VIBRATION STUDY OF THREE-SPAN CONTINUOUS I-BEAM BRIDGE

VIBRATION STUDY IS PRESENTED OF A THREE-SPAN CONTINUOUS I- BEAM HIGHWAY BRIDGE. THE FIELD STUDY WAS MADE DURING THE SUMMER OF 1953. DATA FROM STATIC LOADINGS AS WELL AS VIBRATION DATA FROM DYNAMIC LOADINGS ARE PRESENTED. THE SLAB WAS FOUND TO DISTRIBUTE TO THE INDIVIDUAL STRINGER ABOUT THE SAME MAGNITUDE OF LIVE LOAD AS PROVIDED FOR IN THE SPECIFICATIONS OF THE AMERICAN ASSOCIATION OF STATE HIGHWAY OFFICIALS. ALTHOUGH THE TEST STRUCTURE WAS NOT DESIGNED FOR COMPOSITE ACTION, CONSIDERABLE INTERACTION EXISTS BETWEEN THE SLAB AND THE STRINGERS IN THE CARRYING OF LIVE LOAD. CURVES ARE PRESENTED FOR USE IN COMPUTING THE NATURAL FREQUENCY OF A THREE SPAN CONTINUOUS BEAM WITH CONSTANT CROSS-SECTION. THE FREQUENCY OF APPLICATION OF AXLE LOADS AT A POINT WAS CONSIDERED AS THE FREQUENCY OF APPLICATION OF THE LIVE LOAD AS A DYNAMIC FORCE AT THAT POINT IN THE STRUCTURE. THIS IS A FUNCTION OF SPEED AND AXLE SPACING. RESONANCE OCCURS IF THE FREQUENCY OF APPLICATION OF THE AXLE LOADS AT A POINT COINCIDES WITH THE NATURAL FREQUENCY OF VIBRATION OF THAT POINT. IT IS SUGGESTED THAT, TO PREVENT UNDESIRABLE VIBRATIONS, THE NAUTRAL FREQUENCY OF VIBRATION OF THE BRIDGE, INCLUDING THE EFFECT OF THE MASS OF THE LIVE LOAD, SHOULD BE GREATER THAN THE FREQUENCY OF APPLICATION OF AXLE LOADS BASED ON A REASONABLE MAXIMUM SPEED AND AXLE SPACING. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/124/124-004.pdf
• Supplemental Notes:
  • No 124, pp 47-78, 31 FIG, 10 TAB, 8 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:
  • Hayes, John M
  • Sbarounis, John A
• 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; Bridge superstructures; Continuous girder bridges; Dynamic loads; Highway bridges; I beams; Live loads; Natural frequency; Resonance; Spacing; Speed; Static loads; Stringers; Vibration
• Uncontrolled Terms: Bridge spans
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208834
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Dec 9 1994 12:00AM