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Steel and Composite Structures Volume 43, Number 4, May25 2022 (Special Issue) pages 431-445 DOI: https://doi.org/10.12989/scs.2022.43.4.431 |
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Axial compression behavior of double-skinned composite tubular columns under pure compression on concrete cores |
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Jeonghwa Lee, Namju Byun, Young Jong Kang, Deok Hee Won and Seungjun Kim
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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. | ||
| Key Words | ||
| DSCT column; confined concrete; axial compression tests; stress-strain relationship; ductility | ||
| Address | ||
| Jeonghwa Lee:Futhre and Fusion Lab of Architectural Civil and Environmental Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea Namju Byun:Futhre and Fusion Lab of Architectural Civil and Environmental Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea Young Jong Kang:School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea Deok Hee Won:Department of Civil Engineering, Halla University, 28 Halla University-gil, Wonju-si, Gangwon-do, 26404, Republic of Korea Seungjun Kim:School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea | ||