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Title |
Limit State Evaluation of Elbow Components Connected with Flexible Groove Joints
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Authors |
김성완(Sung-Wan Kim) ; 윤다운(Da-Woon Yun) ; 전법규(Bub-Gyu Jeon) ; 박동욱(Dong-Uk Park) ; 장성진(Sung-Jin Chang) |
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DOI |
https://doi.org/10.11112/jksmi.2024.28.3.91 |
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Keywords |
주기하중 프로토콜; 엘보 요소; 유동식 그루브 조인트; 한계상태 평가; 배관시스템 Cyclic loading protocol; Elbow component; Flexible groove joint; Limit state evaluation; Piping system |
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Abstract |
Piping systems are crucial facilities used in various industries, particularly in areas related to daily life and safety. Piping systems are fixed to the main structures of buildings and facilities but do not support external loads and serve as non-structural elements performing specific functions. Piping systems are affected by relative displacements owing to phase differences arising from different behaviors between two support points under seismic loads; this can cause damage owing to the displacement-dominant cyclic behavior. Fittings and joints in piping systems are representative elements that are vulnerable to seismic loads. To evaluate the seismic performance and limit states of fittings and joints in piping systems, a high-stroke actuator is required to simulate relative displacements. However, this is challenging because only few facilities can conduct these experiments. Therefore, element-level experiments are required to evaluate the seismic performance and limit states of piping systems connected by fittings and joints. This study proposed a method to evaluate the seismic performance of an elbow specimen that includes fittings and joints that are vulnerable to seismic loads in vertical piping systems. The elbow specimen was created by connecting straight pipes to both ends of a 90° pipe elbow using flexible groove joints. The seismic performance of the elbow specimen was evaluated using a cyclic loading protocol based on deformation angles. To determine the margin of the evaluated seismic performance, the limit states were assessed by applying cyclic loading with a constant amplitude.
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