DYNAMIC PAVEMENT LOADS OF HEAVY HIGHWAY VEHICLES

ALTHOUGH DYNAMIC VEHICLE LOADS ARE ASSUMED TO AFFECT THE LIFE EXPECTANCY OF PAVEMENT AND BRIDGE STRUCTURES, THE DEGREE OF INFLUENCE HAS BEEN CONJECTURAL. GMC HAS UNDERTAKEN RESEARCH TO EXAMINE THE DYNAMIC PAVEMENT LOADS INFLICTED BY HEAVY HIGHWAY VEHICLES, WITH PARTICULAR ATTENTION TO PAVEMENT ROUGHNESS CHARACTERISTICS AND CERTAIN VEHICLE CHARACTERISTICS; TO LEARN AND SPECIFY WHICH, AND TO WHAT DEGREE, VEHICLE CHARACTERISTICS AFFECT PEAK DYNAMIC PAVEMENT LOADS; AND TO DEVELOP A TECHNIQUE FOR PREDICTING DYNAMIC PAVEMENT LOADS FOR A MEASURED ROAD PROFILE AND VEHICLE CHARACTERISTICS. THE PROJECT FELL INTO THREE PHASES: LITERATURE AND FIELD SURVEYS, EXPERIMENTS, AND SIMULATION AND PREDICTION. SPECIAL EMPHASIS WAS GIVEN TO ASCERTAINING THE TYPES AND CHARACTERISTICS OF VEHICLES THAT PRODUCED THE LARGEST DYNAMIC LOADS, TO DEVELOPING A DEVICE FOR MEASURING FORCES AT THE TIRE/ROAD INTERFACE, AND TO DEVELOPING A PREDICTIVE METHODOLOGY. A VARIETY OF SPEED, LOAD, AND ROAD CONDITIONS WAS TESTED. TWO ON-BOARD DEVICES FOR MEASURING DYNAMIC PAVEMENT LOAD ON A LONG-TERM, CONTINUOUS BASIS WERE PERFECTED. IT WAS FOUND THAT TYPICAL SURFACE IRREGULARITIES CAN PRODUCE VARIABLE PAVEMENT LOADS MORE THAN DOUBLE THE STATIC LOADS. DYNAMIC LOADS RELATED TO WHEEL ROTATION WERE MEASURED AND FOUND TO BE SUFFICIENTLY LARGE TO MERIT FURTHER STUDY. AN ANALOG COMPUTER SIMULATION OF A HEAVY HIGHWAY VEHICLE PREDICTED PAVEMENT LOADS FROM RECORDED ROAD PROFILES WITH AN OVERALL ACCURACY OF 85%. TIRE STIFFNESS, TIRE ENVELOPING PROPERTIES, AND THE WEIGHT OF THE UNSPRUNG MASS WERE COMPUTED TO HAVE A MAJOR INFLUENCE ON THE MAGNITUDE OF PAVEMENT LOADS. A DATA SET OF MEASURED PAVEMENT LOADS FOR HEAVY VEHICLES TRAVERSING VARIOUS PUBLIC HIGHWAYS IS PRESENTED. BECAUSE SOME OF THE RESEARCH FINDINGS ARE BASED ONLY UPON THE THREE TEST VEHICLES, NO BROAD CONCLUSIONS ARE WARRANTED WITHOUT FURTHER STUDY, WHICH IS NOW IN PROGRESS.

  • Availability:
  • Supplemental Notes:
    • 94 PP, FIGS, TABS, PHOTS, 10 REF, 22 APP
  • Publication Date: 1970

Media Info

  • Serial:
    • NCHRP Report
    • Issue Number: 105
    • Publisher: Transportation Research Board
    • ISSN: 0077-5614

Subject/Index Terms

Filing Info

  • Accession Number: 00223392
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: May 3 1971 12:00AM