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.
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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.
| Type: | Article |
|---|---|
| Title: | Behaviour and strength of concrete-filled dual steel stiffened tube-to-SHS T-joints |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jcsr.2024.109258 |
| Publisher version: | https://doi.org/10.1016/j.jcsr.2024.109258 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Tubular joints, T-joints, Concrete-filled steel tube, Stiffeners, Brace, Chord, Numerical analysis, Design capacity |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10203256 |
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