Steel and Composite Structures

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Analytical study of concrete-filled steel tubular stub columns with double inner steel tubes

  • Pouria Ayough (School of Civil Engineering, Chongqing University) ;
  • Yu-Hang Wang (School of Civil Engineering, Chongqing University) ;
  • Zainah Ibrahim (Department of Civil Engineering, Faculty of Engineering, University of Malaya)
  • Received : 2022.11.27
  • Accepted : 2023.04.20
  • Published : 2023.06.10
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Abstract

Concrete-filled steel tubular columns with double inner steel tubes (CFST-DIST) are a novel type of composite members developed from conventional concrete-filled steel tubular (CFST) columns. This paper investigates the structural performance of circular CFST-DIST stub columns using nonlinear finite element (FE) analysis. A numerical model was developed and verified against existing experimental test results. The validated model was then used to compare circular CFST-DIST stub columns' behavior with their concrete-filled double skin steel tubular (CFDST) and CFST counterparts. A parametric study was performed to ascertain the effects of geometric and material properties on the axial performance of CFST-DISTs. The FE results and the available test data were used to assess the accuracy of the European and American design regulations in predicting the axial compressive capacity of circular CFST-DIST stub columns. Finally, a new design model was recommended for estimating the compressive capacity of CFST-DISTs. Results clarified that circular CFST-DIST columns had the advantages of their CFST counterparts but with better ductility and strength-to-weight ratio. Besides, the investigated design codes led to conservative predictions of the compressive capacity of circular CFST-DIST columns.

Keywords

Acknowledgement

This research was funded by a grant from the National Natural Science Foundation of China (52278144). The authors would like to acknowledge the support.

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