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Title |
Evaluation of Curvature and Displacement Ductility Ratios of Lightweight Aggregate Concrete Columns
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DOI |
https://doi.org/10.4334/JKCI.2022.34.3.235 |
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Keywords |
경량골재 콘크리트; 변위 연성; 곡률 연성; 비선형 해석 lightweight aggregate concrete; displacement ductility; curvature ductility; nonlinear analysis |
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Abstract |
The objective of this study is to formulate design models for the curvature and displacement ductility ratios of lightweight aggregate concrete (LWAC) columns. In the nonlinear analysis of the moment-curvature relationship and the lateral load-displacement relationship of the columns, the increase in concrete brittleness due to the decrease in unit weight () of concrete was considered. The curvature ductility ratio of normal-weight concrete (NWC) columns was formulated from a regression analysis using analytical data compiled from the extensive parametric study by the nonlinear analysis procedure. A correction factor was then introduced for the curvature ductility ratio of LWAC to consider the common tendency that the ductility of columns decreases with the decrease in . The curvature ductility ratio model was converted into a displacement ductility ratio from the idealized distribution of curvature along the column length and the equivalent plastic hinge length. The mean and standard deviation of the ratios between predictions and experiments for the displacement ductility ratio are 0.96 and 0.17, respectively, for NWC columns, and 1.08 and 0.16, respectively, for LWAC columns.
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