Buckling lengths of irregular frame columns

Konuralp Girgin*, Gunay Ozmen, Engin Orakdogen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


In several design codes and specifications, simplified formulae and diagrams are given for determining the buckling lengths of frame columns. It is shown that these formulae may yield rather erroneous results, especially for irregular frames. This is due to the fact that the code formulae utilise only local stiffness distributions. In this paper, a simplified procedure for determining approximate values for the buckling loads of both regular and irregular frames is developed. The procedure utilises lateral load analysis of frames and yields errors on the order of 5%, which may be considered suitable for design purposes. The proposed procedure is applied to several numerical examples and it is shown that all the errors are in the acceptable range and on the safe side.

Original languageEnglish
Pages (from-to)605-613
Number of pages9
JournalJournal of Constructional Steel Research
Issue number6
Publication statusPublished - Jun 2006


  • Buckling length
  • Buckling load
  • Design codes
  • Effective length
  • Irregular frames
  • Isolated subassembly
  • Sway mode
  • Unbraced frames


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