Two-step Method of Designing Distribution of Material Stiffness in Perpetual Pavement to Prevent Structural Rutting and Fatigue

A two-step method for stiffness distribution design with application to perpetual pavements is proposed. In the first step resultant stiffness of asphalt concrete layers is estimated using nomograms obtained via solution of three-dimensional problem of a layered half-space. As controlling parameter vertical strain in the soil base is used. In the second step simplified model of composite beam is applied to predict distribution of stiffness within the asphalt layers. In order to derive design formulas, criterion of equality of stiffness of composite beam's cross-section and stiffness of a homogeneous reference layer being a part of layered system, and criterion of horizontal tensile stress reduction at critical locations are used. Obtained formulas require input of thicknesses of individual layers and some material properties, including strain endurance limits.


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  • Accession Number: 01609876
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 26 2016 12:09PM