Experimental research on square steel tubular columns filled with steel-reinforced self-consolidating high-strength concrete under axial load

• Published in: Engineering structures Vol. 32; no. 8; pp. 2278 - 2286
• Main Authors: Zhu, Meichun, Liu, Jianxin, Wang, Qingxiang, Feng, Xiufeng
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.08.2010; Elsevier
• Subjects: Applied sciences; Building structure; Buildings. Public works; Composite columns; Construction (buildings and works); Ductility; Exact sciences and technology; High-strength concrete; Self-consolidating concrete; Steel section; Steel tube; Steel-concrete composite structure; Ultimate strength; Steel section; Ductility; High-strength concrete; Self-consolidating concrete; Steel tube; Ultimate strength; Composite columns; Ultimate strength method; Concrete-filled steel; Tubular construction; Stress strain relation; Steel; Experimental study; Self compacting concrete; Experimental result; Research program; Composite construction; Column; Properties of materials; Axial load; Computing method; Square section; High strength concrete
• ISSN: 0141-0296; 1873-7323
• DOI: 10.1016/j.engstruct.2010.04.002

A new design model for steel–concrete composite columns, namely square steel tubular columns filled with steel-reinforced self-consolidating high-strength concrete, is proposed. In this type of steel–concrete composite column, a steel section is inserted into the square steel tube and self-consolidating high-strength concrete is filled into the tube. Eighteen composite column specimens were tested under axial compression. The effects of concrete strength, width-to-thickness ratio, length-to-width ratio, and ratio of steel section on the strength and deformation characteristics of these composite columns are discussed. The experimental results indicate that the encased steel section can restrain the generation of diagonal shear cracks in the core concrete thus changing the failure mode and the post-yield behavior of short composite columns. Formulas for calculating the ultimate strength of centrally loaded composite columns are proposed. The calculated values are in good agreement with the test results.