HEAVY VEHICLE EVALUATION FOR OVERLOAD PERMITS

Highway agencies often receive requests for permits to allow the movement of overloaded machinery, structures, and other commodities. Many highway departments issue permits up to a standard axle loading of approximately 27,000 lb; however, they do not have sufficient data to respond to requests for other loads and axle configurations. A study for the Pennsylvania Department of Transportation analyzed the expected pavement damage resulting from overloaded axle configurations, in particular, four- and five-axle configurations with loads up to 34,000 lb. A computer simulation approach was used to model both flexible and rigid pavements. Flexible pavements were analyzed with structural numbers of 2.92 and 4.82 representing a low and high structural capacity, respectively. Rigid pavement was analyzed as a 10-inch slab on 6 inches of crushed aggregate base. Calculated strains and deflections were compared to limiting tensile and vertical strains (flexible pavements) and stress ratios (rigid pavements). The remaining life of each pavement was evaluated. It was found that four- and five-axle configurations developed the same tensile stresses as the single- and tandem-axle configurations for a thin flexible pavement, but the strains were lower for the thick pavement cross section. The stress ratios for the rigid pavement for all axle loads and configurations were below 50%, which implies that an unlimited number of repetitions can be applied.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1989/1227/1227-019.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=HEAVY+VEHICLE+EVALUATION+FOR+OVERLOAD+PERMITS&author=W.+Kilareski&publication_year=1989
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309048222
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1227, Rigid and Flexible Pavement Design and Analysis: Unbound Granular Materials, Tire Pressures, Backcalculation, and Design Methods. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Kilareski, Walter P
• Publication Date: 1989

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 194-204
• Monograph Title: Rigid and flexible pavement design and analysis: unbound granular materials, tire pressures, backcalculation, and design methods
• Serial:
  • Transportation Research Record
  • Issue Number: 1227
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Axle load force; Axles; Deflection; Flexible pavements; Heavy vehicles; Oversize loads; Pavements; Permits; Rigid pavements; Service life; Simulation; Strain (Mechanics); Stress ratio; Tension; Trucks
• Uncontrolled Terms: Axle configurations; Overloads
• Old TRIS Terms: Pavement deflection; Pavement life; Strains; Truck pavement damage
• Subject Areas: Design; Highways; Motor Carriers; Operations and Traffic Management; Pavements; I10: Economics and Administration;

Filing Info

• Accession Number: 00495079
• Record Type: Publication
• ISBN: 0309048222
• Files: TRIS, TRB, ATRI
• Created Date: Jun 30 1990 12:00AM