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Title |
Effects of Reinforcing Index of Transverse Reinforcement and Axial Load Level on Ductility of Lightweight Aggregate Concrete Columns
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Authors |
임채림(Chae-Rim Im) ; 양근혁(Keun-Hyeok Yang) |
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DOI |
https://doi.org/10.4334/JKCI.2023.35.3.255 |
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Keywords |
기둥; 경량골재 콘크리트; 띠철근; 축하중비; 휨 연성 column; lightweight aggregate concrete; transverse reinforcement; axial load ratio; flexural ductility |
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Abstract |
The purpose of this study is to examine the effect of the volumetric index (w_{vh}) of transverse reinforcement and axial load level (N_{u}/A_{g}*f_{ck}) on the flexural ductility of lightweight aggregate concrete (LWAC) columns subjected to constant axial loads and cyclic lateral loads. Five LWAC column specimens were prepared with different parameters including the amount of transverse reinforcement, compressive strength of concrete, type of supplementary ties, and N_u/A_g*f_ck. The flexural ductility of columns was assessed by using different indicators, including the equivalent damping coefficient, displacement ductility ratio (mu_{DELTA}), and cumulative work damage indicator. The values of mu_{DELTA} and the work damage indicator determined at 80 % peak load at the descending branch of the lateral load-displacement curves for LWAC columns were found to be 41 % and 45 % lower, respectively, when compared to equivalent normal-weight concrete (NWC) columns. This implies that LWAC columns with a lower concrete required a higher w_{vh} than NWC columns to achieve the same level of ductility level. This tendency was more notable for columns experiencing a higher N_{u}/A_{g}*f_{ck}.
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