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Analysis of Finite Element Mechanism of Axial Compressive Behavior of T-Shaped Stiffened Concrete-Filled Steel Tubular Stub Columns After Uniform Fire Exposure

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Abstract

Based on the reasonable determination of material constitutive relationship and interaction model between concrete and steel tube, a finite element model of T-shaped stiffened concrete-filled steel tube (TSCFST) stub column exposed to uniform fire was established, and model reliability was verified. Through the FE model, the working mechanism of the model in the whole process of loading was analyzed in detail. In the process of axial compression, the load distributions of steel tube and concrete, and the interaction between steel tube and concrete were discussed. This paper analyzed the effects of the main factors on residual bearing capacity of TSCFST stub columns, and put forward the calculation formula of the residual bearing capacity of TSCFST stub columns after uniform fire exposure.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (Grant No. 51208246), and Foundation of Key Laboratory of Structures Dynamic Behavior and Control (Ministry of Education) in Harbin Institute of Technology.

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Author notes

  1. T. Zhang and X. Lyu have contributed equally to this work.

Authors and Affiliations

  1. School of Civil Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning, China

    Tong Zhang, Haiqing Liu & Yang Xu

  2. School of Resource and Civil Engineering, Liaoning Institute of Science and Technology, Benxi, 117004, Liaoning, China

    Tong Zhang

  3. Advanced and Sustainable Infrastructure Materials Group, Transportation and Civil Buildings College, Foshan University, Foshan, 528000, Guangdong, China

    Xuetao Lyu

  4. Key Lab of Structures Dynamic Behavior and Control, Ministry of Education, Harbin Institute of Technology, Harbin, 150090, Heilongjiang, China

    Xuetao Lyu

  5. School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia

    Yang Yu

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  1. Tong Zhang
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Correspondence to Xuetao Lyu.

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Zhang, T., Lyu, X., Liu, H. et al. Analysis of Finite Element Mechanism of Axial Compressive Behavior of T-Shaped Stiffened Concrete-Filled Steel Tubular Stub Columns After Uniform Fire Exposure. Int J Steel Struct 21, 836–849 (2021). https://doi.org/10.1007/s13296-021-00476-z

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