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2022 Vol.13, Issue 1 Preview Page

General Article

Modeling of octagonal concrete-filled double-skin steel tube stub columns under axial compression
Shagea Alqawzai1*
,
Bo Yang2
,
Belal Alsubari3
,
Hayder Saadoon Abdulaali4
,
Mohamed Elchalakani5
1Ph.D Candidate, School of Civil Engineering, Chongqing University, Chongqing 400045, China
2Professor, School of Civil Engineering, Chongqing University, Chongqing 400045, China
3Assistance Professor, Department of Civil Engineering, Faculty of Engineering, Miami College of Henan University, Kaifeng, Henan, China
4Ph.D Candidate, Department of Architecture, Faculty of Engineering and Built Environment, University of Kebangsaan Malaysia, Bangi, Selangor, Malaysia
5Professor, School of Civil, Environmental and Mining Engineering, The University of Western Australia, Crewley, WA 6009, Australia
*Corresponding Author
31 March 2022. pp. 23-43
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Abstract

Octagonal concrete-filled double-skin steel tube (OCFDST) columns have drawn the attention of academia and building industries since they combined the advances of higher confinement of circular CFDST columns and the better constructability options of square CFDST columns. Therefore, this paper investigates numerically the behavior of axially compressed OCFDST stub columns by the means of finite element analysis employing ABAQUS software. The accuracy of the developed finite element (FE) models was validated against the experimental results in terms of axial load-axial shortening curves and the ultimate strength of the test specimens. Then, subsequent parametric studies considering a wide range of outer parameters were performed by the verified FE model on the effects of various parameters including the thickness of outer steel tube (to), the thickness of inner steel tube (ti), the diameter of inner steel tube (Di) and type and arrangement of stiffening schemes. The numerically generated data were then used to evaluate the applicability of the design guidelines provided by existing European, North American, and Chinese provisions for composite columns. Based on the results, it was found that EC4 and modified EC4 formulas can safely be adopted to predict the design ultimate strength of OCFDST stub columns. AISC360 can also give a reasonable for non-stiffened specimens while, DBJ provides un-conservative predictions of ultimate strength when applied to non-stiffened OCFDST stub columns, while it can accurately calculate the ultimate strength of the OCFDST axial members with different stiffening schemes.

Keywords
octagonal concrete-filled double-skin tube
stub column
finite element modeling
stiffening schemes
ultimate capacity;
ductility
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Information
  • Publisher :Sustainable Building Research Center (ERC) Innovative Durable Building and Infrastructure Research Center
  • Publisher(Ko) :건설구조물 내구성혁신 연구센터
  • Journal Title :International Journal of Sustainable Building Technology and Urban Development
  • Volume : 13
  • No :1
  • Pages :23-43
  • Received Date : 2022-01-26
  • Accepted Date : 2022-03-15
  • DOI :https://doi.org/10.22712/susb.20220004
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