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Structural Engineering and Mechanics
  Volume 28, Number 2, January30 2008, pages 189-206

Effective lengths of braced frame columns
Konuralp Girgin and Gunay Ozmen

    In several design codes and specifications, simplified formulae and charts are given for determining the effective lengths of frame columns. It is shown that these formulae may yield rather
erroneous results in certain cases. 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 braced frames is developed. The procedure utilises a fictitious load analysis of frames and yields errors less than 10%, 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.
Key Words
    buckling load; buckling length; effective length; non-sway mode; braced frames; isolated subassembly; multi-storey frames; design codes.
Konuralp Girgin and Gunay Ozmen: Faculty of Civil Engineering, Istanbul Technical University, Maslak 34469, Istanbul, Turkey

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