DSM Formula for Local-Global Interaction Buckling of Cold-Formed Stainless Steel I-Beams

Yueming Yang, Shuang Niu () and Xudong Zhi
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Yueming Yang: School of Civil Engineering, Harbin Institute of Technology, Harbin 150001, China
Shuang Niu: School of Ocean Engineering, Harbin Institute of Technology at Weihai, Weihai 264200, China
Xudong Zhi: School of Civil Engineering, Harbin Institute of Technology, Harbin 150001, China

Sustainability, 2023, vol. 15, issue 2, 1-16

Abstract: The paper presents a set of Direct Strength Method (DSM) formulae for cold-formed stainless steel I-section beams. On basis of a carefully calibrated FE model for stainless steel open-section beams featuring local-global interaction buckling, an extensive database was first established. The existing DSM formula of the best prediction performance was commented on for its drawbacks. For improved strength prediction, a traditional-form DSM formula was proposed first, and novel two-phase DSM formulae were derived on basis of a deep insight into the varying trend of the member strengths. The two-phase DSM formulae were found to be very powerful predictors yielding more accurate strength predictions over the whole range of slenderness and avoiding undue conservatism for intermediate and short members. A considerable boost in design strength by up to 39% can be achieved with the two-phase DSM formula. The DSM curves were developed with a due reliability level to fit into the current design codes.

Keywords: stainless steel; cold-formed I-section; DSM formula; local buckling; global (overall) buckling (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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