STRESSES AND DISPLACEMENTS IN VISCOELASTIC PAVEMENT SYSTEMS UNDER A MOVING LOAD

THE ANALYSIS DESIGN OF FLEXIBLE PAVEMENTS REQUIRE A KNOWLEDGE OF THE STRESSES AND DISPLACEMENTS INDUCED BY TRAFFIC. THIS PAPER IS A STUDY OF THE RESPONSE OF VISCOELASTIC MATERIALS TO MOVING LOADS IN PAVEMENT SYSTEMS. BY NEGLECTING THE INERTIA EFFECT, EXPRESSIONS FOR STRESSES AND DISPLACEMMENTS IN SINGLE-AND TWO- LAYERED VISCOELASTIC SYSTEMS ARE DEVELOPED FOR A MOVING CONCENTRATED LOAD BASED ON THE ELASTIC-VISCOELASTIC CORRESPONDENCE PRINCIPLE. NUMERICAL SOLUTIONS ARE PRESENTED FOR VARIOUS TYPES OF MATERIALS AT VARIOUS SPEEDS OF THE LOAD. DISCUSSIONS OF THE INFLUENCE AND RELATIVE IMPORTANCE OF VARIOUS FACTORS AFFECTING THE SOLUTIONS ARE PRESENTED. COMPARISONS ARE MADE BETWEEN EXISTING FIELD MEASUREMENTS OF STRESS AND DISPLACEMENT AND THE RESULTS OBTAINED IN THIS STUDY. THE COMPUTED STRESSES AND DISPLACEMENTS DECREASE WITH INCREASING SPEED OF THE LOAD AS WELL AS WITH INCREASING VALUE OF RETARDATION TIME OF THE VISCOELASTIC MATERIAL. FOR VISCOUS MATERIALS, DISPLACEMENTS CONTINUE TO INCREASE AS THE LOAD MOVES AWAY FROM THE STATION. THE STRESSES AND DISPLACEMENTS IN THE SUBGRADE SOILS ARE REDUCED WHEN A REINFORCING LAYER IS PRESENT. THE DEGREE OF REDUCTION DEPENDS ON THE SPEED OF THE LOAD AND THE RELATIVE MATERIAL PROPERTIES FOR EACH LAYER. /AUTHOR/

• Supplemental Notes:
  • 0562,hpr-1(5)
• Corporate Authors:

  Virginia Highway Research Council

  Charlottesville, VA  United States 

  Virginia Department of Highways

  Richmond, VA  United States  23219

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • Chou, Y T
• Publication Date: 1969

Subject/Index Terms

• TRT Terms: Accelerated tests; Dislocation (Geology); Field tests; Flexible pavements; Measurement; Motion; Motor vehicles; Numerical analysis; Pavement design; Repeated loads; Stresses; Subgrade (Pavements); Viscoelasticity
• Uncontrolled Terms: Field measurements; Moving vehicles
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 00206412
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Report/Paper Numbers: HPR-1(5), 0562
• Files: TRIS, STATEDOT
• Created Date: Jul 14 1970 12:00AM