A design criterion for identifying and designing compressive cold-formed steel members with local and distortional interactive behaviors. (March 2020)

• Record Type: Journal Article
• Authors: He, Ziqi; Zou, Bo; XuhongZhou, ; Liu, Zhanke; Li, Zhanjie
• Is Part Of: Thin-walled structures. Volume 148(2020)
• Publication Date: 2020-03
• Subjects: Distortional buckling -- Local buckling -- Local-distortional interactive failure -- Cold-formed steel -- Direct strength method; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2019.106187
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: The objective of this paper is to develop a systematical Direct Strength Method (DSM) design formulation with a design criterion that can properly identify the occurrence of the Local and Distortional (L/D) buckling interaction for cold-formed steel compressive members and thus predict the strength. Column tests provided clear evidence of the L/D interaction and revealed the difference between the L-D and D-L interactions depending on which one buckles first. By collecting all the experimental data of cold-formed steel columns related to the L/D interaction, the current DSM predictions are first evaluated. Then, a DSM-based interaction formulation with design criterion by replacing the pure mode prediction with the interaction prediction based on the identification of the design criterion is proposed. The accuracy of the proposed method is evaluated from all the collected data experiencing the L/D interaction. Moreover, the effectiveness of the design criterion in identifying the interactive failure is also highlighted. Highlights: Provide experimental evidence of two types of local and distortional interactions. Propose a design criterion to identify the local and distortional interaction of cold-formed steel columns. Evaluate the Direct Strength Method based on the local and distortional interaction formulation with the design criterion. Demonstrate the effective of the proposed design criterion for identifying the local and distortional interaction.