Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST Columns
The outer steel tube in a concrete-filled steel tubular (CFST) column confines the core concrete and improves the compressive strength of the core concrete. When there is a notch damage in the tube, the confinement effect may be affected. The confinement effects of the notched steel tube in rectangu...
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| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/15/5161 |
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| author | Biao Li Faxing Ding Yujie Yu Jingke Zhang Qiong Huang Chenjie Gong Haibo Wang |
| author_facet | Biao Li Faxing Ding Yujie Yu Jingke Zhang Qiong Huang Chenjie Gong Haibo Wang |
| author_sort | Biao Li |
| collection | DOAJ |
| description | The outer steel tube in a concrete-filled steel tubular (CFST) column confines the core concrete and improves the compressive strength of the core concrete. When there is a notch damage in the tube, the confinement effect may be affected. The confinement effects of the notched steel tube in rectangular CFST columns were systematically investigated by using numerical approaches. Refined three-dimensional finite element models with advanced concrete constitutive relations were established. With the verified finite element modeling method, full-sized square CFST columns with horizontal, vertical, or diagonal notches at different locations of the steel tube were simulated. Stress distributions and deformation modes of the steel tube and core concrete were analyzed. Columns with a horizontal notch at the plate center location displayed a higher axial strength reduction than those with vertical notches. A parametric study was performed to investigate the influences of concrete strengths, steel strengths, steel ratios, notch length to column width ratios, and notch angles on the compressive strengths of the rectangular CFST columns. A practical design formula was proposed based on the obtained results. The proposed formula could effectively predict the influences of different notches on the confinement effect in the notched CFST columns. |
| first_indexed | 2024-03-09T05:16:33Z |
| format | Article |
| id | doaj.art-f71673e547804a24ac0e695a51e3fa78 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T05:16:33Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-f71673e547804a24ac0e695a51e3fa782023-12-03T12:44:59ZengMDPI AGMaterials1996-19442022-07-011515516110.3390/ma15155161Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST ColumnsBiao Li0Faxing Ding1Yujie Yu2Jingke Zhang3Qiong Huang4Chenjie Gong5Haibo Wang6School of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaShenzhen Expressway Corporation Limited, Shenzhen 518057, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaThe outer steel tube in a concrete-filled steel tubular (CFST) column confines the core concrete and improves the compressive strength of the core concrete. When there is a notch damage in the tube, the confinement effect may be affected. The confinement effects of the notched steel tube in rectangular CFST columns were systematically investigated by using numerical approaches. Refined three-dimensional finite element models with advanced concrete constitutive relations were established. With the verified finite element modeling method, full-sized square CFST columns with horizontal, vertical, or diagonal notches at different locations of the steel tube were simulated. Stress distributions and deformation modes of the steel tube and core concrete were analyzed. Columns with a horizontal notch at the plate center location displayed a higher axial strength reduction than those with vertical notches. A parametric study was performed to investigate the influences of concrete strengths, steel strengths, steel ratios, notch length to column width ratios, and notch angles on the compressive strengths of the rectangular CFST columns. A practical design formula was proposed based on the obtained results. The proposed formula could effectively predict the influences of different notches on the confinement effect in the notched CFST columns.https://www.mdpi.com/1996-1944/15/15/5161concrete-filled steel tubular columnnotchfinite elementcompressive strengthconfinement coefficient |
| spellingShingle | Biao Li Faxing Ding Yujie Yu Jingke Zhang Qiong Huang Chenjie Gong Haibo Wang Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST Columns Materials concrete-filled steel tubular column notch finite element compressive strength confinement coefficient |
| title | Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST Columns |
| title_full | Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST Columns |
| title_fullStr | Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST Columns |
| title_full_unstemmed | Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST Columns |
| title_short | Research on Confinement Effect of the Outer Steel Tube in Notched Square CFST Columns |
| title_sort | research on confinement effect of the outer steel tube in notched square cfst columns |
| topic | concrete-filled steel tubular column notch finite element compressive strength confinement coefficient |
| url | https://www.mdpi.com/1996-1944/15/15/5161 |
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