Steel and Composite Structures

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Analysis of concrete-filled steel tubular columns with "T" shaped cross section (CFTTS)

  • Wang, Qin-Ting (College of Civil Engineering, Henan Polytechnic University) ;
  • Chang, Xu (College of Civil Engineering, Henan Polytechnic University)
  • Received : 2012.05.14
  • Accepted : 2013.06.03
  • Published : 2013.07.25
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Abstract

This paper presents a numerical study of axially loaded concrete-filled steel tubular columns with "T" shaped cross section (CFTTS) based on the ABAQUS standard solver. Two types of columns with "T" shaped cross section, the common concrete-filled steel tubular columns with "T" shaped cross section (CCFTTS) and the double concrete-filled steel tubular columns with "T" shaped cross section (DCFTTS), are discussed. The failure modes, confining effects and load-displacement curves are analyzed. The numerical results indicate that both have the similar failure mode that the steel tubes are only outward buckling on all columns' faces. It is found that DCFTTS columns have higher axial capacities than CCFTTS ones duo to the steel tube of DCFTTS columns can plays more significant confining effect on concrete. A parametric study, including influence of tube thickness, concrete strength and friction coefficient of tube-concrete interface on the axial capacities is also carried out. Simplified formulae were also proposed based on this study.

Keywords

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