Cold-formed steel columns undergoing local–distortional coupling: Behaviour and direct strength prediction against interactive failure. (15th January 2015)

• Record Type: Journal Article
• Authors: Dinis, P.B.; Camotim, D.
• Is Part Of: Computers & structures. Volume 147(2015)
• Page Start: 181
• Page End: 208
• Publication Date: 2015-01-15
• Subjects: Cold-formed steel columns -- Local–distortional interaction -- Lipped channels -- Hat, zed and rack-sections -- Ultimate strength -- Direct Strength Method (DSM); Structural engineering -- Data processing -- Periodicals; Electronic data processing -- Structures, Theory of -- Periodicals; 624.171
• DOI: 10.1016/j.compstruc.2014.09.012
• Languages: English
• ISSNs: 0045-7949

Abstract

Abstract: This paper reports the results of an investigation on the structural behaviour and Direct Strength Method (DSM) design of cold-formed steel columns affected by local–distortional coupling interaction, aimed at extending findings unveiled earlier for lipped channels to other cross-section shapes, namely, hat, zed and rack-sections. Following a brief presentation of the most relevant aspects concerning the post-buckling behaviour and strength of columns with those cross-section shapes and identical local and distortional critical buckling stresses, the paper addresses the assembly of a significant column ultimate strength data bank, concerning fixed-ended hat, zed and rack-section columns undergoing strong local–distortional interaction and exhibiting several geometries (cross-section dimensions and lengths) and yield stresses. Then, these ultimate strength data are used to assess the performance of the existing DSM approaches to design columns against local–distortional interactive failures. It is shown that a novel DSM design approach, recently developed and validated in the context of cold-formed steel fixed-ended lipped channel columns affected by local–distortional interaction, can also be successfully applied to hat, zed and rack-section columns under the same circumstances ( i.e., exhibiting similar interactive failures).