Steel and Composite Structures

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Behavior of circular concrete-filled steel tubular columns under pure torsion

  • Ding, Fa-xing (School of Civil Engineering, Central South University) ;
  • Fu, Qiang (School of Civil Engineering, Central South University) ;
  • Wen, Bing (School of Civil Engineering, Central South University) ;
  • Zhou, Qi-shi (School of Civil Engineering, Central South University) ;
  • Liu, Xue-mei (School of Civil Engineering and Built Environment, Queensland University of Technology)
  • Received : 2016.06.21
  • Accepted : 2017.12.15
  • Published : 2018.02.25
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Abstract

Concrete-filled steel tubular (CFT) columns are commonly used in engineering structures and always subjected to torsion in practice. This paper is thus devoted to investigate the mechanical behavior of circular CFT columns under pure torsion.3D finite element models based on reasonable material constitutive relation were established for analyzing the load-strain ($T-{\gamma}$) curves of circular CFT columns under pure torsion. The numerical simulation indicated that local bulking of the steel tube in CFT columns was prevented and the shear strength and ductility of the core concrete were significantly improved due to the confinement effect between the steel tube and the core concrete. Based on the results, formulas to predict the torsional ultimate bearing capacity of circular CFT columns were proposed with satisfactory correspondence with experimental results. Besides, formulas of composite shear stiffness and the overall process of the $T-{\gamma}$ relation of circular CFT columns under pure torsion were proposed.

Keywords

References

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  2. Torsional behaviour of concrete-filled circular steel tubular members under coupled compression and torsion vol.34, pp.None, 2018, https://doi.org/10.1016/j.istruc.2021.08.026
  3. Confinement Effect and Efficiency of Concentrically Loaded RACFCST Stub Columns vol.15, pp.1, 2018, https://doi.org/10.3390/ma15010154