Global Buckling of Frames with Laced Compression Members

Abstract:

The planar frames whose members consist of a laced built-up members are often used in civil engineering practice. For chords of these structures the 1^st order theory internal forces and the assessment by equivalent column method are mostly used. In the equivalent column method the buckling length according to the global buckling mode of the structures should be used. If the distance between neighboring nodes is used as the buckling length of the chord, which is the common case, the second order effects with only the bow imperfections between nodes are taken into account in the equivalent column method. For frames sensitive to buckling in a sway mode the second order effects on structures with initial sway imperfection should be taken into account. Therefore, also in frames with the laced compression columns, where the effects of additional sway deformation cause additional normal forces in the chords, the sway imperfection should be applied and the second order in frame analysis should be performed to check these additive forces. This paper deals with the simplified procedure how to evaluate additive forces due to second order effects on the structure with the global sway imperfection.

• Periodical: Applied Mechanics and Materials (Volume 837)
• Pages: 103-108
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.837.103
• Online since: June 2016
• Authors: Michal Kovac*, Zsuzsanna Vanik
• Keywords: Global in Frame Buckling Mode, Imperfection, Laced Compression Member, Metal Planar Frame, Second Order Theory

References

[1] EN 1993-1-1, Design of steel structures - General rules and rules for buildings, CEN, Brussels, (2005).