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Steel and Composite Structures
  Volume 25, Number 3, October30 2017 , pages 375-388

Mechanical behavior of elliptical concrete-filled steel tubular stub columns under axial loading
Fa-xing Ding, Xing-zhi Ding, Xue-mei Liu, Hai-bo Wang, Zhi-wu Yu and Chang-jing Fang

    This paper presents a combined experimental, numerical, and analytical study on elliptical concrete-filled steel tubular (E-CFT) and rebar-stiffened elliptical concrete-filled steel tubular (RE-CFT) subjected to axial loading. ABAQUS was used to establish 3D finite element (FE) models for the composite columns and the FE results agreed well with the experimental results. It was found that the ultimate load-bearing capacity of RE-CFT stub columns was 20% higher than that of the E-CFT stub columns. Such improvement was attributed to the reinforcement effects from the internal rebar-stiffeners, which effectively enhanced the confinement effect on the core concrete, thereby significantly improved both the ultimate bearing capacity and the ductility of the E-CFT columns. Based on the results, equations were also established in this paper to predict the bearing capacities of E-CFT and RE-CFT stub columns under axial loading. The predicted results agreed well with both experimental and numerical results, and had much higher accuracy than other available methods.
Key Words
    rebar-stiffened; elliptical concrete-filled steel tubular (E-CFT); finite element analysis (FEA); Ultimate bearing capacity
Fa-xing Ding, Xing-zhi Ding, Hai-bo Wang and Chang-jing Fang: School of Civil Engineering, Central South University, Changsha, Hunan Province, 410075, P. R. China
Xue-mei Liu: Schoo of Civil Engineering and Built Environment, Queensland University of Technology,
Brisbane, QLD 4001, Australia
Xue-mei Liu: School of Civil Engineering, Central South University, Changsha, Hunan Province, 410075, P. R. China;
National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China

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