RELATIONSHIP BETWEEN WEIGHTS MEASURED BY PERMANENT TRUCK SCALES AND GOLDEN RIVER WEIGH-IN-MOTION SCALES

The Kentucky Transportation Cabinet's Division of Planning purchased a Golden River Weigh-In-Motion system. The first assignment was to determine the optimum calibration setting for operating each weigh mat. The second assignment was to determine the sensitivity of the weigh data. The third assignment was to develop appropriate relationships to adjust the dynamic data to equivalent static data. A series of correlation efforts established the appropriate calibration factor for each weigh mat. Then the mats were installed at a site on I 64 in Shelby County and data were collected for over 1,600 trucks. From these data, it became evident that equations to adjust dynamic loads to equivalent static loads should be developed for individual axle locations on the truck rather than the gross weight as recommended by the manufacturer. The primary reason was that the steering axle's dynamic load was approximately 70% of the static axle load. The discrepancy is due to the torque transmitted from the engine to the drive axles which partially lifts the steering axle off the pavement. Therefore, equations were developed for: (1) steering axle; (2) single drive axle; (3) single axle on trailer; (4) drive tandem axles; (5) trailer tandem axles; (6) drive tridem axles; and (7) trailer tridem axles. Observations of truck dynamics combined with literature review indicated that dynamic axle loads are affected by: (1) engine torque; (2) temperature of rigid pavements; (3) location of axle on truck; (4) pavement roughness rather than pavement type; and (5) suspension system between truck frame and axles.

• Record URL:
  • http://uknowledge.uky.edu/ktc_researchreports/698
• Supplemental Notes:
  • Study title: Equivalent Axleloads from Weigh-In-Motion Data.
• Corporate Authors:

  University of Kentucky, Lexington

  Kentucky Transportation Center
  College of Engineering, 176 Raymond Building
  Lexington, KY  United States  40506-0281

  Kentucky Transportation Cabinet

  200 Mero Street
  Frankfort, KY  United States  40622

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Southgate, H F
• Publication Date: 1989-5

Language

• English

Media Info

• Pagination: 82 p.

Subject/Index Terms

• TRT Terms: Axle load force; Calibration; Correlation analysis; Dynamic loads; Engine operation; Equations; Information processing; Roughness; Sensitivity analysis; Static loads; Surface temperature; Suspension systems; Torque; Trucks; Trucks by weight; Weigh in motion scales; Weight
• Old TRIS Terms: Correlations; Permanent truck scales
• Subject Areas: Data and Information Technology; Highways; Motor Carriers; Operations and Traffic Management; Planning and Forecasting; Vehicles and Equipment; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00738916
• Record Type: Publication
• Source Agency: University of Kentucky, Lexington
• Report/Paper Numbers: KTC-89-31, Interim Report
• Contract Numbers: KYHPR-88-123
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Jul 16 1997 12:00AM