Experimental and Numerical Investigation of Axial Compression Behaviour of FRP-Confined Concrete-Core-Encased Rebar
The axial compression behaviour of fibre-reinforced polymer (FRP)-confined concrete-core-encased rebar (FCCC-R) was investigated by performing monotonic axial compression tests on seven groups of FCCC-R specimens and three groups of pure rebar specimens. The research parameters considered were the F...
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| Format: | Article |
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MDPI AG
2023-02-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/15/4/828 |
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| author | Jingzhou Lu Han Huang Yunkai Li Tong Mou |
| author_facet | Jingzhou Lu Han Huang Yunkai Li Tong Mou |
| author_sort | Jingzhou Lu |
| collection | DOAJ |
| description | The axial compression behaviour of fibre-reinforced polymer (FRP)-confined concrete-core-encased rebar (FCCC-R) was investigated by performing monotonic axial compression tests on seven groups of FCCC-R specimens and three groups of pure rebar specimens. The research parameters considered were the FRP winding angle (0°, ±45°, and 90°), number of layers (2, 4, and 6 layers), and slenderness ratio of specimens (15.45, 20, and 22.73). The test results showed that FCCC-R’s axial compression behaviour improved significantly compared with pure rebar. The axial load–displacement curves of the FCCC-R specimens had a second ascending branch, and their carrying capacity and ductility were enhanced substantially. The best buckling behaviour was observed for the FRP winding angle of 90°. The capacity and ductility of the specimens were positively related to the number of FRP-wrapped layers and inversely related to the slenderness ratio of the specimens. A finite element model of FCCC-R was constructed and agreed well with the test results. The finite element model was used for parametric analysis to reveal the effect of the area ratio, FRP confinement length, internal bar eccentricity, and mortar strength on the axial compression behaviour of FCCC-R. The numerical results showed that the area ratio had the most significant impact on the axial compression behaviour of FCCC-R. The confinement length of the FRP pipe and internal bar eccentricity had similar effects on the axial compression behaviour of FCCC-R. Both of them had a significant impact on the second ascending branch, with the post-peak behaviour exhibiting minimal differences. The influence of mortar strength on the axial compression behaviour of FCCC-R was observed to be minimal. |
| first_indexed | 2024-03-11T08:15:14Z |
| format | Article |
| id | doaj.art-d47dad0418d84903a61fd94dae050ec0 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-11T08:15:14Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-d47dad0418d84903a61fd94dae050ec02023-11-16T22:50:30ZengMDPI AGPolymers2073-43602023-02-0115482810.3390/polym15040828Experimental and Numerical Investigation of Axial Compression Behaviour of FRP-Confined Concrete-Core-Encased RebarJingzhou Lu0Han Huang1Yunkai Li2Tong Mou3School of Civil Engineering, Yantai University, Yantai 264005, ChinaSchool of Civil Engineering, Yantai University, Yantai 264005, ChinaSchool of Civil Engineering, Yantai University, Yantai 264005, ChinaSchool of Civil Engineering, Yantai University, Yantai 264005, ChinaThe axial compression behaviour of fibre-reinforced polymer (FRP)-confined concrete-core-encased rebar (FCCC-R) was investigated by performing monotonic axial compression tests on seven groups of FCCC-R specimens and three groups of pure rebar specimens. The research parameters considered were the FRP winding angle (0°, ±45°, and 90°), number of layers (2, 4, and 6 layers), and slenderness ratio of specimens (15.45, 20, and 22.73). The test results showed that FCCC-R’s axial compression behaviour improved significantly compared with pure rebar. The axial load–displacement curves of the FCCC-R specimens had a second ascending branch, and their carrying capacity and ductility were enhanced substantially. The best buckling behaviour was observed for the FRP winding angle of 90°. The capacity and ductility of the specimens were positively related to the number of FRP-wrapped layers and inversely related to the slenderness ratio of the specimens. A finite element model of FCCC-R was constructed and agreed well with the test results. The finite element model was used for parametric analysis to reveal the effect of the area ratio, FRP confinement length, internal bar eccentricity, and mortar strength on the axial compression behaviour of FCCC-R. The numerical results showed that the area ratio had the most significant impact on the axial compression behaviour of FCCC-R. The confinement length of the FRP pipe and internal bar eccentricity had similar effects on the axial compression behaviour of FCCC-R. Both of them had a significant impact on the second ascending branch, with the post-peak behaviour exhibiting minimal differences. The influence of mortar strength on the axial compression behaviour of FCCC-R was observed to be minimal.https://www.mdpi.com/2073-4360/15/4/828FRP-confined concrete-core-encased rebarbucklingmonotonic loadingaxial compressive behaviourfinite element analysis |
| spellingShingle | Jingzhou Lu Han Huang Yunkai Li Tong Mou Experimental and Numerical Investigation of Axial Compression Behaviour of FRP-Confined Concrete-Core-Encased Rebar Polymers FRP-confined concrete-core-encased rebar buckling monotonic loading axial compressive behaviour finite element analysis |
| title | Experimental and Numerical Investigation of Axial Compression Behaviour of FRP-Confined Concrete-Core-Encased Rebar |
| title_full | Experimental and Numerical Investigation of Axial Compression Behaviour of FRP-Confined Concrete-Core-Encased Rebar |
| title_fullStr | Experimental and Numerical Investigation of Axial Compression Behaviour of FRP-Confined Concrete-Core-Encased Rebar |
| title_full_unstemmed | Experimental and Numerical Investigation of Axial Compression Behaviour of FRP-Confined Concrete-Core-Encased Rebar |
| title_short | Experimental and Numerical Investigation of Axial Compression Behaviour of FRP-Confined Concrete-Core-Encased Rebar |
| title_sort | experimental and numerical investigation of axial compression behaviour of frp confined concrete core encased rebar |
| topic | FRP-confined concrete-core-encased rebar buckling monotonic loading axial compressive behaviour finite element analysis |
| url | https://www.mdpi.com/2073-4360/15/4/828 |
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