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Steel and Composite Structures Volume 43, Number 2, April25 2022 , pages 139-1521 DOI: https://doi.org/10.12989/scs.2022.43.2.139 |
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Seismic behavior of steel truss reinforced concrete L-shaped columns under combined loading |
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Fan Ning, Zongping Chen, Ji Zhou and Dingyi Xu
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| Abstract | ||
| Steel-reinforced concrete (SRC) L-shaped column is the vertical load-bearing member with high spatial adaptability. The seismic behavior of SRC L-shaped column is complex because of their irregular cross sections. In this study, the hysteretic performance of six steel truss reinforced concrete L-shaped columns specimens under the combined loading of compression, bending, shear, and torsion was tested. There were two parameters, i.e., the moment ratio of torsion to bending (γ) and the aspect ratio (column length-to-depth ratio (Φ). The failure process, torsion-displacement hysteresis curves, and bending-displacement hysteresis curves of specimens were obtained, and the failure patterns, hysteresis curves, rigidity degradation, ductility, and energy dissipation were analyzed. The experimental research indicates that the failure mode of the specimen changes from bending failure to bending-shear failure and finally bendingtorsion failure with the increase of γ. The torsion-displacement hysteresis curves were pinched in the middle, formed a slip platform, and the phenomenon of "load drop" occurred after the peak load. The bending-displacement hysteresis curves were plump, which shows that the bending capacity of the specimen is better than torsion capacity. The results show that the steel truss reinforced concrete L-shaped columns have good collapse resistance, and the ultimate interstory drift ratio more than that of the Chinese Code of Seismic Design of Building (GB50011-2014), which is sufficient. The average value of displacement ductility coefficient is larger than rotation angle ductility coefficient, indicating that the specimen has a better bending deformation resistance. The specimen that has a more regular section with a small Φ has better potential to bear bending moment and torsion evenly and consume more energy under a combined action. | ||
| Key Words | ||
| compression-bending-shear-torsion combined action; hysteretic behavior; L-shaped columns; quasi-static test; steel truss reinforced concrete | ||
| Address | ||
| Fan Ning:College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China Zongping Chen:1)College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China 2)Key Laboratory of Disaster Prevention and Structure Safety of Chinese Ministry of Education, Nanning 530004, China Ji Zhou:College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China Dingyi Xu:College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China | ||