Steel and Composite Structures

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Numerical and experimental analysis on the axial compression performance of T-shaped concrete-filled thin-walled steel

  • Xuetao Lyu (Advanced and Sustainable Infrastructure Materials Group, School of Transportation and Civil Engineering & Architecture, Foshan University) ;
  • Weiwei Wang (School of Architectural Engineering, Guangzhou Vocational and Technical University of Science and Technology) ;
  • Huan Li (Centre for Infrastructure Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University) ;
  • Jiehong Li (Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales) ;
  • Yang Yu (Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales)
  • Received : 2023.06.29
  • Accepted : 2023.11.07
  • Published : 2024.02.25
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Abstract

The research comprehensively studies the axial compression performance of T-shaped concrete-filled thin-walled steel tubular (CTST) long columns after fire exposure. Initially, a series of tests investigate the effects of heating time, load eccentricity, and stiffeners on the column's performance. Furthermore, Finite Element (FE) analysis is employed to establish temperature and mechanical field models for the T-shaped CTST long column with stiffeners after fire exposure, using carefully determined key parameters such as thermal parameters, constitutive relations, and contact models. In addition, a parametric analysis based on the numerical models is conducted to explore the effects of heating time, section diameter, material strength, and steel ratio on the axial compressive bearing capacity, bending bearing capacity under normal temperature, as well as residual bearing capacity after fire exposure. The results reveal that the maximum lateral deformation occurs near the middle of the span, with bending increasing as heating time and eccentricity rise. Despite a decrease in axial compressive load and bending capacity after fire exposure, the columns still exhibit desirable bearing capacity and deformability. Moreover, the obtained FE results align closely with experimental findings, validating the reliability of the developed numerical models. Additionally, this study proposes a simplified design method to calculate these mechanical property parameters, satisfying the ISO-834 standard. The relative errors between the proposed simplified formulas and FE models remain within 10%, indicating their capability to provide a theoretical reference for practical engineering applications.

Keywords

Acknowledgement

This research was supported by the National Natural Science Foundation of China (Grant No. 51208246). The authors are deeply grateful for the financial support from funding body.

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