STRESS AND STRAIN MEASUREMENTS IN EXPERIMENTAL ROAD SECTIONS UNDER CONTROLLED LOADING CONDITIONS

THIS PAPER IS CONCERNED WITH A TEST FACILITY WHICH HAS BEEN DEVELOPED FOR MEASURING STRESSES AND STRAINS WITHIN EXPERIMENTAL ROAD STRUCTURES UNDER ROLLING WHEELS. THE OBJECT OF THE WORK IS: /1/ TO ASSESS THE INFLUENCE OF SPEED OF LOAD AND TEMPERATURE, AND /2/ TO COMPARE THE STRESSES AND STRAINS MEASURED WITH THOSE PREDICTED USING ELASTIC THEORY. THE LOAD IS APPLIED TO THE TEST AREA BY MEANS OF A SINGLE WHEEL WHICH RUNS ON AN EXACTLY CONTROLLED COURSE. THIS TECHNIQUE HAS BEEN ADOPTED IN ORDER TO FACILITATE INTERPRETATION OF THE RESULTS AND REDUCE THEIR SCATTER. THE LOADING TRUCK RUNS ON RAILS WHICH FROM A BRIDGE OVER THE TEST AREA AND IS PULLED BACKWARDS AND FORWARDS BY MEANS OF A CABLE. CONSTANT SPEEDS UP TO A MAXIMUM OF 50 KM/HOUR CAN BE OBTAINED, AND THE LOAD MAY BE VARIED BETWEEN 0.4 AND 2.0 TONS. THE TYPE OF TYRE AND TYRE PRESSURE MAY ALSO BE VARIED. A TEST AREA 10 X 10 METRES IS USED IN ORDER TO AVOID EDGE EFFECTS. STRAIN GAUGES ARE GLUED TO BLOCKS OF THE ASPHALT MIX AND THESE BLOCKS ARE SET IN THE BITUMEN BOUND COURSES IN SUCH A MANNER THAT THE STRAIN GAUGES LIE PARALLEL AND TRANSVERSE TO THE DIRECTION OF TRAVEL. PROVISION IS MADE FOR THE ASPHALT BLOCKS TO FORM A SINGLE ENTITY WITH THE SURROUNDING ASPHALT MIX. RIGID PRESSURE MEASURING CELLS ARE PLACED IN THE UNBOUND COURSES TO MEASURE THE STRESSES OCCURRING THERE, AND THERMO-COUPLES ARE EMBEDDED IN ALL COURSES TO MEASURE THE TEMPERATURE. /AUTHOR/

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Filing Info

  • Accession Number: 00206642
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 1 1994 12:00AM