AASHTO Flexible Pavement Design Equation Study
Publication: Journal of Transportation Engineering
Volume 115, Issue 5
Abstract
A revised flexible pavement design equation has recently been published by the American Association of State Highway and Transportation Officials. The revised equation contains new input parameters: resilient modulus, , to characterize subgrade support; reliability, R to allow the designer to introduce the concept of risk analysis into the design process; and standard error, , to represent variability in design input values. This paper summarizes the results of a significance study performed using the revised flexible pavement design equation. The study demonstrates the relative importance of design equation input parameters and provides insights into the relative change in required pavement structure thickness resulting from variations or errors in input parameter values. Study results show that variation in subgrade resilient modulus, , has the most pronounced effect on thickness structural number, SN. Variation in the predicted number of 18-kip equivalent single-axle loads, W18, has a lesser effect, and variation in combined standard error, , has a minimal effect on . Selection of the highest values for design reliability, R, results in significant increases in Sn.
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References
1.
AASHTO guide for design of pavement structures. (1986). Am. Assoc., of State Highway and Transp. Officials, Washington, D.C.
2.
AASHTO interim guide for design of pavement structures. (1972). Am. Assoc. of State Highway and Transp. Officials, Washington, D.C.
3.
“AASHO interim guide for the design of flexible pavement structures.” (1961). AASHO Committee on Design, Am. Assoc. of State Highway Officials, Washington, D.C.
4.
“AASHO interim guide for the design of rigid pavement structures.” (1962). AASHO Committee on Design, Am. Assoc. of State Highway Officials, Washington, D.C.
5.
Van Til, C. J., et al. (1972). “Evaluation of AASHTO interim guides for design of pavement structures.” NCHRP Report 128, Highway Res. Board, National Res. Council, Washington, D.C.
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Copyright © 1989 ASCE.
History
Published online: Sep 1, 1989
Published in print: Sep 1989
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