Three-Dimensional Finite Element Analysis for Traffic-Induced Vibration of a Two-Girder Steel Bridge with Elastomeric Bearings

A three-dimensional traffic-induced dynamic response analysis of a two-span continuous two-girder steel highway bridge seated on elastomeric bearings was used to investigate the dynamic responses of local bridge members such as decks and web plates. The validity of the numerical procedure was verified by comparison of the data obtained by the procedure with data obtained in a field test. A bump that develops between the rigid surface of the approaching part of the bridge and the elastic deformation of the elastomeric supports at the instant that a vehicle enters the bridge induces an impulsive energy on the vehicle. Consequently, it affects the dynamic response of the bridge. This investigation shows that the lower torsional rigidity of two-girder bridges compared with that of conventional multigirder bridges renders the bridge susceptible to vibration because vehicles run on the cantilever part of the bridge deck. In addition, this analysis demonstrates that the out-of-plane dynamic response of the web plate is easily affected by the deck deformation caused by vehicles running between two girders. The dynamic property of the web plate connected with crossbeams is strongly affected by the dynamic characteristics of the entire motion of the bridge as well as the pitching and bouncing motions of heavy vehicles. The response of the web plate apart from that of the crossbeams, however, is dominated by dynamic sources with higher-frequency features, such as the axle-hop motion of vehicles.

Language

  • English

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Filing Info

  • Accession Number: 01002443
  • Record Type: Publication
  • ISBN: 0309093813
  • Files: TRIS, TRB
  • Created Date: Jul 22 2005 11:34AM