Steel and Composite Structures

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Axial compression behavior of double-skinned composite tubular columns under pure compression on concrete cores

  • Lee, Jeonghwa (Futhre and Fusion Lab of Architectural Civil and Environmental Engineering, Korea University) ;
  • Byun, Namju (Futhre and Fusion Lab of Architectural Civil and Environmental Engineering, Korea University) ;
  • Kang, Young Jong (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Won, Deok Hee (Department of Civil Engineering, Halla University) ;
  • Kim, Seungjun (School of Civil, Environmental and Architectural Engineering, Korea University)
  • Received : 2021.12.30
  • Accepted : 2022.04.18
  • Published : 2022.05.25
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Abstract

A double-skinned composite tubular (DSCT) column, which is an internally confined concrete-filled tubular column with a hollow section, has been developed for efficient use of materials that reduce self-weight and enhance seismic performance. It exhibits excellent material behavior with ductility owing to the confinement induced by outer and inner steel tubes. This study conducted axial compression tests considering the effects of steel tube thickness and hollow diameter ratios of DSCT columns on the material behavior of confined concrete under pure axial compression on concrete cores. From the axial compression tests, various combinations of outer and inner tube thicknesses and two different hollow section ratios were considered. Additionally, confined concrete material behavior, axial strength, failure modes, and ductility of DSCT columns were evaluated. Based on this study, it was concluded that the tests show a good correlation with peak strength and shapes of nonlinear stress-strain curves presented in literature; however, the thinner outer and inner steel tubes may reduce the ductility of DSCT columns when using thinner outer and inner tubes and higher confined stress levels. Finally, the minimum thickness requirements of the steel tubes for DSCT columns were discussed in terms of strength and ductility of test specimens.

Keywords

Acknowledgement

This research was supported by a grant (PA110020) from the Patented Formula Commercialization Program funded by the Seoul Business Agency. It was also funded by the Korea National Research Foundation (grant number NRF-2018R1D1A1B07050335 and NRF-2021R1A5A1032433)

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