An analytical solution of distortional buckling resistance of cold-formed steel channel-section beams with web openings. (February 2019)

• Record Type: Journal Article
• Authors: Yu, Nan-ting; Kim, Boksun; Yuan, Wei-bin; Li, Long-yuan; Yu, Feng
• Is Part Of: Thin-walled structures. Volume 135(2019)
• Page Start: 446
• Page End: 452
• Publication Date: 2019-02
• Subjects: Cold-formed steel -- Channel section -- Distortional buckling -- Circular openings -- Analytical solution -- Finite element analysis; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2018.11.012
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: Circular holes can be commonly found in the web of cold-formed steel beams to accommodate services such as electric wires and pipelines. The presence of holes will reduce the critical buckling stress of the beams. Hancock proposed solution for determining the distortional critical stress of channel section beams, but limited to the sections without holes. This paper presents an analytical study on the distortional buckling of cold-formed steel channel-section beams with circular holes in the web. Hancock's solution has been modified to derive a simple formulation for approximating the elastic critical stress and moment of distortional buckling of the channel-section beams with circular holes in the web, which are compared with those from the finite element buckling analysis using ANSYS. Finally, the influence of multiple holes on the distortional buckling behaviour and corresponding elastic buckling stress of beams in bending is discussed. Highlights: The distortional buckling behaviour of perforated cold-formed beams is studied. An analytical model is developed for calculating critical moment. Finite element analyses are used to simulate the distortional buckling behaviour. The proposed approach shows good agreement with finite element analyses. Comparison is made with the method available in the literature.