Structural Engineering and Mechanics

  • 제22권5호
  • /
  • Pages.541-562
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  • 2006
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Self-consolidating concrete filled steel tube columns - Design equations for confinement and axial strength

  • Lachemi, M. (Department of Civil Engineering, Ryerson University) ;
  • Hossain, K.M.A. (Department of Civil Engineering, Ryerson University) ;
  • Lambros, V.B. (Lafarge Materials & Construction Inc.)
  • 투고 : 2004.08.11
  • 심사 : 2005.12.16
  • 발행 : 2006.03.30
⟨ 이전 논문 다음 논문 ⟩

초록

This paper compares the performance of axially loaded concrete filled steel tube (CFST) columns cast using a conventionally vibrated normal concrete (NC) and a novel self-consolidating concrete (SCC) made with a new viscosity modifying admixture (VMA). A total of sixteen columns with a standard compressive strength of about 50 MPa for both SCC and NC were tested by applying concentric axial load through the concrete core. Columns were fabricated without and with longitudinal and hoop reinforcement (Series I and Series II, respectively) in addition to the tube confinement. The slenderness of the columns expressed as height to diameter ratio (H/D) ranged between 4.8 and 9.5 for Series CI and between 3.1 and 6.5 for Series CII. The strength and ductility of SCC columns were found comparable to those of their NC counterparts as the maximum strength enhancement in NC columns ranged between 1.1% and 7.5% only. No significant difference in strain development was found due to the presence of SCC or NC or due to the presence of longitudinal and hoop reinforcement. Biaxial stress development in the steel tube as per von Mises yield criterion showed similar characteristics for both SCC and NC columns. The confined strength ($f^{\prime}_{cc}$) of SCC was found to be lower than that of NC and $f^{\prime}_{cc}$ also decreased with the increase of slenderness of the columns. Analytical models for the prediction of confined concrete strength and axial strength of CFST columns were developed and their performance was validated through test results. The proposed models were found to predict the axial strength of CFST columns better than existing models and Code based design procedures.

키워드

참고문헌

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피인용 문헌

  1. Experimental behaviour of high performance concrete-filled steel tubular columns vol.46, pp.4, 2008, https://doi.org/10.1016/j.tws.2007.10.001
  2. Compressive strength of circular concrete filled steel tube columns vol.56, 2012, https://doi.org/10.1016/j.tws.2012.03.008
  3. Performance of lightweight aggregate and self-compacted concrete-filled steel tube columns vol.25, pp.3, 2006, https://doi.org/10.12989/scs.2017.25.3.299
  4. Experimental study on the seismic performance of concrete filled steel tubular laced columns vol.26, pp.6, 2018, https://doi.org/10.12989/scs.2018.26.6.719
  5. Confinement of six different concretes in CFST columns having different shapes and slenderness vol.11, pp.2, 2006, https://doi.org/10.1007/s40091-019-0228-2
  6. Axial Load Behavior of Ultrahigh Strength Concrete-Filled Steel Tube Columns of Various Geometric and Reinforcement Configurations vol.6, pp.5, 2021, https://doi.org/10.3390/infrastructures6050066