Load Rating of Light Pavement Structures

Details

• Creators:
  Chua, Koon Meng ; Lytton, Robert L.
• Corporate Creators:
  Texas Transportation Institute. Texas A&M University
• Corporate Contributors:
  Texas State Department of Highways and Public Transportation ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Computers Dynaflect Falling Weight Deflectometers Hyperbolic Functions Load Factor Loads Overweight Loads Pavements Procedures
• Publication/ Report Number:
  FHWA/TX-85/09+284-6F
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas ; United States
• Edition:
  Interim: September 1979 - December 1983
• Corporate Publisher:
  Texas Transportation Institute. Texas A&M University
• Abstract:
  This report presents a new approach of determining the damage that overweight vehicles can do to light pavement structures. This computerized procedure uses results obtained from the Dynaflect or the Falling Height Deflectometer to determine the number of passes of a specific load that will cause a critical level of rut depth in a light pavement structure. This method was based on field observations and ILLI-PAVE, a finite element pavement analysis program. In the study, hyperbolic curve is used to describe both the stress softening and stress hardening form of load-deflection characteristics observed on light pavements. A method of determining the nonlinear elastic material models for the base course and the subgrade using the Falling Weight Deflectometer or the Dynaflect was developed. From the data collected with the Pavement Dynamic Cone Penetrometer, it appears that the stiffness of the granular base course depends to a large extent on the degree of compaction of the material. The model adopted for repetitive loading follows a hyperbolic-shaped loading and reloading load I deflection curve with a linear unloading path. Thick pavement which is usually the stress hardening type appears to be more resistant to rutting. The new approach is shown to be accurate in predicting the development of rut depth with repeated loads applied by a variety of different vehicles. A computer program is written to incorporate the complete analysis method, and a convenient data coding form is provided to make data entry more convenient.
• Format:
  PDF
• Funding:
  2-8-80-284
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:2746e9f78791f5a96f4c3cde8812d557d60973aee230d404ce65dc4eb1831d79557a4de6056c2b5f269c2cde877dd67ebc7c1e67e0435133173fc45f3e95a773
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/85157/dot_85157_DS1.pdf
• File Type:
  [PDF - 3.92 MB ]