Vol. 20, No. 2, pp. 179-187 (2024)
INFLUENCE OF SECTION SLENDERNESS ON THE AXIAL
PERFORMANCE OF HIGH-STRENGTH COLD-FORMED
STEEL BUILT-UP COLUMNS
Shin-Rui Kho 1, Adeline LingYing Ng 1, *, Hieng-Ho Lau 1, Emad Gad 2 and Krishanu Roy 3
1 Faculty of Engineering, Computing and Science, Swinburne University of Technology (Sarawak Campus),
Kuching 93350, Malaysia
2 School of Engineering, Swinburne University of Technology, Hawthorn 3122, Australia
3 School of Engineering Academic, University of Waikato, Hamilton 3216, New Zealand
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 18 June 2024; Revised: 18 June 2024; Accepted: 18 June 2024
DOI:10.18057/IJASC.2024.20.2.10
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ABSTRACT
Cold-formed steel (CFS) sections are widely utilised in roofing and framing systems due to their lightweight properties and ease of fabrication and construction. The application of CFS built-up sections was introduced to enhance the strength and stability of single channels. However, typical CFS channels possess slender profiles with a high section slenderness ratio (w/t)max, making them susceptible to buckling and limiting their effectiveness. Consequently, this study examined the axial compression behaviour and cost-effectiveness of G550 high-strength CFS built-up sections with a reduced (w/t)max compared to conventional industry sizes. Experimental and numerical studies were conducted to assess the effect of member slenderness (KL/r)m and screw arrangement on the CFS built-up sections with different section slenderness. The results demonstrated that the proposed sections, with a lower (w/t)max, significantly improved buckling resistance for members with (KL/r)m less than 90. This improvement is attributed to their more compact profile design, which restrained the occurrence of local buckling. Furthermore, these sections were found to be more cost-effective, offering greater strength at a reduced weight.
KEYWORDS
Axial compression, High-strength cold-formed steel, Slenderness ratios, Screw arrangement, Buckling resistance, Cost-effectiveness
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