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Title |
Maximum Steel Ratio of Reinforced Concrete Flexural Members Using Material Factors
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Authors |
최승원(Seung-Won Choi) ; 이민희(Min-Hi Lee) ; 이기열(Gi-Yeol Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.2.127 |
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Keywords |
최대철근비; 재료계수; 포물선-사각형 곡선; 재료모델; 철근콘크리트 휨부재 maximum steel ratio; material factor; parabolic-rectangle stress-strain relationship; material model; reinforced concrete flexural member |
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Abstract |
This study proposes the maximum reinforcing steel ratio of reinforced concrete flexural member using the material factors and the nonlinear material model of concrete. For this purpose, the concrete material model defined by parabolic-rectangle stress-strain relationship defined by the current KCI model code 2017 and the material factors of reinforcing steel and concrete were adopted. and also, the maximum reinforcing steel ratio was induced by using the force equilibrium relationship between the maximum neutral axis depth and the strain compatibility condition of the flexural member cross section. In addition, the maximum reinforcing steel ratio was presented as a ratio for the corresponding balanced reinforcing steel ratio according to the yield strength of the tensile reinforcing steel to provide convenience of design practice. The maximum reinforcing steel ratio proposed in this study can guarantee the ductile failure of the reinforced concrete flexural member and secure the constructability and economical efficiency at the same time compared to the specifications of other design codes.
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