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Towards Calibration of APSDS for Six Wheel Gear Loads
Conference paper

Towards Calibration of APSDS for Six Wheel Gear Loads

Gregory W White
FAA Worldwide Airport Technology Conference and Exposition, 2007 (Atlantic City, United States, 16-Apr-2007–18-Apr-2007)
Federal Aviation Administration (FAA)
2008
url
http://www.airporttech.tc.faa.gov/Airport-R-D/Conference-and-Workshop/Airport-RD-Conference-Detail/dt/Detail/ItemID/390/Towards-Calibration-of-APSDS-for-Six-Wheel-Gear-LoadsView
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Abstract

Civil Engineering Transportation and Freight Services
The empirical basis for aircraft pavement thickness determination is the full scale trafficking tests performed by the US Corps of Engineers between the 1940s and 1970s. This culminated in the publishing of the S77-1 design method, which relates subgrade deflection to the number of allowable repetitions of that deflection. Pavement life was found to depend not only upon the magnitude of deflection, but also upon the aircraft wheel configuration that produced that deflection. Consequently, different pavement thickness adjustment factors, called Alpha Factors, were required for each different wheel configuration. APSDS uses strain as its indicator of pavement damage. The APSDS relationships between strain and pavement life were not obtained by direct calibration against the Corps' full-scale trafficking tests, but by calibrating against S77-1. The initial APSDS calibration considered only dual and dual-tandem aircraft at maximum weight, and two coverage levels of 10,000 and 100,000. The relationships (subgrade failure criteria) were found to depend upon subgrade CBR. It was, however, assumed that the failure criteria were independent of wheel configuration.

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