ESTIMATING THE FREQUENCY OF MULTIPLE TRUCK LOADINGS ON BRIDGES

THE PURPOSE OF THIS STUDY WAS TO DEVELOP A MODEL TO ESTIMATE HOW MANY TRUCKS WILL BE ON A BRIDGE SIMULTANEOUSLY AND IN WHAT LANE THEY WILL BE TRAVELING. SEVERAL STUDY SECTIONS WERE SELECTED TO INCLUDE THE EXPECTED RANGE OF THE PARAMETERS THAT MIGHT AFFECT THE FREQUENCY OF MULTIPLE TRUCK LOADINGS ON BRIDGES. THREE TYPES OF HIGHWAYS WERE INVESTIGATED: TWO-LANE TWO-WAY UNDIVIDED, FOU-LANE DIVIDED, AND SIX-LANE DIVIDED. DATA WERE COLLECTED AT MIDDAY, AFTERNOON RUSH HOUR, AND IN THE EVENING FOR SEVEN SECTION LENGTHS RANGING FROM 100 FEET TO 400 FEET IN 50-FOOT INCREMENTS. THE EFFECT OF TRUCK SPEED, TRUCK VOLUME AND TOTAL TRAFFIC VOLUME ON THE FREQUENCY OF MULTIPLE TRUCK LOADING WAS ALSO INVESTIGATED. APPROXIMATELY 6000 TRUCKS WERE OBSERVED DURING THE COURSE OF THIS STUDY. ANALYSIS OF THE DATA INDICATED THAT TRUCK VOLUME WAS THE BEST PREDICTOR OF MULTIPLE TRUCK LOADINGS ON BRIDGES. A MODEL, A FAMILY OF CURVES, IS PRESENTED IN THE TEXT WHICH CAN BE USED TO ESTIMATE MULTIPLE TRUCKS FOR BRIDGES FROM 150 TO 350 FEET LONG WITH TRUCK VOLUME OF 0 TO 300 TRUCKS PER HOUR. ALSO, TABLES ARE INCLUDED WHICH CAN BE USED TO ESTIMATE THE LANE DISTRIBUTION AND THE PERCENTAGE OF DOUBLE AND TRIPLE MULTIPLE LANE LOADINGS. THE RESULTS OF THIS STUDY PROVIDE THE STRUCTURAL ENGINEER A REASONABLE ESTIMATE OF THE FREQUENCY OF MULTIPLE TRUCKS OCCURRING ON BRIDGES. THE EXISTING MODEL HAS LIMITATIONS, AS DISCUSSED IN THE TEXT, BUT IT WOULD NOT BE DIFFICULT TO OBTAIN MORE DATA TO BROADEN ITS SCOPE. /AUTHOR/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 66 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00210108
  • Record Type: Publication
  • Report/Paper Numbers: Final Rpt
  • Files: TRIS
  • Created Date: Jul 31 1974 12:00AM