DYNAMIC INTERACTION OF A THREE-AXLE VEHICLE AND A TWO-SPAN, PARTIALLY CONTINUOUS PRESTRESSED CONCRETE BRIDGE
A FIELD STUDY AND A THEORETICAL ANALYSIS HAVE BEEN MADE OF THE RESPONSES OF A HEAVILY LOADED THREE-AXLE VEHICLE AND A TWO-SPAN, PARTIALLY CONTINUOUS PRESTRESSED CONCRETE BRIDGE. DYNAMIC RESPONSES WERE OBTAINED BY CROSSINGS OF THE HEAVY TEST VEHICLE OVER THE BRIDGE ON PRESCRIBED PATHS AT SPEEDS RANGING FROM CRAWL TO 50 MPH IN 5-MPH INCREMENTS. THE DYNAMIC WHEEL FORCE VARIATIONS OF THE TEST VEHICLE WERE MEASURED AT THE SAME TIME THAT THE DISPLACEMENTS AND STRAINS AT SELECTED POINTS ON THE STRUCTURE WERE BEING MONITORED. THE THEORETICAL RESULTS ARE BASED ON A COMPUTER ROUTINE UTILIZING NUMERICAL-ANALYSIS METHODS. THE EXPERIMENTALLY DETERMINED MODE SHAPES AND FREQUENCIES COMPARE FAVORABLY WITH THE PREDICTED VALUES BASED ON THE THEORETICAL ANALYSIS. VARIATIONS IN THE DYNAMIC WHEEL FORCES OF THE TEST VEHICLE WERE FOUND TO HAVE LITTLE INFLUENCE ON THE DYNAMIC RESPONSES OF THE BRIDGE. THE PARTICULAR VIBRATION RESPONSE MODE INDUCED BY THE TEST VEHICLE ENTERING UPON THE BRIDGE WAS THE FACTOR OF MOST SIGNIFICANCE IN BRINGING ABOUT PEAK LIVE-LOAD RESPONSES IN THE BRIDGE. PEAK LIVE-LOAD RESPONSES WERE ALSO FOUND TO BE ESSENTIALLY INDEPENDENT OF THE PRECISE LOCATION OF THE TEST VEHICLE AT THE INSTANT OF OCCURANCE. /AUTHOR/
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Supplemental Notes:
- Paper sponsored by Committee on Field Testing of Bridges. 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:
- Varney, Robert F
- Publication Date: 1969
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: pp 128-139
- Monograph Title: Bridges
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Serial:
- Highway Research Record
- Issue Number: 295
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Bridge superstructures; Concrete bridges; Continuous structures; Dislocation (Geology); Dynamic loads; Field studies; Live loads; Motion; Motor vehicles; Prestressed concrete; Strain measurement; Theory; Vibration
- Uncontrolled Terms: Bridge spans; Dynamic response; Moving vehicles
- Subject Areas: Bridges and other structures; Highways;
Filing Info
- Accession Number: 00209154
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Mar 9 1970 12:00AM