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Steel and Composite Structures Volume 47, Number 5, June 10 2023 , pages 645-661 DOI: https://doi.org/10.12989/scs.2023.47.5.645 |
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Analytical study of concrete-filled steel tubular stub columns with double inner steel tubes |
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Pouria Ayough, Yu-Hang Wang and Zainah Ibrahim
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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 CFSTDIST 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. | ||
| Key Words | ||
| composite structure; concrete-filled; finite element; nonlinear analysis; steel tubular column | ||
| Address | ||
| Pouria Ayough and Yu-Hang Wang: School of Civil Engineering, Chongqing University, Chongqing 400045, China Zainah Ibrahim: Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia | ||