Local buckling resistances of cold-formed high-strength steel SHS and RHS with varying corner radius. (March 2022)

• Record Type: Journal Article
• Authors: Yang, Lu; Yin, Fei; Wang, Jie; Bilal, Azrat; Ahmed, Ari Habeeb; Lin, Manfang
• Is Part Of: Thin-walled structures. Volume 172(2022)
• Publication Date: 2022-03
• Subjects: Cold-formed steel structures -- Effect of corner radius -- High strength steels -- Local buckling -- Square and rectangular hollow sections (SHS and RHS) -- Stub column tests -- 3-point bending tests -- 4-point bending tests; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2022.108909
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: This paper reports an experimental and numerical study of the cross-sectional behaviour of cold-formed high-strength steel (HSS) square and rectangular hollow section (SHS and RHS) members. Six stub column tests, six 3-point and three 4-point bending tests have been carried out, followed by the development of accurate finite element (FE) models and a parametric study. Based on the test and FE results, the design rules for slender cross-sections in European, American, Australian and Chinese standards and the GSRM method have been assessed via reliability analyses. A new equation for deriving the cross-sectional slenderness of SHS and RHS considering the influence of corner radius and new area reduction factors for designing slender cold-formed S900 (and above) SHS and RHS have also been proposed. Highlights: A testing programme comprising of tensile tests, geometric imperfection measurement, stub column tests and bending tests. A numerical parametric study considering extended steel grades and various cross-sectional geometries. Current standards assessed via reliability analyses. GSRM extended to cover the design of cold-formed HSS cross-sections with steel grades above S900. New hand-calculation method for deriving cross-sectional slenderness considering the effect of corner radius.