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| Tests and finite element analysis for dynamic response of hollow box concrete-encased CFST columns under lateral impact |
| JIA ZhiLu，WANG Rui |
| College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
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Abstract The hollow box concrete-encased CFST (concrete-filled steel tubular) column consists of reinforced concrete and concrete filled steel tube, drop hammer test machine based on independent research and development carries out the box composite columns impact experiments to study its impact behavior, focusing the effect of boundary conditions, impact height and axial compression ratio on the time history of impact force and midspan displacement. In addition, based on the experiment, a finite element analysis model is developed by ANSYS/LS-DYNA software to analyze energy dissipation of each element. The experimental results show that the time history curve of impact force is developed from two stage to three stage with the increase of impact height, and the effect of encased concrete filled steel tube is gradually obvious; with the boundary conditions changing, the anti-deformation capacity of fixed ends is better than that of supported simply at both ends; and the axial compression ratio has little influence on the dynamic response of the member; When the impact energy is large, the energy absorbed by the steel tube concrete reaches 1/3, and the impact resistance is obvious.
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Received: 24 November 2017
Published: 28 April 2019
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