AN INSTRUMENT SYSTEM FOR MEASURING PAVEMENT DEFLECTIONS PRODUCED BY MOVING TRAFFIC LOADS

THIS REPORT DESCRIBES A FEASIBILITY STUDY WHICH HAS LED TO THE DEVELOPMENT OF A "FIRST GENERATION" INSTRUMENT SYSTEM FOR MEASURING TRANSIENT PAVEMENT DEFLECTIONS. ACCELEROMETERS EMBEDDED IN THE PAVEMENT STRUCTURE ARE EMPLOYED TO SENSE THE BASIC MOTION. DUAL ANALOG INTEGRATION IS UTILIZED TO OBTAIN AND RECORD OUTPUT INDICATIONS PROPORTIONAL TO DISPLACEMENT. THE CIRCUIT CHARACTERISTICS ARE SUCH THAT TRANSIENT VERTICAL MOVEMENTS AS SMALL AS 0.002 INCH, OR HORIZONTAL MOVEMENTS AS SMALL AS 0.0005 INCH, OCCURRING WITHIN LESS THAN TWO SECONDS CAN BE RECORDED. THESE CHARACTERISTICS ENABLE THE SYSTEM TO BE USED, WITH VEHICLES TRAVELING AT SPEEDS ABOVE 20 MPH, IN ANY NORMAL PAVEMENT STRUCTURE. THESE PERFORMANCE CHARACTERISTICS COULD BE ALTERED, IF DESIRED, TO ACCOMMODATE THE LARGER, LONGER MOVEMENTS WHICH OCCUR ON BRIDGE DECKS.

  • Supplemental Notes:
    • RES STUDY 2-8-72-162 RES REPT 162-1F
  • Corporate Authors:

    Texas Transportation Institute

    Texas A&M University System, 1600 E Lamar Boulevard
    Arlington, TX  United States  76011
  • Authors:
    • Swift, G
  • Publication Date: 1972-8

Media Info

  • Pagination: 49 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00206520
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Final
  • Files: TRIS, ATRI, USDOT
  • Created Date: Apr 20 1974 12:00AM