Steel and Composite Structures

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Axial compression behavior of circular recycled concrete-filled steel tubular short columns reinforced by silica fume and steel fiber

  • Chen, Juan (School of Urban Construction, Yangtze University) ;
  • Liu, Xuan (School of Urban Construction, Yangtze University) ;
  • Liu, Hongwei (School of Urban Construction, Yangtze University) ;
  • Zeng, Lei (School of Urban Construction, Yangtze University)
  • Received : 2017.08.08
  • Accepted : 2018.02.25
  • Published : 2018.04.25
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Abstract

This paper presents an experimental work for short circular steel tube columns filled with normal concrete (NAC), recycled aggregate concrete (RAC), and RAC with silica fume and steel fiber. Ten specimens were tested under axial compression to research the effect of silica fume and steel fiber volume percentage on the behavior of recycled aggregate concrete-filled steel tube columns (RACFST). The failure modes, ultimate loads and axial load- strain relationships are presented. The test results indicate that silica fume and steel fiber would not change the failure mode of the RACFST column, but can increase the mechanical performances of the RACFST column because of the filling effect and pozzolanic action of silica fume and the confinement effect of steel fiber. The ultimate load, ductility and energy dissipation capacity of RACFST columns can exceed that of corresponding natural aggregate concrete-filled steel tube (NACFST) column. Design formulas EC4 for the load capacity NACFST and RACFST columns are proposed, and the predictions agree well with the experimental results from this study.

Keywords

Acknowledgement

Supported by : Yangtze University

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