A FLEXIBLE PAVEMENT STRUCTURAL EVALUATION SYSTEM BASED ON DYNAMIC DEFLECTIONS (WITH DISCUSSION)

In a layered linear elastic model of a pavement, each layer can be characterized by its Young's modulus of elasticity (E) and Poisson's ratio. Reasonable values of Poisson's ratio can be assumed for typical pavement materials; these generally fall in a very narrow range. If the thickness of each layer and its E value are known, then, assuming a semi-infinite subgrade, a unique pavement response such as surface deflections can be theoretically predicted. However, structural evaluation of a pavement based on dynamic deflection basin poses some major problems such as: (1) the possibility of non-uniqueness of in situ Young's moduli (in a multilayered pavement several combinations of moduli can yield similar deflection basins); (2) errors due to the assumption of a semi-infinite subgrade when actually a rock layer exists at a shallow depth of subgrade; (3) errors in the calculated in situ moduli due to nonlinear behavior of granular layers and subgrade; and (4) errors from neglecting the temperature effect. This paper describes investigations related to these considerations in order to develop a structural evaluation methodology based on dynamic deflection basins. A computer program, FPEDD1 (a flexible pavement structural evaluation system based on dynamic deflections - version 1.0), has been developed and is described in this paper with example applications.

• Corporate Authors:

  Association of Asphalt Paving Technologists (AAPT)

  400 Selby Avenue, Suite I
  St Paul, MN  United States  55102
• Authors:
  • Uddin, Waheed
  • Meyer, A H
  • Hudson, W R
• Conference:
  • Association of Asphalt Paving Technologists Proc
• Publication Date: 1985

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 432-453
• Serial:
  • Volume: 54

Subject/Index Terms

• TRT Terms: Computer programs; Deflection; Flexible pavements; Modulus of elasticity; Poisson distributions; Poisson ratio; Structural analysis
• Old TRIS Terms: Dynamic deflections
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00739626
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 4 1997 12:00AM