Steel and Composite Structures

  • 제13권3호
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  • Pages.277-293
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  • 2012
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Numerical analysis of the axially loaded concrete filled steel tube columns with debonding separation at the steel-concrete interface

  • 투고 : 2011.12.21
  • 심사 : 2012.05.30
  • 발행 : 2012.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

The interaction between steel tube and concrete core is the key design considerations for concrete-filled steel tube columns. In a concrete-filled steel tube (CFST) column, the steel tube provides confinement to the concrete core which permits the composite action among the steel tube and the concrete. Due to construction faults and plastic shrinkage of concrete, the debonding separation at the steel-concrete interface weakens the confinement effect, and hence affects the behaviour and bearing capacity of the composite member. This study investigates the axial loading behavior of the concrete filled circular steel tube columns with debonding separation. A three-dimensional nonlinear finite element model of CFST composite columns with introduced debonding gap was developed. The results from the finite element analysis captured successfully the experimental behaviours. The calibrated finite element models were then utilized to assess the influence of concrete strength, steel yield stress and the steel-concrete ratio on the debonding behaviour. The findings indicate a likely significant drop in the load carrying capacity with the increase of the size of the debonding gap. A design formula is proposed to reduce the load carrying capacity with the presence of debonding separation.

키워드

참고문헌

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피인용 문헌

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  3. Experimental investigation of the flexural behavior of CFST trusses with interfacial imperfection vol.137, 2017, https://doi.org/10.1016/j.jcsr.2017.06.009
  4. Vertical Dynamic Response of a Concrete Filled Steel Tube due to Transient Impact Load: Analytical Solution vol.16, pp.01, 2016, https://doi.org/10.1142/S0219455416400149
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  10. Stressing State Analysis on a Single Tube CFST Arch Under Spatial Loads vol.9, pp.23, 2019, https://doi.org/10.3390/app9235039
  11. Axial compressive behaviour of concrete-filled steel tubular columns with interfacial damage vol.23, pp.6, 2012, https://doi.org/10.1177/1369433219891639
  12. Experimental and numerical investigation of cross-shaped stub CFSTs under axial compression vol.73, pp.23, 2012, https://doi.org/10.1680/jmacr.19.00505