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Steel and Composite Structures Volume 28, Number 5, September10 2018 , pages 559-571 DOI: https://doi.org/10.12989/scs.2018.28.5.559 |
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Analysis and design of demountable circular CFST column-base connections |
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Dongxu Li, Jia Wang, Brian Uy, Farhad Aslani and Vipul Patel
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| Abstract | ||
| In current engineering practice, circular concrete-filled steel tubular (CFST) columns have been used as effective structural components due to their significant structural and economic benefits. To apply these structural components into steelconcrete composite moment resisting frames, increasing number of research into the column-base connections of circular CFST columns have been found. However, most of the previous research focused on the strength, rigidity and seismic resisting performance of the circular CFST column-base connections. The present paper attempts to investigate the demountability of bolted circular CFST column-base connections using the finite element method. The developed finite element models take into account the effects of material and geometric nonlinearities; the accuracy of proposed models is validated through comparison against independent experimental results. The mechanical performance of CFST column-base connections with both permanent and demountable design details are compared with the developed finite element models. Parametric studies are further carried out to examine the effects of design parameters on the behaviour of demountable circular CFST column-base connections. Moreover, the initial stiffness and moment capacity of such demountable connections are compared with the existing codes of practice. The comparison results indicate that an improved prediction method of the initial stiffness for these connections should be developed. | ||
| Key Words | ||
| circular concrete-filled steel tubular column; column-base connection; demountable; finite element analysis; design codes | ||
| Address | ||
| (1) Dongxu Li, Brian Uy: School of Civil Engineering, The University of Sydney, Sydney, NSW 2006, Australia; (2) Jia Wang: School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia; (3) Farhad Aslani: School of Civil, Environmental and Mining Engineering, The University of Western Australia, Crawley, WA 6009, Australia; (4) Vipul Patel: School of Engineering and Mathematical Sciences, La Trobe University, Bendigo, VIC 3552, Australia. | ||