The static and dynamic behaviour of a three-span continuous beam subjected to multiple independent axial forces is examined. The two central supports can be considered elastically flexible, in order to simulate the real piers of a girder bridge, while the cross section and inertia of the beam can vary according to a generic (even discontinuous) law. The actual value of the stiffness of the central supports cannot be exactly detected, hence the evolution of stability boundaries and fundamental characteristic surfaces is examined for various stiffness values. The forced dynamics of the system are also studied, where the forcing term is given by a synchronous motion of the four supports, or by a simple motion of a single support. This last forcing term can easily represent a seismic excitation if the span of the bridge is large. Finally, a numerical example is given, in which a recently built three-span continuous bridge is examined. (Author/TRRL)

  • Availability:
  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,    
  • Authors:
    • De ROSA, M A
  • Publication Date: 1989

Media Info

  • Features: References;
  • Pagination: p. 473-486
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00493215
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: May 31 1990 12:00AM