A THEORETICAL AND EXPERIMENTAL STUDY OF DYNAMIC HIGHWAY LOADING

MATHEMATICAL MODELS OF FIVE REPRESENTATIVE CLASSES OF HIGHWAY VEHICLES HAVE BEEN FORMULATED AND VERIFIED BY EXTENSIVE FIELD EXPERIMENTATION. GOOD AGREEMENT WAS FOUND BETWEEN COMPUTED AND MEASURED WHEEL FORCES FOR ALL VEHICLE TYPES, VEHICLE SPEEDS (10 TO 60 MPH), AND ROAD SURFACE ROUGHNESS PATTERNS INVESTIGATED. THESE MATHEMATICAL SIMULATION MODELS WHICH DESCRIBE REALISTIC DYNAMIC LOADING PATTERNS CAN NOW BE USED DIRECTLY FOR DESIGN OF PAVEMENTS AND BRIDGES AND FOR RESEARCH ON IMPROVED STRUCTURAL DESIGN PROCEDURES. THE PAVEMENT LOADING EXPERIMENTS DEMONSTRATED THAT THE COMPLEX INTERACTION BETWEEN A MOVING VEHICLE AND A ROAD SURFACE PROFILE WITH IRREGULARITIES LESS THAN 3/4-INCH HIGH RESULTED IN DYNAMIC WHEEL LOADS THAT WERE UP TO DOUBLE THE STATIC WEIGHTS. SIMILARLY, AN INVESTIGATION OF A THREE-SPAN CONTINUOUS STEEL GIRDER BRIDGE INDICATED THAT EVEN THOUGH THE SMALL TOTAL DEFLECTION OF THE STRUCTURE (ABOUT 0.1-INCH MIXIMUM IN A 50-FOOT SPAN) HAD LITTLE EFFECT ON THE BEHAVIOR OF THE TEST VEHICLE, ROAD SURFACE ROUGHNESS ON THE APPROACH PAVEMENT OR ON THE BRIDGE DECK PRODUCED IMPACT WHEEL LOADS MORE THAN 100 PERCENT GREATER THAN STATIC WEIGHT. THE INERTIA OF MASSIVE STRUCTURES ATTENUATES THE EFFECTS OF THESE DYNAMIC WHEEL LOADS, BUT PAVEMENT SURFACES AND BRIDGE DECKS EXPERIENCE THE FULL IMPACT. A STATISTICAL ANALYSIS OF THE EXPERIMENTAL DATA SHOWED THAT A SINGLE PAIR OF DYNAMIC SCALES INSTALLED FLUSH WITH THE PAVEMENT SURFACE CAN BE USED TO ESTIMATE STATIC WHEEL LOADS AND GROSS VEHICLE WEIGHTS WITH ACCURACY ACCEPTABLE FOR TRAFFIC SURVEY PURPOSES WITH THE ADVANTAGES OF SAFETY, CONVENIECNE, AND ECONOMY TO BOTH THE HIGHWAY DEPARTMENT AND THE ROAD USERS. /FHWA/

  • Supplemental Notes:
    • RES STUDY 3-8-67-108
  • Corporate Authors:

    Texas State Department of Highways & Public Transp

    11th and Brazos Streets
    Austin, TX  USA  78701

    University of Texas, Austin

    Center for Highway Research, 200 West 21st Street
    Austin, TX  USA  78712

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Al-rashid, N I
    • Lee, C E
    • Dawkins, W P
  • Publication Date: 0

Media Info

  • Pagination: 315 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00205400
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Final Rept
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Jun 19 1973 12:00AM