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Title |
Prediction of Curvature Ductility in Reinforced Concrete Flexural Members Based on Reinforcement Tensile Strain
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Authors |
이대형(Dae-Hyoung Lee) ; 배수호(Su-Ho Bae) |
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DOI |
https://doi.org/10.4334/JKCI.2024.36.2.165 |
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Keywords |
철근콘크리트 휨부재; 곡률연성도; 연성파괴; 인장변형률/항복변형률 비 reinforced concrete flexural member; curvature ductility factor; ductile failure; ratio of tensile strain to yield strain |
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Abstract |
This study proposes a simplified ductility formula for predicting the ductile behavior of reinforced concrete flexural members. The formula takes into account concrete strength, rebar yield strength, and the quantity of reinforcement. In reinforced concrete structures, ensuring ductile failure at the ultimate state is a crucial design concept. To achieve this, revised design standards specify minimum allowable tensile strain and tension-controlled strain limits based on rebar yield strength. Consequently, a formula for calculating curvature ductility is presented, using the ratio of tensile strain at compressive concrete failure to yield strain as a variable. In this context, the influence of concrete strength and yield strength of reinforcement on curvature ductility was investigated. It was found that the difference in curvature ductility based on concrete strength was insignificant when considering tensile strain of rebar as a reference, and with higher yield strength of reinforcement, the curvature ductility decreased. The proposed formula aligns with previous research results and provides a more convenient means to predict curvature ductility.
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