:
    • HoSang, Victor A
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  • Publication Date: 1978

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  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 84-87
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  • Accession Number: 00189938
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: May 11 1979 12:00AM