DYNAMIC RESPONSE OF FLEXIBLY SUPPORTED HIGHWAY BRIDGES

This thesis was submitted in partial fulfilment of the requirements for the Degree of Master of Engineering Science, University of Melbourne, December 1978. It is an investigation of the effects of support flexibility on the dynamic response of highway bridges. A computer model was formulated to simulate the behaviour of a single span bridge with flexible supports under a moving load. The bridge was modelled as a prismatic beam, while the load and supports were represented by a single-axle sprung mass and linear springs respectively. A normal mode analysis was used to obtain the equations of motion, which were integrated numerically. For a practical range of bridge, bearing and vehicle parameter values, increased levels of response were predicted only for very flexible supports. Surface roughness of the bridge deck and approaches was also found to be highly significant. However, after comparison with an earlier experimental study, it was concluded that the computer model overestimated actual structure behaviour, and that the effects of support flexibility can be safely neglected in current highway bridge design. /Author/TRRL/

  • Corporate Authors:

    Melbourne University, Australia

    Grattan Street
    Parkville, Victoria 3052,   Australia 
  • Authors:
    • Moody, J R
  • Publication Date: 1978-12

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 195 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00300296
  • Record Type: Publication
  • Source Agency: ARRB Group Limited
  • Report/Paper Numbers: Thesis
  • Files: ITRD, TRIS, ATRI
  • Created Date: Oct 17 1979 12:00AM