TESTING AND ANALYSIS OF A CONTINUOUS PRESTRESSED CONCRETE BOX GIRDER BRIDGE

This report describes the comparison between theory and experiment for the live-load behaviour of a complex prestressed concrete box-girder bridge, tested in situ. The bridge, of two spans, each of which was nonprismatic with variations in section depth as well as web and soffit slab thickness, had an unusual section changing from 3 cells for the longer portion of each span to 5 cells in the vicinity of the central support, by means of an inclined slab running between deck and soffit slabs. The bridge was instrumented with a large number of vibrating wire strain gauges, resistance thermometers, and especially designed deflection gauges. Full details of instrumentation are included. Loading consisted of 4-180 kN concrete kentledge blocks, simulating the NZ HN-HO-72 overload element with a 50% impact factor. Recorded strains and deflections were compared with values predicted by four analysis methods ranging in decreasing complexity from a 3-D Finite Element analysis to an Equivalent Grillage analysis. These methods also represented the extremes of accuracy in the results, but a Beam on Elastic Foundation analysis, based on many simplifying assumptions, gave very good results. Full experimental data are tabulated in an Appendix to this report. (Author)

  • Corporate Authors:

    National Roads Board, New Zealand

    P.O. Box 12-041
    Wellington,   New Zealand 
  • Authors:
    • Priestley, MJN
  • Publication Date: 1981

Media Info

  • Features: Appendices; Figures; Photos; References;
  • Pagination: 47 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00345373
  • Record Type: Publication
  • Report/Paper Numbers: RRU Bull. 53
  • Files: TRIS, ATRI
  • Created Date: Jan 29 1982 12:00AM