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Title |
Evaluation of Ductility of Lightweight Aggregate Concrete T-beam Arranged with Maximum Longitudinal Reinforcement Ratio
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Authors |
양근혁(Keun-Hyeok Yang) ; 문주현(Ju-Hyun Mun) ; 이경호(Kyong-Ho Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.1.011 |
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Keywords |
보; 경량골재 콘크리트; 최대 주철근비; 휨 내력; 연성 beam; lightweight aggregate concrete; maximum longitudinal reinforcement ratio; moment capacity; ductility. |
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Abstract |
The objective of this study is to evaluate the applicability of the maximum longitudinal reinforcement ratio () specified in KCI 2017 provision to the lightweight aggregate concrete (LWAC) T-beams. Based on the flexural behavior obtained from four beam specimens governed by flexure and 2-dimensional nonlinear finite element analysis, the relationship between longitudinal reinforcement index and displacement ductility ratio was estimated. Test results revealed that the moment capacity and ductility of LWAC T-beams with the maximum depended on the concrete crushing in compression zone. The flexural capacity predicted using the equivalent stress block specified in KCI 2017 provision tended to overestimate the results measured in the beam specimens. Ultimately, the maximum specified in KCI 2017 provision needs to lower for LWAC beams to achieve the equivalent ductility to normal-weight concrete beams.
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