Advanced Steel Construction

Vol. 16, No. 2, pp. 156-169 (2020)




Helmy Tjahjanto 1, 2, *, Gregory MacRae 2 and Anthony Abu 2

1 Department of Civil Engineering, Parahyangan Catholic University, Jl. Ciumbuleuit 94 Bandung 40141, Indonesia

2 Department of Civil and Natural Resources Engineering, University of Canterbury, Private Bag 4800 Christchurch 8140, New Zealand

*(Corresponding author. Ph. +62-22-2033-692, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Received: 29 May 2019; Revised: 15 April 2020; Accepted: 18 April 2020




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The behaviour of square concrete-filled steel tubular (CFST) column subassemblies with direct-welded connections has been experimentally investigated. The connection strength and stiffness have been improved by utilizing through-rods and washer plates to the column. Bidirectional loading tests have been conducted and indicate that the direct-welded connections with through-rods and washer plates result in better performance compared to the unstiffened connection. Out-of-plane shear fracture in the column tube plates due to the high stress concentration at the beam flange tips is critical and may limit the capacity of the connections. Numerical analyses have been conducted to obtain the relationship between the considered design parameters and the stress concentration in the tube plates, which has subsequently been formulated for design. The elastic rotational stiffness of the CFST joints for moment frame analyses has also been developed.




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