SENSITIVITY, UNCERTAINTY AND THE VESYS METHOD OF STRUCTURAL ANALYSIS OF ROAD PAVEMENTS

Current methods of road pavement design generally take the strength and/or stiffness properties of both the pavement and subgrade materials into account in terms of the California bearing ratio or resilient modulus of the material concerned. More recent methods of analysis take into account parameters which represent the permanent- deformations of the materials where the permanent- deformation is measured under conditions of repeated loading, usually as part of a triaxial testing program. This paper has been concerned with the problem of estimating the significance of changes in the permanent-deformation characteristics of both unbound pavement materials and subgrade materials, by using a modified version of the VESYS computer program for the structural analysis of road pavements. A risk analysis has been carried out by computing the expected value and variance of the present serviceability index (psi) for two examples of road pavements in terms of the expected values and variances of each of the input variables. When the variables were divided into four groups, namely, the permanent-deformation characteristics of the materials, the elastic properties of the materials, the traffic variables and other variables respectively, it was found that, for each pavement studied, the uncertainty (variance) in the psi was dominated by the contributions made by the group of variables concerned with the permanent-deformation characteristics of the materials. The number of the covering abstract for the conference is TRIS No. 393385. (Author/TRRL)

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  • Supplemental Notes:
    • The Proceedings of the 12th Australian Road Research Board Conference, Hobart, Tasmania, 27-31 August 1984.
  • Corporate Authors:

    ARRB

    Melbourne, Victoria  Australia 
  • Authors:
    • Kinder, D F
  • Publication Date: 1984

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 89-101
  • Serial:

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Filing Info

  • Accession Number: 00393434
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jul 31 1985 12:00AM