Plastic hinge behavior of rectangular CFRP-confined RC columns: meso-scale modelling and formulation
The ultimate rotation capacity, depending on the plastic hinge length, is a vital factor in the seismic design of flexural members. This paper focuses on the investigation of the plastic hinge length and size effect of rectangular carbon fiber-reinforced polymer (CFRP)-confined reinforced concrete (...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/180216 |
| _version_ | 1811683788726468608 |
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| author | Fan, Lingling Jin, Liu Zhao, Ou Liang, Jian Li, Ping Du, Xiuli |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Fan, Lingling Jin, Liu Zhao, Ou Liang, Jian Li, Ping Du, Xiuli |
| author_sort | Fan, Lingling |
| collection | NTU |
| description | The ultimate rotation capacity, depending on the plastic hinge length, is a vital factor in the seismic design of flexural members. This paper focuses on the investigation of the plastic hinge length and size effect of rectangular carbon fiber-reinforced polymer (CFRP)-confined reinforced concrete (RC) columns. Firstly, considerable scatter and evident bias of the calculation results were found after evaluating existing models for calculating the plastic hinge length of FRP-confined RC columns. Accordingly, a meso-scale numerical approach was developed, with concrete heterogeneity considered, to investigate the influences of the confinement ratio and corner radius on the plastic hinge length and size effect of rectangular CFRP-confined RC columns. Results show that columns having different cross-sectional sizes exhibit similar failure patterns, and the region of lateral crack propagation for columns with lower confinement ratios is larger than that for columns with higher confinement ratios. The actual plastic hinge length is determined based on the yielding zone of reinforcement, the crushing zone of concrete, and the localization zone of curvature, while the localization zone of curvature is employed to determine the real plastic hinge zone. The size effect is found to exist in the plastic hinge length ratio, and it is weakened with the increase of the corner radius, which can be attributed to the fact that columns with higher corner ratios have more effective confinement. Taking into account the size effect, a new model for calculating the ultimate drift ratio of CFRP-confined RC columns was proposed based on an assumption of curvature distribution and presented accurate predictions. |
| first_indexed | 2024-10-01T04:18:18Z |
| format | Journal Article |
| id | ntu-10356/180216 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:18:18Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1802162024-09-24T04:50:48Z Plastic hinge behavior of rectangular CFRP-confined RC columns: meso-scale modelling and formulation Fan, Lingling Jin, Liu Zhao, Ou Liang, Jian Li, Ping Du, Xiuli School of Civil and Environmental Engineering Engineering Fiber-reinforced polymer Rectangular column The ultimate rotation capacity, depending on the plastic hinge length, is a vital factor in the seismic design of flexural members. This paper focuses on the investigation of the plastic hinge length and size effect of rectangular carbon fiber-reinforced polymer (CFRP)-confined reinforced concrete (RC) columns. Firstly, considerable scatter and evident bias of the calculation results were found after evaluating existing models for calculating the plastic hinge length of FRP-confined RC columns. Accordingly, a meso-scale numerical approach was developed, with concrete heterogeneity considered, to investigate the influences of the confinement ratio and corner radius on the plastic hinge length and size effect of rectangular CFRP-confined RC columns. Results show that columns having different cross-sectional sizes exhibit similar failure patterns, and the region of lateral crack propagation for columns with lower confinement ratios is larger than that for columns with higher confinement ratios. The actual plastic hinge length is determined based on the yielding zone of reinforcement, the crushing zone of concrete, and the localization zone of curvature, while the localization zone of curvature is employed to determine the real plastic hinge zone. The size effect is found to exist in the plastic hinge length ratio, and it is weakened with the increase of the corner radius, which can be attributed to the fact that columns with higher corner ratios have more effective confinement. Taking into account the size effect, a new model for calculating the ultimate drift ratio of CFRP-confined RC columns was proposed based on an assumption of curvature distribution and presented accurate predictions. This research work was supported by the National Natural Science Foundation of China (No.51978022, No. 51708007). The support is greatly appreciated. 2024-09-24T04:50:48Z 2024-09-24T04:50:48Z 2024 Journal Article Fan, L., Jin, L., Zhao, O., Liang, J., Li, P. & Du, X. (2024). Plastic hinge behavior of rectangular CFRP-confined RC columns: meso-scale modelling and formulation. Engineering Structures, 307, 117923-. https://dx.doi.org/10.1016/j.engstruct.2024.117923 0141-0296 https://hdl.handle.net/10356/180216 10.1016/j.engstruct.2024.117923 2-s2.0-85189459844 307 117923 en Engineering Structures © 2024 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering Fiber-reinforced polymer Rectangular column Fan, Lingling Jin, Liu Zhao, Ou Liang, Jian Li, Ping Du, Xiuli Plastic hinge behavior of rectangular CFRP-confined RC columns: meso-scale modelling and formulation |
| title | Plastic hinge behavior of rectangular CFRP-confined RC columns: meso-scale modelling and formulation |
| title_full | Plastic hinge behavior of rectangular CFRP-confined RC columns: meso-scale modelling and formulation |
| title_fullStr | Plastic hinge behavior of rectangular CFRP-confined RC columns: meso-scale modelling and formulation |
| title_full_unstemmed | Plastic hinge behavior of rectangular CFRP-confined RC columns: meso-scale modelling and formulation |
| title_short | Plastic hinge behavior of rectangular CFRP-confined RC columns: meso-scale modelling and formulation |
| title_sort | plastic hinge behavior of rectangular cfrp confined rc columns meso scale modelling and formulation |
| topic | Engineering Fiber-reinforced polymer Rectangular column |
| url | https://hdl.handle.net/10356/180216 |
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