INFLUENCE OF CROSS-SECTIONAL SHAPE ON THE VALUES OF THE CRITICAL BUCKLING FORCE

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-21-6 / ISSN 1314-2704, June 19-25, 2014, Book 6, Vol. 2, 219-226 pp

ABSTRACT
The relevant buckling mode for hot-rolled steel members, with the type of crosssections commonly used for compression members is generally flexural buckling; however, in some cases, torsional or flexural-torsional modes may govern and they must be investigated for all sections with small torsional resistance. In this paper, after a brief presentation of the aspects regarding the calculation of the critical buckling force, a series of compressed members having a class 4 cross-section are analysed according to the European norms EN 1993-1-1: Design of steel structures. Afterwards, the members are modelled in Abaqus and a comparison is made with the results obtained based on the design method given in the Euronorms. Six constructive solutions for open cross-sections are taken into account and the buckling mode and the values of the critical buckling force are analysed. Conclusions are drawn regarding the efficiency of each type of cross-section regarding the critical buckling force. It can be seen that for classical types of cross-sections the buckling mode is flexural-torsional, for a double symmetrical cross-section, with the highest efficiency to buckling, the buckling mode is flexural and for a cross shape crosssection the buckling mode is torsional.

Keywords: buckling resistance, compression members, comparative analysis, critical buckling force