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IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints


IASS Symposium 2014

SESSION: General 4: Structural Stability

Unique global and local initial imperfection in the shape of the elastic buckling mode (Application of “UGLI” imperfection method for frames with class 4 cross-sections)

< Table of Contents for General 4: Structural Stability
  • Proceedings Name: IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints
  • ISSN: (Electronic Version) 2518-6582
  • Session: General 4: Structural Stability
  • Title: Unique global and local initial imperfection in the shape of the elastic buckling mode (Application of “UGLI” imperfection method for frames with class 4 cross-sections)
  • Author(s): Ján BRODNIANSKY, Rudolf ÁROCH
  • Keywords: Unique global and local initial imperfection, elastic critical buckling mode, UGLI, EUGLI, class 4 cross-section
Abstract
The resistance of frames with axially loaded members can be, according to EN 1993-1-1: 2005, assessed by using an equivalent unique global and local initial imperfection (UGLI or EUGLI imperfection) in the shape of the elastic critical buckling mode of the structure, following by the calculation of internal forces and moments by means of the second order theory and finally by verifying the resistance of the individual cross-sections. The basic idea behind this approach is that the imperfections exercise the most adverse effect on the structure when they have the shape of the elastic critical buckling mode. The method and the value of the amplitude, developed by Prof. Chladný, can be found in 5.3.2(11) in EN 1993-1-1: 2005 and was later generalized also for non-uniform cross-sections and/or non-uniform compression forces in 5.3.2(11) in EN 1999-1-1: 2005.

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