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Title: Super-heavy aircraft study
Authors: United States. Federal Aviation Administration.
Barker, Walter R.
Gonzalez, Carlos R.
Keywords: Aircraft classification number
Airport pavement design
California bearing ratio
Elastic layered theory
Equivalent single-wheel load
Full-scale test section
Multiwheel aircraft
Pavement analysis
Pavement design
Pavement performance criteria
Flexible pavements
Elastic analysis
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-94-12.
Description: Technical Report
Abstract: The test data for performance of flexible pavements were collected, sorted, and tabularized. The test data were analyzed using Boussinessq and layered elastic pavement models. To assist in the analysis, two computer programs were developed. The first program used the Boussinessq model to compute equivalent single-wheel loads. This program will compute the equivalent single-wheel load considering any selected cutoff distance. The second program used layered elastic theory for the analysis of pavements structures. The program has the capability of determining maximum pavement response for several response parameters, determining allowable loads for selected performance criteria, and computing a new layered elastic aircraft classification number. Several different performance criteria were developed including deflection criteria employing different cutoff distances, and strain criteria determined from the layered elastic pavement model. It was shown that deflection and strain criteria could be developed for the design of heavy multiwheel aircraft which would be independent of the number of tires in the aircraft gear. Performance criteria based on deflection, vertical strain, horizontal shear strain, maximum shear strain, and octahedral strain were incorporated into the layered elastic computer program to give predictions for pavement performance. Comparisons of the strain criteria were made with the current design criteria. The indications are that the current U.S. Army Corps of Engineers (USACE) California Bearing Ratio (CBR) design procedure gives pavement thicknesses that are overly conservative for very low subgrade CBR values, but are inadequate for high subgrade CBR values. A new procedure is suggested for computing the aircraft classification number which would be based on an equivalent pavement response parameter.
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