DYNAMIC PROPERTIES OF SUSPENSION BRIDGES

EXPERIMENTAL DETERMINATION OF THE NATURAL FREQUENCIES OF VIBRATION, THE VERTICAL AND TORSIONAL MODE SHAPES, AND THE MODAL DAMPING OF THE NEWPORT BRIDGE, RHODE ISLAND, AND THE WILLIAM PRESTON LANE MEMORIAL BRIDGE, MARYLAND IS BRIEFLY DESCRIBED. THE RESULTS OF THE TWO MEASUREMENTS ARE COMPARED TO SHOW FUNDAMENTAL SIMILARITIES IN THEIR DYNAMIC BEHAVIOR. THE SIMILARITIES INCLUDE THE ORDER THAT THE TYPES OF MOTION OF THE DECK OCCUR. THIS ORDER IS AS FOLLOWS: SYMMETRIC VERTICAL, ANTISYMMETRIC VERTICAL, ANTISYMMETRIC VERTICAL, SYMMETRIC VERTICAL, SYMMETRIC VERTICAL, SYMMETRIC TORSIONAL AND ANTISYMMETRIC VERTICAL. THE RATIOS OF HIGHER ORDER MODAL FREQUENCIES TO THE LOWEST MODAL FREQUENCIES ARE GRAPHED. THE MEAN RATIOS ON THE TWO BRIDGES ARE FOUND TO AGREE WITHIN 10 PERCENT. THESE FACTORS MAY SERVE AS USEFUL RULES OF THUMB DURING THE DESIGN OF SUSPENSION BRIDGES. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1971/354/354-004.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309019672
• Supplemental Notes:
  • Sponsored by Committee on Dynamics and Field Testing of Bridges and presented at the 50th 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.
• Authors:
  • McLamore, V R
  • Stubbs, Ian R
  • Hart, Gary C
• Conference:
  • 50th Annual Meeting of the Highway Research Board
  • Location: Washington District of Columbia, United States
  • Date: 1971-1-18 to 1971-1-22
• Publication Date: 1971

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 45-53
• Monograph Title: Bridges and Bridge Foundations
• Serial:
  • Highway Research Record
  • Issue Number: 354
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Alternatives analysis; Damping (Physics); Dynamics; Mode S; Natural frequency; Suspension bridges; Vibration
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209554
• Record Type: Publication
• ISBN: 0309019672
• Files: TRIS, TRB
• Created Date: Jan 12 1972 12:00AM