thInternational Conference ENGINEERING （thInternational工程会议）.pdf

. 18 International Conference m ENGINEERING MECHANICS 2012 pp. 61–86 2012 Svratka, Czech Republic, May 14 – 17, 2012 Paper #233 STRUCTURES WITH UGLI IMPERFECTIONS * ** I. Baláž , Y. Koleková Abstract: Derivation of the basic formulae for determination of the flexural buckling resistance of frames with members with non-uniform cross-sections and/or non-uniform axial compression forces. Similar formulae given in EN 1993-1-1 (2005) are limited to frames with uniform cross-sections and compression forces. Detailed description of the procedure of iterative calculation (Baláž, I., 2008). Graphical interpretation of the method proposed by the authors and numerical examples for members with uniform cross-sections and uniform axial compression forces. Keywords: stability, metal structures, flexural buckling resistance, imperfections in the form of first buckling mode. 1. Introduction The proposed procedure was the first time published in Baláž, I. (2008) and was verified by calculating of several numerical examples. The procedure is based on Chladný`s method. Derivation of the basic formulae used in this paper differ from the ones published by Chladný in publication Baláž, I. et al. (2007, 2010). The way of calculation proposed by Baláž, I. (2008) was used also in PhD thesis written by Kováč, M. (2010). Prof. Chladný developed his method with the aim to derive a formula for the lateral forces acting on U-frames of open truss bridges in Chladný, E. (1958) and in Chladný, E. (1974). He showed there the impor