FLEXIBLE-PAVEMENT DESIGN AS REVISED FOR HEAVY TRAFFIC
THE RATIONAL DESIGN OF A FLEXIBLE PAVEMENT INVOLVES THREE IMPORTANT FACTORS THAT MUST BE GIVEN CONSIDERATION: (1) THE MAGNITUDE AND NATURE OF THE APPLIED LOAD AND THE MODE OF ITS APPLICATION; (2) THE STRENGTH OR BEARING CAPACITY OF THE SUBGRADE SOIL AS WELL AS THE BEARING CAPACITY OF THE COMPONENTS OF THE PAVEMENT STRUCTURE (SUBBASE, BASE, AND SURFACE COURSE); AND (3) THE DISTRIBUTION OF THE PRESSURE EXERTED AT THE SURFACE OF THE PAVEMENT BY THE APPLIED LOAD. TWO METHODS FOR DETERMINING NECESSARY PAVEMENT THICKNESS ARE DESCRIBED. IN THE ORIGINAL METHOD THE PRESSURES EXERTED BY THE VARIOUS WHEEL LOADS WERE DETERMINED FROM THE INFLATION PRESSURES OBTAINED WHEN TRUCK-WEIGHT SURVEYS WERE CONDUCTED. THESE PRESSURES WERE INCREASED 10 PERCENT FOR TIRE-WALL STIFFNESS. THE AREAS OF CONTACT WERE OBTAINED BY DIVIDING THE WHEEL LOADS BY THE INFLATION PRESSURES, FROM WHICH DIAMETERS OF CIRCLES OF EQUAL AREAS WERE CALCULATED. THE REVISED METHOD OF DESIGN USES A DIFFERENT PROCEDURE FOR DETERMINING THE PRESSURES AND DIAMETER OF CONTACT AREA. THE REVISED METHOD USED THE FACT THAT DUAL WHEELS HAVE TWO CONTACT AREAS AND TOOK INTO CONSIDERATION THE SIZE OF THE TIRE AS RELATED TO LOAD-CARRYING CAPACITY. USING THE METHOD DESCRIBED, IT IS POSSIBLE TO OBTAIN THE PAVEMENT THICKNESS FOR HEAVY LOADS. /AUTHOR/
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Supplemental Notes:
- Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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Corporate Authors:
Highway Research Board (HRB)
Washington, DC -
Authors:
- Hicks, L D
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Conference:
- 33rd Annual Conference of the Highway Research Board
- Location: Washington District of Columbia, United States
- Date: 1954-1-12 to 1954-1-15
- Publication Date: 1954
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: 11p
- Monograph Title: Design of Flexible Pavements
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Serial:
- Highway Research Board Research Reports
- Issue Number: 16B
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Bearing capacity; Flexible pavements; Loads; Pavements; Pressure; Subbase (Pavements); Subgrade (Pavements); Thickness; Trucks
- Uncontrolled Terms: Pavement thickness; Pressure distribution; Subbase
- Subject Areas: Highways; Motor Carriers; Pavements;
Filing Info
- Accession Number: 00205964
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: May 22 1972 12:00AM