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DING Fa-xing, YU Zhi-wu. Mechanical behavior of concrete filled circular steel tubular stub columns with axial pre-stress in steel tube[J]. Journal of Traffic and Transportation Engineering, 2006, 6(3): 57-61.
Citation: DING Fa-xing, YU Zhi-wu. Mechanical behavior of concrete filled circular steel tubular stub columns with axial pre-stress in steel tube[J]. Journal of Traffic and Transportation Engineering, 2006, 6(3): 57-61.
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Mechanical behavior of concrete filled circular steel tubular stub columns with axial pre-stress in steel tube

  • School of Civil Engineering and Architecture, Central South University, Changsha 410075, Hunan, China

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  • Author Bio:

    Ding Fa-xing(1979-), male, PhD, 86-731-2656540, dinfaxin@mail.csu.edu.cn

  • Received Date: 2005-11-27
  • Publish Date: 2006-09-25
    Abstract
  • Based on continuum mechanics, the calculation model for concrete filled circular steel tubes of concentric cylinders of circular steel tube with concrete core of entire section loaded with axial pre-stress in steel tube was determined, the theoretical calculation formulas for composite elastic modulus and composite stress-strain relationship of concrete filled circular steel tubular (CFST) stub columns with axial pre-stress in steel tube were presented, the axial stress-axial strain relationship of steel tube, the perimeter stress-strain relationship of steel tube, the axial stress-axial stain relationship and the radial stress-axial strain relationship of concrete core were analyzed, and the influence of the axial pre-stress ratio on mechanical behavior of columns was discussed.Analysis result indicates that the axial stiffness, radial stress, and axial strength of concrete core and the perimeter stress of steel tube decrease with the axial pre-stress increasing of steel tube, but the axial stress of steel tube increases, the confinement effect and ultimate capacity decrease, but the composite elastic modulus is hardly influenced.

     

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