VIBRATION AND DEFLECTION OF ROLLED-BEAM AND PLATE-GIRDER BRIDGES

OBSERVATIONS ARE REPORTED ON THE VIBRATION AND DEFLECTION CHARACTERISTICS ON AN EIGHT-SPAN PLATE GIRDER BRIDGE CONSISTING OF FIVE SIMPLE SPANS AND THREE SPANS OF CONTINUOUS BEAM DESIGN, AND A CONTINUATION OF THE VIBRATION AND DEFLECTION STUDIES ON THE FENNVILLE BRIDGE, WHICH WAS PREVIOUSLY REPORTED. THE LATTER BRIDGE CONSISTS OF SIX SIMPLE SPANS OF ROLLED BEAM CONSTRUCTION WITH CONCRETE DECKING. ONE OF THESE SPANS WAS BUILT WITH COMPOSITE CONSTRUCTION. THREE TYPES OF LOADING WERE USED--NORMAL COMMERCIAL TRUCK TRAFFIC WITH A MINIMUM OF CONTROL, CONTROLLED TESTING WITH TWO-AXLE TRUCKS, AND CONTROLLED TESTING WITH A SPECIAL THREE-AXLE TRUCK WITH AXLE SPACING IDENTICAL TO THAT FOR H20-S16 BRIDGE LOADING. OBSERVATIONS ARE REPORTED ON THE FREQUENCY OF VIBRATION, THE AMPLITUDE AND DURATION OF VIBRATION, AND THE DEFLECTION FOR THESE SPANS UNDER SIMILAR LOADING CONDITIONS. THE LATERAL DISTRIBUTION OF THE VIBRATION AND DEFLECTION AMONG THE LONGITUDINAL BEAMS IS SHOWN FOR SEVERAL ROLLED BEAM SPANS. A METHOD IS PRESENTED FOR CALCULATING THE NATURAL FREQUENCY OF A HIGHWAY SPAN WHICH CHECKS THE OBSERVATIONS WITHIN APPROXIMATELY THREE PERCENT. THE OCCURRENCE OF APPRECIABLE VIBRATION IS CORRELATED WITH THE TYPE, GROSS WEIGHT, AXLE SPACING, AND SPEED OF THE VEHICLE CAUSING VIBRATION. OTHER FACTORS INFLUENCING VIBRATION ARE DISCUSSED - FOR EXAMPLE, THE EFFECT OF VEHICLE SEQUENCE ON VIBRATIONS AND THE EFFECT OF INDUCED IMPACT. THE DIFFERENCES IN BEHAVIOR OF THE VARIOUS SPANS ARE CORRELATED WITH PRESENT DESIGN CRITERIA, THAT IS, DESIGN LIVE LOAD PLUS IMPACT DEFLECTION AND DEPTH TO SPAN LENGTH RATIOS. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/124/124-005.pdf
• Supplemental Notes:
  • No 124, pp 79-110, 26 FIG, 14 TAB, 5 REF 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:
  • Foster, George M
  • Oehler, LeRoy T
• Publication Date: 1956

Media Info

• Media Type: Digital/other
• Pagination: 32p
• Monograph Title: Vibration and stresses in girder bridges
• Serial:
  • Highway Research Board Bulletin
  • Issue Number: 124
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Axle load force; Axles; Beams; Bridge decks; Bridge superstructures; Composite construction; Concrete; Continuous structures; Deflection; Girder bridges; Highway bridges; Load tests; Motion; Motor vehicles; Plate girders; Spacing; Tandem axle loads; Trucks; Vibration
• Uncontrolled Terms: Bridge spans; Continuous beams; Moving vehicles
• Old TRIS Terms: Simple span; Tandem axles
• Subject Areas: Bridges and other structures; Highways; Motor Carriers;

Filing Info

• Accession Number: 00208835
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Dec 9 1994 12:00AM