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THE INFLUENCE OF MATERIAL PROPERTIES ON THE PLASTIC HINGE ROTATION AND DEFLECTION OF AN ELASTICALLY RESTRAINED BEAM LOADED AT THE CENTER

The use of hot-rolled Universal beam and column sections in structures designed on the basis of simple plastic theory is at present restricted by limits to the flange width/thickness (B/T) ratio. The limits are based on an empirical formula, designed to avoid premature plastic buckling of the compression flange when a plastic hinge forms and is then required to undergo rotation while plastic hinges develop at further points. This report examines the plastic hinge rotation requirements for the severe case of a beam elastically restrained at its ends and loaded by a concentrated load at the centre. The theoretical solution has been compared with measured results obtained from a full-scale frame test, and then subsequently used to determine the effects of the stiffness and material properties on the rotational requirements of the hinges. For structures designed on the basis of assumed simple plastic theory, the results show that limiting values must be placed on the permissible ratio of beam/restraint stiffness, together with limits on the section flange width/thickness ratio if realistic hinge rotation requirements are to be obtained. Furthermore, these limits may vary according to the plastic and strain-hardening properties of the material used.

  • Corporate Authors:

    British Iron and Steel Research Association

    24 Buckingham Gate
    London SW1,   England 
  • Authors:
    • Dibley, J E
  • Publication Date: 1971

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 36 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00033664
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: EG/12/71
  • Files: TRIS
  • Created Date: Jul 28 1973 12:00AM