PAVEMENT DEFLECTIONS USING PHOTOGRAMMETRIC TECHNIQUES

DURING THE PAST EIGHTEEN MONTHS, RESEARCH HAS BEEN CONDUCTED AT THE OHIO STATE UNIVERSITY OF USE OF PHOTOGRAMMETRIC TECHNIQUES IN MEASURING PAVEMENT SURFACE DEFLECTIONS UNDER DYNAMIC LOADING. ALTHOUGH THE WORK HAS BEEN RESTRICTED TO SURFACE MEASUREMENTS, BASE AND SUBGRADE MOVEMENT CAN ALSO BE DETERMINED BY SIMILAR METHODS. CONTROL MEASUREMENTS WERE OBTAINED WITH DEFLECTION BRIDGES USING CONVENTIONAL EXTENSOMETERS, WITH A BENKELMAN BEAM DEVICE, AND WITH STANDARD ELECTRONIC TECHNIQUES (LVDT). EACH OF THESE METHODS FOR DEFLECTION MEASUREMENTS HAS ITS DISADVANTAGES, THE MOST SERIOUS BEING THE INABILITY TO GET NEAR OR UNDER THE MOVING VEHICLE OR THE TIME AND EXPENSE REQUIRED TO OBTAIN AN INDIVIDUAL READING. PHOTOGRAMMETRIC METHODS PERMIT DEFLECTION READINGS EVERYWHERE EXCEPT BENEATH THE TIRE ITSELF. MANY POINTS CAN BE STUDIED IN A SINGLE PHOTOGRAPH, AND DEFLECTION "CONTOURS" CAN BE DRAWN. THE MAJOR DISADVANTAGE IS IN THE ACCURACY OF THE MEASUREMENTS. THE REPORT COVERS NUMEROUS CASES WHERE THE ACCURACY OBTAINED IS WITHIN 0.005 IN. OF THE DEFLECTION MEASURED BY CONVENTIONAL METHODS. /AUTHOR/

  • Supplemental Notes:
    • Vol 36, pp 207-220, 10 FIG, 12 REF
  • Authors:
    • Baker, R F
  • Publication Date: 1957

Media Info

  • Monograph Title: Proceedings of the Thirty-Sixth Annual Meeting of the Highway Research Board, Washington, D.C., January 7-11, 1957
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00207347
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: May 22 1972 12:00AM