Tests and calculations for hollow structural steel (HSS) stub columns filled with self-consolidating concrete (SCC)

• Published in: Journal of constructional steel research Vol. 61; no. 9; pp. 1241 - 1269
• Main Authors: Han, Lin-Hai, Yao, Guo-Huang, Zhao, Xiao-Ling
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2005
• Subjects: Composite action; Composite columns; Concrete; Confinement factor; Design; Hollow sections; Sectional capacity; Design; Sectional capacity; Concrete; Composite action; Confinement factor; Hollow sections; Composite columns
• ISSN: 0143-974X; 1873-5983
• DOI: 10.1016/j.jcsr.2005.01.004

The behaviour of self-consolidating concrete (SCC) filled hollow structural steel (HSS) stub columns subjected to an axial load was investigated experimentally. A total of 50 specimens were tested. The main parameters varied in the tests are: (1) sectional types: circular and square; (2) steel yielding strength: from 282 to 404 MPa; and (3) tube diameter or width to wall thickness ratio ( D / t or B / t ): from 30 to 134. A mechanics model is developed in this paper for concrete-filled HSS stub columns. A unified theory is described whereby a confinement factor ( ξ ) is introduced to describe the composite action of the steel tube and the filled concrete. The predicted load versus deformation relationship was in good agreement with test results. The theoretical model was used to investigate the influence of important parameters that determine the ultimate strength of the composite columns. The parametric and experimental studies provide information for the development of formulae for the calculation of the ultimate strength and the axial load versus axial strain curves of the composite columns. Comparisons are made with predicted stub column strengths using the existing codes, such as ACI-1999, AISC-LRFD-1999, AIJ-1997, BS5400-1979 and EC4-1994.