FATIGUE DAMAGE OF FLEXIBLE PAVEMENTS UNDER HEAVY LOADS

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.

• Record URL:
  https://doi.org/10.13023/KTC.RR.1979.518
• Corporate Authors:

  Kentucky Department of Transportation

  Bureau of Highways
  Frankfort, KY  United States  40601
• Authors:
  • Havens, J H
  • Deen, R C
  • Southgate, H F
• Publication Date: 1979-4

Media Info

• Pagination: 25 p.

Subject/Index Terms

• TRT Terms: Computer programs; Failure; Fatigue (Mechanics); Fatigue strength; Flexible pavements; Loading and unloading; Loads; Strain (Mechanics); Trafficability
• Uncontrolled Terms: Fatigue life
• Old TRIS Terms: Heavy load; Strain energy methods
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00318425
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: RR-518
• Files: NTIS, TRIS, STATEDOT
• Created Date: Oct 8 1981 12:00AM