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Title |
Evaluation of Shear Capacity of Continuous All-Lightweight Aggregate Concrete Beams without Shear Reinforcing Bars
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Authors |
임채림(Chae-Rim Im) ; 문주현(Ju-Hyun Mun) ; 양근혁(Keun-Hyeok Yang) ; 응우옌 훙 퐁(Nguyen Hung Phong) |
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DOI |
https://doi.org/10.4334/JKCI.2023.35.4.357 |
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Keywords |
경량골재 콘크리트; 전단내력; 연속보; 골재 최대치수 all-lightweight aggregate concrete; shear capacity; continuous beams; maximum aggregate size |
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Abstract |
This study investigated the shear behavior of two-span beams made of all-lightweight aggregate concrete (ALWAC) and verified the structural safety of the shear capacity specified in ACI 318-19, AIJ, and EC 2. The main parameters investigated were concrete type and maximum aggregate size (d_a). To examine the shear transfer of concrete, three two-span continuous beams with different d_a and without shear reinforcing bars were prepared for each concrete type (ALWAC and normal-weight concrete, NWC). Test results showed that the normalized shear capacity and aggregate interlocking action index decreased by 14.6 % and 13.4 %, respectively, when d_a decreased by 75 %. These values were approximately 27.5 % and 17 % lower for the ALWAC beams than the NWC beams, respectively. Consequently, the degree of safety specified in the design codes of ACI 318-19, AIJ, and EC 2 for the concrete transfer force in a two-span beam also decreased as d_a decreased. On the other hand, Yang et al.’s model, which was modified to consider the external force applied to beams subjected to two-point top load, provided accurate estimates of the shear capacity of continuous beams, even though it did not consider the d_a function.
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