Vol. 20, No. 3, pp. 300-309 (2024)
BUCKLING MODES OF SCREWED CONNECTIONS IN COLD-FORMED
STEEL BUILT-UP PLATES
Yan-Chun Li 1, Tian-Hua Zhou 2, Ai-Hong Han 1, Yan Lu 3, * and Ji-Hao Chen 1
1 School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
2 School of Civil Engineering, Chang’an University, Xi’an 710061, China
3 School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 20 January 2024; Revised:27 February 2024; Accepted: 10 March 2024
DOI:10.18057/IJASC.2024.20.3.9
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ABSTRACT
Discrete screws can introduce discontinuities at the interface of built-up plates, leading to various buckling modes in cold-formed steel (CFS) built-up plates, namely coordinated buckling and delamination buckling. The impact of these buckling deformation modes on the stability mechanism of CFS screw-connected built-up plates is significant and cannot be overlooked. Consequently, this paper establishes theoretical models for both buckling modes. Analytical solutions for the critical buckling stress (CBS) of the screw-connected built-up plate under these two modes are derived. The validity of the buckling modes and the analytical solutions is confirmed through experimental verification. The results indicate that: (1) delamination buckling is invariably a higher-order mode in comparison to coordinated buckling, and as such, only coordinated buckling is required for calculating the CBS; (2) the CBS calculation method proposed in this paper aligns more closely with the actual mechanical behavior of screw connections in CFS built-up plates.
KEYWORDS
Cold-formed steel, Screwed connection of built-up plates, Shear slip, Coordinated buckling, Delamination buckling, Critical buckling stress
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