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Title |
An Examination of the Minimum Reinforcement Ratio for Reinforced Concrete Flexural Members
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DOI |
https://doi.org/10.11112/jksmi.2017.21.6.035 |
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Keywords |
최소철근비 ; 콘크리트구조기준 ; 도로교설계기준 ; 포물-사각형 곡선 ; 연성도 Minimum reinforcement ratio ; CDC ; KHBDC ; P-r curve ; Ductility capacity |
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Abstract |
The minimum reinforcement ratio is an important design factor to prevent a brittle failure in RC flexural members. A minimum reinforcement ratio is presented by assuming an effective depth of cross-section and moment arm lever in CDC and KHBDC. In this study, it suggests that a rational method for minimum reinforcement ratio is calculated by material model and force equilibrium. As results, a minimum reinforcement ratio using a p-r curve in KHBDC is evaluated about 52~80% of recent design code's value and it induces an economical design. And also, a ductility capacity in case of placing this minimum reinforcement amount is evaluated about 89% of recent design code's value, but ductility in a member is 7 or more, so it has a sufficient ductility capacity. Therefore, it is judged that a minimum reinforcement ratio using p-r curve has a theoretical rationality, safety and economy in a flexural member design.
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