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Title: DETERMINATION OF DEFLECTION OF PAVEMENT SYSTEMS USING VELOCITY TRANSDUCERS
Accession Number: 00495075
Record Type: Component
Availability: Find a library where document is available Abstract: The analytical models used to design and rehabilitate pavements are becoming more sophisticated. The most appropriate process for verifying the accuracy and usefulness of these new analytical models (as well as for calibrating the parameters involved in these models) is to observe the behavior of pavements in the field. Unfortunately, few devices or techniques are available for determining the displacement of a pavement section under actual loads. In addition, the available methods for monitoring the performance of pavements in terms of displacement are expensive and/or inaccurate. One economical alternative is the use of velocity transducers (geophones). Geophones are quite inexpensive and readily available. In additon, if used properly, geophones can provide quite accurate deflection-time histories. The methodology involved in determining deflection from geophones is complex. Proper mathematical manipulation of the geophone record, using signal analysis techniques and theory of vibration, should be carried out so that the deflection-time history can be accurately determined. Fortunately, the necessary mathematical manipulation can be programmed into a portable microcomputer so that the deflection-time history can be obtained rapidly in the field. This paper presents an overview of theoretical alternatives available for determining the deflection-time history of pavements using geophones. The limitations and advantages of each alternative are discussed. The practical problems that should be addressed in developing a proper algorithm for each alternative are also included. Through an illustrative example and a case study, the versatility of using geophones as a tool for determining the deflection-time history of pavements is demonstrated.
Supplemental Notes: This paper appears in Transportation Research Record No. 1227, Rigid and Flexible Pavement Design and Analysis: Unbound Granular Materials, Tire Pressures, Backcalculation, and Design Methods. 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
Monograph Title: Monograph Accession #: 01414206
Authors: Nazarian, SoheilBush III, Albert JPagination: p. 147-158
Publication Date: 1989
Serial: ISBN: 0309048222
Features: Figures
(19)
; References
(5)
; Tables
(3)
TRT Terms: Old TRIS Terms: Subject Areas: Highways; Pavements; I23: Properties of Road Surfaces
Files: TRIS, TRB, ATRI
Created Date: Jun 30 1990 12:00AM
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