An experimental investigation was made of the elastic and inelastic lateral buckling of unbraced two-span continuous steel I-beams with midspan concentrated loads. A related theorectical study of the in elastic in-plane bending of continuous beams showed that the moment redistribution is smaller and more gradual than predicted by simple rigid-plastic theory because of strain-hardening and residual stresses. The results of six elastic buckling tests on one beam were in close agreement with theoretical predictions, and confirmed the reliability of the test apparatus. The results of eight in elastic buckling tests on for beams provide useful data for evaluating theoretical investigations of inelastic lateral buckling. The experimental failure laods were significantly less than the plastic collapse loads, and much less than the elastic buckling loads. They were also somewhat less than those of comparable simply supported beams, and it was suggested that this may be due to the inplane moment redistribution which takes place in indeterminate beams. It was concluded that further tests should be made to investigate in-plane moment redistribution more fully. /Author/

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  • Corporate Authors:

    Institution of Engineers

    Science House, Gloucester and Essex Streets
    Sydney,   Australia 
  • Authors:
    • Poowannachaikul, T
    • Trahair, N S
  • Publication Date: 1976

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  • Accession Number: 00165827
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 13 1978 12:00AM