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Experimental study on impact behaviour of concrete-filled steel tubes at elevated temperatures up to 800 °C

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Abstract

The dynamic behaviour of normal strength concrete-filled steel tubes (CFT) at elevated temperatures up to 800 °C under axial impact loading was experimentally studied by using a newly developed spilt Hopkinson pressure bar (SHPB) together with an electrical furnace. The effects of high temperature, impact velocity, steel ratio and slenderness ratio on the impact behaviour of CFT at elevated temperatures were experimentally studied. The stress and strain time history curves of the tested specimens were recorded to analyze the impact behaviour of CFT at elevated temperatures. The failure modes and the effects of the experimental parameters on the impact resistance of CFT are discussed. The test results showed that normal strength concrete-filled steel tube at elevated temperatures had a more excellent impact resistance in the paper than that described in Huo et al. (2009). A simplified calculation method was updated by introducing the reasonable dynamic increase factor model of hot concrete to reasonably assess the impact resistance of CFT at elevated temperatures.

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Acknowledgments

The research described in this paper was conducted at the Center for Integrated Protection Research of Engineering Structures (CIPRES), Ministry of Education Key Laboratory of Building Safety and Efficiency of the Hunan University, under the supports of the National Natural Science Foundation project (Project No. 50778069), the Program for New Century Excellent Talents in University (NCET-11-0123) and the Program for Changjiang Scholars and Innovative Research Team Project (Project No. IRT0619).

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Correspondence to Jingsi Huo.

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Huo, J., He, Y. & Chen, B. Experimental study on impact behaviour of concrete-filled steel tubes at elevated temperatures up to 800 °C. Mater Struct 47, 263–283 (2014). https://doi.org/10.1617/s11527-013-0059-8

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