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Title |
Vibrational Properties of High Damping Polymer Concrete with Hybrid Damper
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Authors |
김정진(Jeong-Jin Kim) ; 최경석(Kyung-Suk Choi) ; 위준우(Joon-Woo We) ; 석원균(Won-Kyun Seok) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.5.135 |
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Keywords |
폴리머 콘크리트; 주파수 응답함수; 감쇠비; 복합구조 댐퍼 Polymer concrete; Frequency response function; Damping ratio; Hybrid damper |
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Abstract |
In the case of a concrete structure, vibration problems occur under various conditions because of its low damping performance. To solve this problem, a study on the high damping performance of the polymer concrete with hybrid damper has recently been increased. Since water is not used in polymer concrete, the curing time is short. Also, the physical properties and dynamic properties of polymer concrete are quite excellent. So polymer concrete is widely expected to be used for structural materials. The hybrid damper is the structural system that consists of steel balls and viscous fluid inside the pipe which is embedded in polymer concrete. It can reduce the structural vibrations through the energy dissipation mechanism of viscous fluid and steel balls. In this study, the physical and dynamic properties of polymer concrete with hybrid damper were compared with ordinary concrete. As a result, the elasticity coefficient and the strength of the polymer concrete with hybrid damper were so much excellent. In particular, the tensile strength was 6.5 to 10 times higher than ordinary concrete. The frequency response function and damping ratio were also compared. As a result, the dynamic Stiffness of the polymer concrete was 25% greater than that of ordinary concrete. The damping ratio of the polymer concrete was approximately 3 times higher than that of ordinary concrete. Although the dynamic stiffness of the hybrid damper showed similar tendency, the damping ratio was 3.5 times higher than that of ordinary concrete. Therefore, the polymer concrete with hybrid damper was superior to ordinary concrete.
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