THE BEHAVIOUR OF COMPOSITE COLUMNS UNDER LONG TERM LOADING

The results are presented of an investigation into the influence of creep and shrinkage on the sustained load behaviour of pin-ended composite columns. Tests were performed on built-up composite columns containing two steel channels without battens and encased in unreinforced concrete. The loads were sustained for periods up to four years. Basic creep and shrinkage tests, the results of which are reported, were carried out to provide data for the proposed analysis. The observed deformations with them were compared with theoretical predictions from an iterative inelastic analysis based on the rate of creep method. With confirmation of the analytical predictions, the analysis was extended to produce complete load-deformation-time relationships for the test columns. The results show that the sustained load capacity of composite columns is reduced with time under load, the most severe case being the pin-ended column bent in single curvature and loaded at the same time drying, and hence shrinkage, commences. A lower bound to the capacity is that of the steel core alone ignoring the concrete. (a) this is also issued as Australian road research board internal report air 076-9. /TRRL/

  • Corporate Authors:

    University of Sydney

    School of Civil Engineering, Parramatta Road
    Sydney, New South Wales  Australia  2006
  • Authors:
    • Bridge, R Q
  • Publication Date: 1978-5

Language

  • English

Media Info

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

Subject/Index Terms

Filing Info

  • Accession Number: 00184414
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Research Rpt R321 Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jan 13 1979 12:00AM