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Title |
Curvature Ductility Ratio Model for Lightweight Aggregate Concrete Shear Walls with Boundary Elements
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Authors |
오나경(Na-Kyung Oh) ; 양근혁(Keun-Hyeok Yang) ; 문주현(Ju-Hyun Mun) |
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DOI |
https://doi.org/10.4334/JKCI.2022.34.5.537 |
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Keywords |
전단벽; 경량골재 콘크리트; 곡률 연성비; 구속효과 shear walls; lightweight aggregate concrete; curvature ductility ratio; confinement |
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Abstract |
This study proposes a rational model to straightforwardly determine the curvature ductility ratio () of lightweight aggregate concrete (LWAC) shear walls considering the increase in brittleness with the decrease in concrete unit weight. The curvatures corresponding to the initial yielding state and 80 % peak load at the post-peak branch were mathematically derived from the Bernoulli’s principle, strain compatibility condition, and the equilibrium condition of forces at the critical section. The confinement effect at the boundary elements is reflected by using the stress-strain relationship of confined concrete proposed by Mun et al. The mathematical solutions for the curvatures and neutral axis depths are simplified from the numerous parametric studies conducted with extensive ranges of different variables. The mean and standard deviation of the ratios between the measured values and predictions using the proposed model were 1.04 and 0.09, respectively.
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