Diao, Y; He, SY; Hassanein, MF; Shao, YB; Cashell, KA; Luo, Y; (2025) Behaviour and strength of concrete-filled dual steel stiffened tube-to-SHS T-joints. Journal of Constructional Steel Research , 226 , Article 109258. 10.1016/j.jcsr.2024.109258.

Text JCSRES-D-24-01999-R1 - Clean version.pdf - Accepted Version Access restricted to UCL open access staff until 21 December 2025. Download (2MB)

Abstract

This paper investigates the behaviour of concrete-filled dual steel stiffened tubular (CFDSST) chord-to-square hollow section (SHS) brace T-joints under axial compressive loading. While concrete-filled steel tube (CFST) T-joints have been studied extensively, the performance of CFDSST-to-SHS T-joints remains unexplored. Finite element (FE) models of CFDSST-to-SHS T-joints were developed and validated against available test data. Parametric studies were conducted to examine the effects of key factors, including the brace-to-chord width ratio, inner-to-outer steel tube dimensions, axial force on the chord, and material strengths of steel and concrete. Two failure modes were identified, based on the ratio of flexural stiffness to member length (Κ): local buckling of the brace (Κ < 0.18) and bending deformation of the chord (Κ ≥ 0.18). For joints with Κ > 0.18, a method for calculating the ultimate bending capacity is proposed. This method shows improved accuracy and less standard deviation compared to FE results compared to existing design codes, which tend to provide relatively conservative estimates.

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