On the performance of circular concrete-filled high strength steel columns under axial loading
This work presents a numerical study to investigate the performance of circular high-strength steel tubes filled with concrete (CFT) under monotonic axial loading. A model is developed to implement the material constitutive relationships and non-linearity. Calibration against previous experimental d...
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| Format: | Article |
| Language: | English |
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Elsevier
2012-06-01
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| Series: | Alexandria Engineering Journal |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110016812000439 |
| _version_ | 1818646829723549696 |
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| author | Mohamed Mahmoud El-Heweity |
| author_facet | Mohamed Mahmoud El-Heweity |
| author_sort | Mohamed Mahmoud El-Heweity |
| collection | DOAJ |
| description | This work presents a numerical study to investigate the performance of circular high-strength steel tubes filled with concrete (CFT) under monotonic axial loading. A model is developed to implement the material constitutive relationships and non-linearity. Calibration against previous experimental data shows good agreement. A parametric study is then conducted using the model and compared with codes provisions. Strength and ductility of confined concrete are of primary concern. Variables considered are yield stress of steel tube and column diameter. The assessment of column performance is based on axial load carrying capacities and enhancements of both strength and ductility due to confinement. Two parameters namely strength enhancement factor (Kf) and ductility index (μ) are clearly defined and introduced for assessment. Results indicate that both concrete strength and ductility of CFT columns are enhanced but to different extents. The ductile behaviors are significantly evident. The increase in yield stress of steel tube has a minimal effect on concrete strength but pronounced effect on concrete ductility. However, reduction in ductility is associated with using high-tensile steel of Grade 70. The overall findings indicate that the use of high-strength tube in CFT columns is not promising. This finding may seriously be considered in seismic design. |
| first_indexed | 2024-12-17T00:52:52Z |
| format | Article |
| id | doaj.art-19257b48d8be4f2ca9c75b706d63d0ea |
| institution | Directory Open Access Journal |
| issn | 1110-0168 |
| language | English |
| last_indexed | 2024-12-17T00:52:52Z |
| publishDate | 2012-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Alexandria Engineering Journal |
| spelling | doaj.art-19257b48d8be4f2ca9c75b706d63d0ea2022-12-21T22:09:42ZengElsevierAlexandria Engineering Journal1110-01682012-06-0151210911910.1016/j.aej.2012.05.006On the performance of circular concrete-filled high strength steel columns under axial loadingMohamed Mahmoud El-HeweityThis work presents a numerical study to investigate the performance of circular high-strength steel tubes filled with concrete (CFT) under monotonic axial loading. A model is developed to implement the material constitutive relationships and non-linearity. Calibration against previous experimental data shows good agreement. A parametric study is then conducted using the model and compared with codes provisions. Strength and ductility of confined concrete are of primary concern. Variables considered are yield stress of steel tube and column diameter. The assessment of column performance is based on axial load carrying capacities and enhancements of both strength and ductility due to confinement. Two parameters namely strength enhancement factor (Kf) and ductility index (μ) are clearly defined and introduced for assessment. Results indicate that both concrete strength and ductility of CFT columns are enhanced but to different extents. The ductile behaviors are significantly evident. The increase in yield stress of steel tube has a minimal effect on concrete strength but pronounced effect on concrete ductility. However, reduction in ductility is associated with using high-tensile steel of Grade 70. The overall findings indicate that the use of high-strength tube in CFT columns is not promising. This finding may seriously be considered in seismic design.http://www.sciencedirect.com/science/article/pii/S1110016812000439Axial strengthDuctilityConfinementConcrete-filled steel columnsFinite element technique |
| spellingShingle | Mohamed Mahmoud El-Heweity On the performance of circular concrete-filled high strength steel columns under axial loading Alexandria Engineering Journal Axial strength Ductility Confinement Concrete-filled steel columns Finite element technique |
| title | On the performance of circular concrete-filled high strength steel columns under axial loading |
| title_full | On the performance of circular concrete-filled high strength steel columns under axial loading |
| title_fullStr | On the performance of circular concrete-filled high strength steel columns under axial loading |
| title_full_unstemmed | On the performance of circular concrete-filled high strength steel columns under axial loading |
| title_short | On the performance of circular concrete-filled high strength steel columns under axial loading |
| title_sort | on the performance of circular concrete filled high strength steel columns under axial loading |
| topic | Axial strength Ductility Confinement Concrete-filled steel columns Finite element technique |
| url | http://www.sciencedirect.com/science/article/pii/S1110016812000439 |
| work_keys_str_mv | AT mohamedmahmoudelheweity ontheperformanceofcircularconcretefilledhighstrengthsteelcolumnsunderaxialloading |