DYNAMIC ANALYSIS OF FALLING WEIGHT DEFLECTOMETER DATA

The response of pavement systems to falling weight deflectometer (FWD) blows is evaluated by using a multidegree of freedom elastodynamic analysis. This analysis is based on a Fourier synthesis of a solution for periodic loading of elastic or viscoelastic horizontally layered strata. The method is verified for selected flexible pavement sections for which high-quality field and laboratory data are available in the literature. FWD deflection measurements at various geophone locations are compared by using dynamic as well as static analyses. The results indicate that inertial effects are important in the prediction of the pavement response. Conventional static analyses yield significantly different results and therefore yield erroneous (unconservative) predictions of pavement moduli back-calculated from deflection data. Elastodynamic analyses, based on fundamental material parameters (Young's modulus, mass density), appear to provide a useful vehicle for correlating pavement response between different loading modes (impulse, vibratory, etc.). Because resonance is a less important factor in the displacement response characteristics of pavements subjected to transient loading, deflection data obtained from transient loading devices are, in general, easier to interpret.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1986/1070/1070-008.pdf
• Summary URL:
  • https://scholar.google.com/scholar_lookup?title=DYNAMIC+ANALYSIS+OF+FALLING+WEIGHT+DEFLECTOMETER+DATA&author=B.+Sebaaly&author=M.+Mamlouk&author=T.+Davies&publication_year=1986
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• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Strength and Deformation Characteristics of Pavement Sections. 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
• Corporate Authors:

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• Authors:
  • Sebaaly, Boutros E
  • Mamlouk, Michael S
  • Davies, Trevor G
• Publication Date: 1986

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 63-68
• Monograph Title: PAVEMENT RESPONSE, EVALUATION, AND DATA COLLECTION
• Serial:
  • Transportation Research Record
  • Issue Number: 1070
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Deflection; Dynamic tests; Elastic waves; Errors; Falling weight deflectometers; Flexible pavements; Forecasting; Inertia; Mechanical properties; Modulus of elasticity; Pavements
• Uncontrolled Terms: Dynamic analysis; Elastodynamic analysis
• Old TRIS Terms: Pavement deflection
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00474201
• Record Type: Publication
• ISBN: 0309040647
• Files: TRIS, TRB
• Created Date: Oct 31 1987 12:00AM