City Research Online

Abstract

The research presented in this paper is aimed to assess both flexural and axial compressive behaviour of circular steel slag concrete-filled steel tube (SSC-FST) members subjected to short-term static loading. The tests of circular SSC-FST beams and columns were first performed with different replacement ratio of steel slag aggregate (SSA) and slenderness ratio, followed by finite element (FE) modelling to replicate the behaviour of circular SSC-FST beams as well as columns with various slenderness ratio. The results indicate that, both beam and column specimens show good deformability and load-carrying capability, and three phases are observed in the measured moment (load) vs. deformation diagrams. At the end of tests, several symmetrically distributed mild local bulges of steel tube and tiny tensile cracks together with inconspicuous compressive crushing of concrete core were observed for the beam specimens, while one major and a few minor tube local bulges and severe compressive crushing of concrete core for the column specimens were observed. In general, the SSC-FST specimens possess a superior capacity and ductility as well as a lower flexural stiffness than the reference CFST specimens, and the axial compressive capacity and ductility of SSC-FST column specimens show a decreasing trend when increases. In the end, simplified formulae to compute the flexural capacity and axial compressive capacity of circular SSC-FST members were proposed.

Publication Type:	Article
Additional Information:	© 2025. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords:	Circular steel slag concrete-filled steel tube (SSC-FST), Beams, Columns, Finite element (FE) modelling, Capacity, Simplified formulae
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
Departments:	School of Science & Technology School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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