DESIGN OF FLEXIBLE PAVEMENTS BY USE OF HP-41C/HP-97 PROGRAMMES

DIMENSIONERING AF FLEKSIBLE VEJBEFAESTELSER VED BRUG AF HP-41C/HP-97 PROGRAMMER

The HP-97/HP-41C program described in this report is a special modified version of the general "DELSAN 4" program published under separate cover (the National Danish Road Laboratory, Laboratory Report No 49A, see TRIS abstract 451902). Modifications have been made in accordance with Danish specifications and standard pavement and/or overlay design procedure, where calculations of critical stresses and strains are normally based upon the use of a single design wheel load and an assumed Poisson's ratio for all structural layers of 0.50. The special program is also limited to accommodate linear elastic materials only. The uppermost (asphalt-bound) layer can, if desired, be divided into two layers with different e-moduli, the program then proceeds to calculate the horizontal asphalt strain at the bottom of the lower bound layer. The theoretical approach used in the "DELSAN 4" systems is based upon the method of equivalent thicknesses and the integrated boussinesq equations for stresses and strains under the centerline of an evenly distributed, circular load. These specific equations, though, have been utilized and modified through a series of adjustments so as to effect the best possible agreement with absolute linear-elastic solutions (e.g., Chevron or BISAR program solutions). (TRRL)

• Corporate Authors:

  National Road Research Laboratory, Denmark

  Elisa Gaardsvij 5, P.O. Box 235
  Roskilde 4000,   Denmark 
• Authors:
  • Ertmann, H J
  • Stubstad, R N
• Publication Date: 1981-9

Language

• Danish

Media Info

• Features: Figures; References; Tables;
• Pagination: 26 p.

Subject/Index Terms

• TRT Terms: Calculation; Circles; Computer aided design; Computer programs; Deformation; Deformation curve; Design; Design load; Elasticity (Mechanics); Equations; Flexible pavements; Linear elasticity; Loads; Minicomputers; Modulus of elasticity; Pavement design; Pavement layers; Pavements; Poisson distributions; Poisson ratio; Size; Strength of materials; Strengthening (Maintenance); Stresses; Structural analysis; Theory
• Uncontrolled Terms: Plane (Mathematics)
• Geographic Terms: Denmark
• Old TRIS Terms: Poissons ratio
• ITRD Terms: 6464: Calculation; 6423: Circle; 5595: Deformation; 8028: Denmark; 9011: Design (overall design); 8673: Digital computer; 9014: Dimension; 5912: Elasticity; 2944: Flexible pavement; 2952: Layer; 5567: Load; 3055: Pavement design; 6419: Plane; 5924: Poisson's ratio; 8645: Software; 3096: Strengthening (pavement); 5575: Stress (in material); 5573: Stress analysis; 9078: Theory
• Subject Areas: Design; Highways; Pavements;

Filing Info

• Accession Number: 00451903
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: 49B
• Files: ITRD, TRIS
• Created Date: Jul 31 1986 12:00AM