A modified Chevron N-Layer computer program has the capability of calculating the 'work' done by the total load on a given load group. Earlier analyses of AASHO Road Test sections and test vehicles had permitted the development of damage factor relationships. This paper presents seven, namely two-tire and four-tire single axles, tandems, triaxles, and four-axle, five-axle, and six-axle groups. The two-tire axle (front or steering axle) has the most severe damage relationship. The 80-kN (18-kip) four-tire single axle was used as the reference axle and was assigned a damage factor of 1.0 for a specific amount of 'work'. Other axle arrangements and total loads producing that amount of 'work' were 63.6kN (14.3 kips) for the two-tire axle, 166.4kN (37.4 kips) for eight-tire tandems, 250.2kN (56.25 kips) for twelve-tired triaxles, 333.6kN (75.0 kips) for a sixteen-tired four-axle group, 415.0kN (93.3 kips) for a twenty-tired five axle group, and 496.4kN (111.6 kips) for a twenty-four-tired six-axle group.


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    Title :

    Fatigue Damage of Flexible Pavements under Heavy Loads


    Contributors:
    J. H. Havens (author) / R. C. Deen (author) / H. F. Southgate (author)

    Publication date :

    1979


    Size :

    25 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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