Axial Compressive Performance and Constitutive Model of CFST Columns with an Inner FRP Tube

YUE Xianghua; LONG Yueling; JIANG Yujie; LI Wentao; CAI Jian

doi:10.3724/j.gyjzG24041713

Volume 54 Issue 6

Jun. 2024

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YUE Xianghua, LONG Yueling, JIANG Yujie, LI Wentao, CAI Jian. Axial Compressive Performance and Constitutive Model of CFST Columns with an Inner FRP Tube[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(6): 177-189. doi: 10.3724/j.gyjzG24041713

Citation:

YUE Xianghua, LONG Yueling, JIANG Yujie, LI Wentao, CAI Jian. Axial Compressive Performance and Constitutive Model of CFST Columns with an Inner FRP Tube[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(6): 177-189. doi: 10.3724/j.gyjzG24041713

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Axial Compressive Performance and Constitutive Model of CFST Columns with an Inner FRP Tube

doi: 10.3724/j.gyjzG24041713

1. Department of Civil Engineering, Guangdong University of Technology, Guangzhou 510006, China;
2. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China

Received Date: 2024-04-17
Available Online: 2024-06-24

Abstract

Abstract

9 concrete-filled steel tubular columns with an inner FRP tube (CFT-GT), 1 concrete-filled steel tubular column (CFT) and 9 FRP tube confined concrete columns were tested subjected to axial compression. The results showed that the ultimate bearing capacity of CFT-GT was higher than that of CFT. With the decrease of the diameter-to-wall thickness ratios of the inner FRP tube (d/t₂) or the diameter ratios of the steel tube to the FRP tube (D/d), the ultimate bearing capacity increased. The circumferential and longitudinal peak strains of CFT-GT increased with the decrease of d/t₂. With the D/d increasing, the circumferential peak strains of the inner FRP tube of CFT-GT increased. However, D/d had little influence on the longitudinal peak strains of the inner FRP tube. In addition, it showed that all the ultimate circumferential strains of the inner FRP tube of CFT-GT were smaller than that of FRP tube confined concrete columns while the ultimate longitudinal strains of the inner FRP tube of CFT-GT was higher than that of FRP tube confined concrete column specimens. Based on the experimental study above, it was pointed out that the relations between circumferential strain and longitudinal strain in all current FRP confined concrete constitutive models were not appropriate for CFT-GT composite columns. Hence, a new constitutive model was proposed for CFT-GT composite columns.

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References(44)

References

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