00757491

Component

https://doi.org/10.3141/1639-12

http://scholar.google.com...irao&publication_year=1998

The purpose of this investigation was to examine the feasibility of using conventional pavement analysis tools to derive mechanistic-empirical load equivalency factors (LEFs) applicable to wheel assemblies and pavement cross-sections not included in the AASHTO guide tables in a manner that would provide seamless continuity with current pavement engineering practices. The derivation of such LEFs was pursued on the assumption that two controversial concepts - namely, load equivalency and linear damage accumulation - were, in fact, valid. The purpose of this assumption is to investigate whether it is possible to reach reasonable conclusions for as long as no theoretically valid alternatives to these concepts are available. It was found that it is possible to reproduce with a reasonable fit the statistical/empirical LEFs found in the AASHTO guide tables, using layered elastic analysis and the fatigue relationship derived by Vesic and Saxena. Other conventional fatigue relationships yield unreliable results when compared to the AASHTO LEFs. It is also possible to derive mechanistic-empirical extensions to the AASHTO LEFs using this approach, so tire configurations and pavement cross-sections not included in the AASHTO tables of LEFs can be accommodated in a seamless and equitable manner.

This paper appears in Transportation Research Record No. 1639, Recent Pavement Research Issues.

English

p. 112-119

1998

Transportation Research Record

0309065119

References (20) ; Tables (6)

Defects; Elastic analysis; Fatigue (Mechanics); Load factor; Mechanistic design; Pavements

Layered elastic analysis; Load equivalency factors; Pavement damage; Relationships

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces

TRIS, TRB, ATRI

Dec 9 1998 12:00AM

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