The motion of vehicles over pavements makes the problem of predicting consequent effects time dependent. Present design procedures, however, account for this motion as a sequence of equivalent static conditions reduced to passes or coverages. A solution to this problem was obtained by verifying the following hypothesis: A pavement system operated upon by a vehicular input produces an output response. Relating the two is a time dependent transfer (TDT) function that contains within it the properties of the system. This function is obtained, in a mathematical sense, using Laplace transformations, without the need to simulate respective material performance or to determine values for preselected descriptors. The TDT functions can be employed to predict a pavement system's response and performance when subjected to an imposed load. The investigation was carried out by extending transfer function theory in connection with a finite convolution procedure to define the pavement's TDT functions. Full scale dynamic tests (moving trucks and aircraft) were performed in service environments (6 highway and 2 runway cross-sections). It has been shown that the TDT functions obtained do represent the characteristics of flexible pavements. Changes in parameters of the TDT function reflect changes in pavement performance and conditions. /FHWA/

  • Supplemental Notes:
    • Sponsored by the Indiana State Highway Commission. Conducted in cooperation with the Department of Transportation, Federal Highway Administration.
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284
  • Authors:
    • Harr, M E
    • Baladi, G Y
  • Publication Date: 1977-5-16

Media Info

  • Pagination: 159 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00178815
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-78-S0721 Final Rpt., FCP 45D1-121
  • Contract Numbers: 1(14) Part II
  • Files: TRIS, USDOT
  • Created Date: Sep 14 1978 12:00AM