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Compression tests of octagonal concrete-filled thin-walled tube columns
Highlights The behavior of octagonal CFT columns under compression is investigated. Local buckling of thin-walled tubes depends on b/t ratio and section shape. The compression behavior is estimated by strain-compatibility analysis. Effective stress-strain relationships of thin tube and concrete are suggested. Applicability of AISC 360 strengths to octagonal CFT columns is investigated.
Abstract The compression behavior of octagonal concrete-filled thin-walled tube (OCFT) columns was investigated. Eight OCFT columns with different tube sections were tested under monotonic compressive loading. The tests showed that the thin-walled tubes underwent elastic or inelastic local buckling, and the slenderness ratio (or width-to-thickness ratio) and section shape of the tubes significantly affected their buckling modes. Despite such local buckling, the load-deformation behavior of the OCFT columns all was highly ductile, due to confinement to the infilled concrete. The design strengths of AISC 360-16 agreed well with the test strengths. In this study, effective stress–strain relationships of the tube and infilled concrete were proposed to account for the local buckling and confinement. The maximum strength and post-buckling behavior were estimated through the strain-compatibility analysis, and the results were compared with the tests.
Compression tests of octagonal concrete-filled thin-walled tube columns
Highlights The behavior of octagonal CFT columns under compression is investigated. Local buckling of thin-walled tubes depends on b/t ratio and section shape. The compression behavior is estimated by strain-compatibility analysis. Effective stress-strain relationships of thin tube and concrete are suggested. Applicability of AISC 360 strengths to octagonal CFT columns is investigated.
Abstract The compression behavior of octagonal concrete-filled thin-walled tube (OCFT) columns was investigated. Eight OCFT columns with different tube sections were tested under monotonic compressive loading. The tests showed that the thin-walled tubes underwent elastic or inelastic local buckling, and the slenderness ratio (or width-to-thickness ratio) and section shape of the tubes significantly affected their buckling modes. Despite such local buckling, the load-deformation behavior of the OCFT columns all was highly ductile, due to confinement to the infilled concrete. The design strengths of AISC 360-16 agreed well with the test strengths. In this study, effective stress–strain relationships of the tube and infilled concrete were proposed to account for the local buckling and confinement. The maximum strength and post-buckling behavior were estimated through the strain-compatibility analysis, and the results were compared with the tests.
Compression tests of octagonal concrete-filled thin-walled tube columns
Lim, Jong-Jin (author) / Eom, Tae-Sung (author)
Engineering Structures ; 221
2020-07-04
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2018