Numerical study of built-up double-Z members in bending and compression

作者：Georgieva Iveta^*; Schueremans Luc; Pyl Lincy; Vandewalle Lucie

来源：Thin-Walled Structures, 2012, 60: 85-97.

DOI：10.1016/j.tws.2012.07.005

• Cold-formed steel
• Built-up sections
• Finite element method
• Portal frames
• Experimental validation
• Distortional buckling
• Torsional-flexural buckling

The use of the finite element method (FEM) for the design of composed, thin-walled, structural steel members is considered. The bolted double-Z frame member is an interesting and economical engineering solution, already used in practice [1]. However, the European recommendations for the design of steel structures do not consider built-up members from cold-formed steel profiles. Finite element analysis is used to capture the various buckling effects that shape the response of slender thin-walled members. From the finite element model, the importance of initial imperfections and stiffness of connections is identified. The experimentally validated model predictions show that a non-linear finite element analysis can predict the member behaviour, in terms of failure mode and ultimate load, yield line pattern, overall stiffness and local strain in the cold-formed profiles. To obtain a good prediction, overall and localised initial imperfections should be considered and included in the analysis.

• 出版日期2012-11