THE FULL SCALE EXPERIMENTAL VERIFICATION OF AN ANALYTICAL MODEL FOR EVALUATING METHODS OF SUPPRESSING EXCESSIVE BRIDGE VIBRATIONS

This report describes the design, installation and testing of a passive, damped and tuned vibration absorber for reducing the dynamic responses of a specific simple span bridge during and following the passage of a vehicle. In addition, the experimentally measured effectiveness of the vibration absorbers was compared with the predicted results from a computerized theoretical model in which the bridge is considered as an equivalent simply supported beam with damping. The vibration absorber system which was installed on the underside of the 97 foot span steel girder two-lane bridge weighed 32,000 pounds. The field testing involved the measurement of bridge dynamic responses before and after installation of the absorber. Bridge excitation was induced by the passages of a 3-axle vehicle in various lanes, at various speeds and with various loads. Although the overall average bridge vibration reduction was lower than predicted, the measured strains, displacements and accelerations of the bridge were reduced significantly on certain vehicle runs. The damping of residual bridge vibrations was also appreciably increased. The research findings indicated the need for more sophisticated analytical models for the bridge/absorber/ vehicle system to permit the improved design of specific passive vibration absorbers. Provision for adjustable field tuning and/or damping in the individual components of the vibration absorber system could also increase the effectiveness. Further tests of this nature on more flexible spans would also serve to define the absorber effectiveness more precisely. /FHWA/

  • Corporate Authors:

    White (Barry) Corporation

    700 Pleasant Street
    Watertown, MA  USA  02172
  • Authors:
    • Siwiecki, K J
  • Publication Date: 1972-11

Media Info

  • Pagination: 149 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00265063
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-72- 45 Final Rpt., FCP 35G4-022
  • Contract Numbers: DOT-FH-11-7799
  • Files: TRIS, USDOT
  • Created Date: Jan 9 1988 12:00AM