STABILITY ANALYSIS OF BOX GIRDERS

A non-linear analysis computer program (using the finite element) based on a modified Newton-Raphson technique is described, which is capable of determining the critical load of arbitrarily shaped closed or open thin-walled sections under arbitrary loads. At the critical lead levels, a suggested iterative technique can be employed to determine the eigenvectors representing the buckling mode of such vectors. Large deflection and non-linear geometry concepts have been employed in the derivation of the shiftness matrix of a flat quadrilateral swell element under the combined action of in-plane and lateral action. The validity of the program was checked. The results of the study indicate that the behavior of the flat plate assemblage of which the box is composed is not dissimilar to that observed in the buckling of thin-walled shell structures. Details are given of the computer program, stability of a thin plate, and the cantilevered box girder.

  • Supplemental Notes:
    • Paper available in the proceedings of the seminar on Bridge Analysis and Design ($15.75), held during the PTRC Summer Annual Meeting, July 8-12, 1974, at the University of Warwick, England.
  • Corporate Authors:

    Planning and Transport Res and Computation Co Ltd

    167 Oxford Street
    London W1R 1AH,   England 
  • Authors:
    • Bunni, U K
    • Supple, W J
  • Publication Date: 1974-7

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Filing Info

  • Accession Number: 00096494
  • Record Type: Publication
  • Report/Paper Numbers: PTRC/P/111 Proceeding
  • Files: TRIS
  • Created Date: Aug 13 1975 12:00AM