USE OF BENKELMAN BEAM DEFLECTIONS TO DETERMINE ALLOWABLE SPRING TONNAGES

THIS IS ONE OF SEVERAL REPORTS EMANATING FROM THE STUDY, APPLICATION OF AASHO ROAD TEST RESULTS TO DESIGN OF FLEXIBLE PAVEMENTS IN MINNESOTA. THE PURPOSE OF THE RESEARCH IS TO DETERMINE WHETHER BENKELMAN BEAM TESTS CAN BE USED TO ESTABLISH LOAD RESTRICTIONS ON HIGHWAYS IN THE SPRING WHEN PAVEMENTS ARE RELATIVELY WEAK. CURRENTLY, PLATE BEARING TESTS ARE USED FOR THIS PURPOSE. THE REPORT DESCRIBES THE DEVELOPMENT OF A NEW PROCEDURE, BASED PRINCIPALLY ON BENKELMAN BEAM TESTS OF 15 SELECTED IN-SERVICE PAVEMENTS DURING A 3-YEAR PERIOD. INCLUDED ARE /1/ A DETAILED SUMMARY OF THE METHOD, /2/ ANALYSIS OF ANNUAL DEFLECTION VARIATIONS, /3/ DETERMINATION OF ALLOWABLE DEFLECTIONS AND /4/ DEFLECTION-LOAD RELATIONS. THE FOLLOWING FINDINGS, CONCLUSIONS AND RECOMMENDATIONS ARE PRESENTED' /1/ THE RESEARCH HAS BEEN SUFFICIENTLY COMPREHENSIVE TO WARRANT TRIAL USAGE OF THE PROCEDURE DEVELOPED, /2/ AN ADVANTAGE OF A PROCEDURE BASED ON THE BENKELMAN BEAM IS THE LOW COST OF THE DEVICE. THIS WOULD WARRANT TESTING BY EACH HIGHWAY DISTRICT, /3/ IF TESTS ARE CONDUCTED BY EACH DISTRICT, THE ESTABLISHMENT AND REMOVAL OF LOAD RESTRICTIONS COULD BE MORE READILY ACCOMPLISHED. /4/ MINNESOTA HIGHWAY DEFLECTION DATA, TOGETHER WITH AASHO ROAD TEST AND OTHER RESEARCH RESULTS WILL EVENTUALLY HELP IN THE PREDICTION OF ROAD LIFE. /5/ USE OF THE BENKELMAN BEAM FOR ESTABLISHMENT OF LOAD RESTRICTIONS WOULD FREE THE PLATE BEARING TESTING APPARATUS FOR USE IN OTHER RESEARCH STUDIES. /BPR/

  • Supplemental Notes:
    • Hpr -1161, STATE 327, BPR 16
  • Corporate Authors:

    University of Minnesota, Minneapolis

    Minneapolis, MN  United States  55455

    Minnesota Department of Highways

    ,    
  • Publication Date: 1967

Subject/Index Terms

Filing Info

  • Accession Number: 00206302
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Sep 15 1994 12:00AM