• Title/Summary/Keyword: effective area of circular hoops

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Evaluation of Effective Section Area of Shear Steel in Reinforced Concrete Circular Columns (철근콘크리트 원형기둥의 전단철근 유효단면적 평가)

  • 김장훈
    • Journal of the Korea Concrete Institute
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    • v.11 no.3
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    • pp.81-88
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    • 1999
  • In order to properly evaluate the shear strength of reinforced concrete circular columns due to the transverse shear reinforcement, the average of fractions of forces generated along the circular transverse hoops across the shear failure plane in the loading direction is calculated. For this, the center-to-center diameter of circular transverse hoops. spacing and the crack angle measured to the column longitudinal axis are considered. Using these variables, an equation representing the effective section area of circular transverse shear steel is proposed. The study result shows that the constant parameter. used for the calculation of the effective section area of circular hoops over the last 10 years, should not universally be applied any more. The use of the constant parameter may not seriously do harm to the evaluation of shear strength for circular columns with non-seismically designed transverse hoop reinforcement, since it gives slightly conservative results. However. for well-confined circular columns with close spacing or circular steel jacketing. it gives about 20% overestimation of the shear capacity contributed by the transverse hoop steel.

Theoretical and Experimental Study of Shear Strength of Concrete Circular Sections Using Steel Hoops (콘크리트 원형단면의 횡보강근에 의한 전단강도 평가 이론 및 실험)

  • 김장훈;정준언;홍성걸
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.515-520
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    • 2000
  • The state-of-the-practice design expressions currently used for the calculation of shear strength of concrete columns due to circular transverse hoop steel were reviewed. From this, it was found that the single valued constant effective section area of shear steel to be conservative in some degree that concrete sections built in non-seismic regions. A general expression as n alternative was suggested considering the wide range of section configurations. The theoretical prediction was validated through the experimental observations.

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