An experimental and theoretical investigation of the stress analysis of a simply supported twin-spin box-girder model is reported. The model, fabricated from filled-epoxy castings was heavily straingauged on inside and outside surfaces of the central cross-section, and in the vicinity of one end diaphragm. Stresses measured under a number of loading cases, including prestress and live loading, are fully reported. The prestress results show that excellent experimental accuracy was obtained. Stresses and deflections induced by three separate load conditions were predicted by six different analytical techniques, including a three- dimensional finite element method, finite-strip and folded-plate analyses, a two-dimensional grid analysis with superimposed plate-bending finite elements, a beam on elastic foundation analogy, and an equivalent grillage. Results from the analyses are compared with experimental results to assess the relative capabilities of the analytical methods. The three-dimensional finite element method gave the best representation of actual behaviour. The three-dimensional plate methods also gave excellent results except near points of loading where considerable errors existed. It appears that these errors can be largely eliminated by improvement of the joint simulation. Adequate representation of experimental behaviour was obtained from the two-dimensional finite element plus grid, and the beam on elastic foundation analogy, but the equivalent grillage method significantly underestimated transverse stresses and transverse distribution of longitudinal stresses. /Author/

  • Corporate Authors:

    National Roads Board, New Zealand

    P.O. Box 12-041
    Wellington,   New Zealand 
  • Authors:
    • Priestley, MJN
  • Publication Date: 1975

Media Info

  • Features: Figures; References;
  • Pagination: 46 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00151960
  • Record Type: Publication
  • Report/Paper Numbers: Road Res Unit Bul 30Monograph
  • Files: TRIS, ATRI
  • Created Date: Jun 22 1977 12:00AM