Numerical Study on Cold-formed Steel Built-up Stiffened Cruciform Specimen Subjected to Axial Load

Qiliang Miao; Zhensen Song; Zhongxiang ZHANG

doi:10.13206/j.gjgS21103101

Volume 37 Issue 3

May 2022

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Qiliang Miao, Zhensen Song, Zhongxiang ZHANG. Numerical Study on Cold-formed Steel Built-up Stiffened Cruciform Specimen Subjected to Axial Load[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(3): 20-27. doi: 10.13206/j.gjgS21103101

Citation:

Qiliang Miao, Zhensen Song, Zhongxiang ZHANG. Numerical Study on Cold-formed Steel Built-up Stiffened Cruciform Specimen Subjected to Axial Load[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(3): 20-27. doi: 10.13206/j.gjgS21103101

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Numerical Study on Cold-formed Steel Built-up Stiffened Cruciform Specimen Subjected to Axial Load

doi: 10.13206/j.gjgS21103101

1. School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Shanghai Key Laboratory of Digital Operation and Maintenance of Public Buildings and Infrastructure, Shanghai 200240, China;
3. East China Architectural Design & Research Institute, Shanghai 200001, China

Received Date: 2021-10-31
Available Online: 2022-05-27

Abstract

Abstract

Either flexural and torsional buckling may occur when a cold-formed steel built-up stiffened cruciform column subjected to axial compression. A numerical investigation was performed to study the failure modes and ultimate resistances of cold-formed steel thin-walled columns made from built-up stiffened cruciform sections. In the finite element simulations, built-up columns with three different cross-sectional sizes were designed and specimens with various slenderness ratios and bolt spacing were investigated. The range of the slenderness ratios of the specimens was from 20 to 140 at an interval of 20. Three bolt spacings of 150, 300, 450 mm were employed to study the built-up effect on compressive resistance of the specimens.
The results show that the failure modes of such columns were dominated by their slenderness ratios. Overall torsional buckling occurred for specimens with λ_x<λ_ω, while overall flexural buckling took place for specimens outside this range. The ultimate resistances were affected by the slenderness ratio, and the ultimate resistance of columns with the same cross-section size decreased as the slenderness ratio increased. The stiffness and ultimate bearing capacity of the column decreased when the bolt spacing increased, but such an effect was found insignificant within common bolt spacing ranges and the failure modes were not affected by the bolt spacing. The axial bearing performance of the built-up section columns was found to be inferior to their integral section column counterparts with same cross-sectional sizes, and this was more obvious for the columns failed by torsional buckling.
- build-up,
- cold-formed steel thin-walled section,
- cruciform section with flanges,
- numerical analysis,
- compressive behavior,
- failure mode

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References(14)

References

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