Ductility in cross-section behaviour is a necessary requirement for plastic design. It is also a desirable condition in all design since ductile structures give warning of impending collapse. The chief aim of this paper is to define the conditions required for a composite beam to exhibit ductile sagging behaviour. The variations in the elastic and inelastic response of a composite beam in sagging bending are studied. The effects of material properties, geometry, residual stresses and interface slip are all examined. From a wide range of cross-sections, the form of a standard moment-curvature curve is determined. Simple analytical expressions are derived which give an approximate but quite accurate prediction of the form of the complete curve throughout the elastic and inelastic range. The criterion which determines whether a beam is ductile or strain-softening is deduced directly from this simple analysis. The ductility criterion developed here is shown to be accurate and is very simple to apply. It is not very restrictive on designs and enables the designer to achieve a ductile design quickly. (a) This report is also issued as Australian Road Research Board Internal Report Air 076-11. /TRRL/

  • Corporate Authors:

    University of Sydney

    School of Civil Engineering, Parramatta Road
    Sydney, New South Wales  Australia  2006
  • Authors:
    • Rotter, J M
    • Ansourian, P
  • Publication Date: 1978-9

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 48 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00194029
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Research Rpt. 329 Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: May 26 1979 12:00AM