COMPUTATION OF EQUIVALENT SINGLE-WHEEL LOADS USING LAYERED THEORY
A METHOD BASED ON ELASTIC LAYERED THEORY AND PROGRAMMED FOR A HIGH-SPEED COMPUTER WAS DEVELOPED FOR DETERMINING EQUIVALENT SINGLE-WHEEL LOADS FOR DUAL WHEELS. IT WAS FOUND THAT EQUIVALENT SINGLE-WHEEL LOADS BASED ON EQUAL VERTICAL DEFLECTION AT THE PAVEMENT-SUBGRADE INTERFACE WERE GENERALLY GREATER THAN THOSE BASED ON EQUAL VERTICAL STRESS OR EQUAL SURFACE DEFLECTION. THE EFFECT OF VARIOUS FACTORS ON EQUIVALENT SINGLE-WHEEL LOADS WAS INVESTIGATED, USING EQUAL-INTERFACE DEFLECTION CRITERION. IT WAS FOUND THAT THE RATIO BETWEEN THE TOTAL LOAD ON DUAL WHEELS AND THE EQUIVALENT SINGLE-WHEEL LOAD DEPENDS ON THREE FACTORS: PAVEMENT THICKNESS, WHEEL SPACING, AND MODULUS RATIO, WHICH IS THE RATIO OF THE MODULI OF ELASTICITY OF PAVEMENT AND SUBGRADE. CHARTS THAT GIVE THE INTERFACE DEFLECTION UNDER A CIRCULAR LOAD FOR VARIOUS PAVEMENT THICKNESSES, OFFSET DISTANCES, AND MODULUS RATIOS ARE PRESENTED SO THAT THE EQUIVALENT SINGLE-WHEEL LOAD FOR ANY GIVEN LOADING AND PAVEMENT CONDITION CAN BE DETERMINED. AN IMPORTANT FACT REVEALED BY THIS STUDY IS THAT THE EQUIVALENT SINGLE-WHEEL LOAD INCREASES APPRECIABLY WITH THE INCREASE IN MODULUS RATIO. THE CURRENT METHOD OF ASSUMING THAT PAVEMENTS ARE HOMOGENEOUS MEDIA WITH A MODULUS RATIO OF UNITY ALWAYS GIVES AN EQUIVALENT SINGLE-WHEEL LOAD THAT IS TOO SMALL AND IS NOT IN LINE WITH THE FINDINGS OF THE WASHO ROAD TEST. /AUTHOR/
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Supplemental Notes:
- Paper sponsored by Committee on Theory of Pavement Design and presented at the 48th Annual Meeting.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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Authors:
- Huang, Y H
- Publication Date: 1969
Media Info
- Media Type: Print
- Features: Appendices; Figures; References; Tables;
- Pagination: pp 144-155
- Monograph Title: Design, evaluation, and performance of pavement systems
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Serial:
- Highway Research Record
- Issue Number: 291
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Computer programs; Elasticity (Mechanics); Modulus of elasticity; Pavements; Spacing; Thickness; Wheel loads; Wheels
- Uncontrolled Terms: Pavement thickness
- Old TRIS Terms: Elastic theory; Single wheel load
- Subject Areas: Highways; Pavements; Vehicles and Equipment;
Filing Info
- Accession Number: 00205779
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Mar 9 1970 12:00AM