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Title |
Evaluation of Axial Strains of Reinforced Concrete Columns
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DOI |
https://doi.org/10.4334/JKCI.2013.25.1.019 |
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Keywords |
축방향변형률 ; 반복하중 ; 철근콘크리트 기둥 ; 축력 ; 소성힌지 axial strain ; reversed cyclic loading ; reinforced concrete columns ; axial force ; plastic hinge |
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Abstract |
The longitudinal axial strain in the plastic hinge region of reinforced concrete (RC) columns influences on the structural behavior of RC structures subjected to reversed cyclic loading. This strain decreases the effective compressive strength of concrete and increases the lateral displacements between stories by causing the elongation of member length. This paper investigated the effects of the axial force on the elongation of a RC member by using a sectional analysis of RC members. The analytical and experimental results indicated that the axial force decreased the axial strain in the plastic hinge region of RC columns. In this study, a model was proposed to predict the axial strain of RC columns. The proposed model considering the effects of axial force ratio consisted of three path types ; Path 1-loading region, Path 2-unloading region, and Path 3-reversing cyclic loading region. The axal strains predicted by the proposed model were compared with the test results of RC columns with various axial force ratios, and agreed reasonably with the observed longitudinal strains.
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