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Design of direct-formed square and rectangular hollow section stub columns
Abstract Provisions in the current steel design standards do not differentiate square and rectangular hollow sections (SHS and RHS) members cold-formed by different approaches. Research on the effect of post-cold-forming hot-dip galvanizing on residual stress and stub column behaviour is also insufficient. Complementary experimental studies showed that: (1) the stub column behaviour of a direct-formed SHS/RHS (regular-strength or high-strength) is superior to its indirect-formed counterpart; (2) the current codified slenderness limits and the effective width method tend to misjudge a nonslender direct-formed section as a slender section, resulting in an unnecessary penalty and member strength underestimation; and (3) post-cold-forming galvanizing can effectively relieve residual stress and improve the stub column behaviour of a direct-formed SHS/RHS. This research presents a finite element (FE) study with models developed using previously measured residual stresses, strength properties and geometric imperfections in direct-formed SHS/RHS. The modelling approach was validated against previous experimental data from 24 stub column tests. The stub column behaviour of direct-formed regular- and high-strength SHS/RHS (untreated and galvanized) was studied via an FE parametric study, including 624 models to cover a wide range of cross-sectional dimensions and material properties. The relevant provisions in the current design standards were examined. The experimental and FE data justifies the use of higher design curves for direct-formed SHS/RHS (untreated and galvanized). Modifications to the existing design rules for SHS/RHS stub columns against cross-sectional yielding or local buckling were proposed.
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Highlights Stub column behaviour of direct-formed square and rectangular hollow sections are studied. The effects of steel strength and post-production hot-dip galvanizing are studied. 624 FE models are analyzed. The AISC 360, CSA S16 and AISI S100 design approaches are found to be inaccurate. New approaches based on AISC 360 and AISI S100 for stub column design are proposed.
Design of direct-formed square and rectangular hollow section stub columns
Abstract Provisions in the current steel design standards do not differentiate square and rectangular hollow sections (SHS and RHS) members cold-formed by different approaches. Research on the effect of post-cold-forming hot-dip galvanizing on residual stress and stub column behaviour is also insufficient. Complementary experimental studies showed that: (1) the stub column behaviour of a direct-formed SHS/RHS (regular-strength or high-strength) is superior to its indirect-formed counterpart; (2) the current codified slenderness limits and the effective width method tend to misjudge a nonslender direct-formed section as a slender section, resulting in an unnecessary penalty and member strength underestimation; and (3) post-cold-forming galvanizing can effectively relieve residual stress and improve the stub column behaviour of a direct-formed SHS/RHS. This research presents a finite element (FE) study with models developed using previously measured residual stresses, strength properties and geometric imperfections in direct-formed SHS/RHS. The modelling approach was validated against previous experimental data from 24 stub column tests. The stub column behaviour of direct-formed regular- and high-strength SHS/RHS (untreated and galvanized) was studied via an FE parametric study, including 624 models to cover a wide range of cross-sectional dimensions and material properties. The relevant provisions in the current design standards were examined. The experimental and FE data justifies the use of higher design curves for direct-formed SHS/RHS (untreated and galvanized). Modifications to the existing design rules for SHS/RHS stub columns against cross-sectional yielding or local buckling were proposed.
Graphical abstract Display Omitted
Highlights Stub column behaviour of direct-formed square and rectangular hollow sections are studied. The effects of steel strength and post-production hot-dip galvanizing are studied. 624 FE models are analyzed. The AISC 360, CSA S16 and AISI S100 design approaches are found to be inaccurate. New approaches based on AISC 360 and AISI S100 for stub column design are proposed.
Design of direct-formed square and rectangular hollow section stub columns
Tayyebi, Kamran (author) / Sun, Min (author)
2020-12-21
Article (Journal)
Electronic Resource
English
Design of direct-formed square and rectangular hollow section beams
| Elsevier | 2021