Computational & Technology Resources
an online resource for computational,
engineering & technology publications
PROCEEDINGS OF THE TENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping, J.M. Adam, F.J. Pallarés, R. Bru and M.L. Romero
Distortional Buckling of Stiffened Cold-Formed Steel Channel Sections
H.R. Naderian1, M. Azhari2 and H.R. Ronagh3
1Department of Civil Engineering, Yazd University, Iran
H.R. Naderian, M. Azhari, H.R. Ronagh, "Distortional Buckling of Stiffened Cold-Formed Steel Channel Sections", in B.H.V. Topping, J.M. Adam, F.J. Pallarés, R. Bru, M.L. Romero, (Editors), "Proceedings of the Tenth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 114, 2010. doi:10.4203/ccp.93.114
Keywords: buckling, distortional, cold-formed, channel sections, complex finite strip method, stiffened.
This paper proposes a semi-analytical complex finite strip method to analyze the distortional buckling of cold-formed steel channel section columns and beams. The main purpose of this paper is to study the buckling behavior of cold-formed channel sections with extra longitudinal stiffeners at the end of flanges and also on the web. For a better understanding of the buckling in cold-formed channel sections, the elastic local, flexural-torsional, and lateral-torsional buckling modes have also been considered in addition to distortional buckling. One of the most important purposes of this study is to investigate the optimum width of extra longitudinal flange stiffeners in cold-formed channel sections.
The critical stresses using a complex finite strip method can be evaluated by solving eigenvalue problem for each half-wavelength . It should be noted that this method result in members that are simply-supported. More complicated boundary conditions may be treated  but are not discussed here. For validation purposes, the complex finite strip method results are compared with those obtained using an analysis based on the generalized beam theory  and a virtually perfect coincidence was found.
The effect of an extra longitudinal flange stiffener on the distortional buckling behavior of channel section columns and beams is examined. It will be concluded that that the maximum distortional critical stress in stiffened C sections occurs in a specific ratio of the width of the extra stiffener to the flange width. The method is used to investigate the optimum position of the longitudinal web stiffener in cold-formed E section columns for local and distortional buckling modes. Using the semi-analytical complex finite strip method, a comparison on the buckling behavior of unstiffened and stiffened cold-formed channel sections in local, distortional and global modes will be made.
purchase the full-text of this paper (price £20)