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Title |
Seismic Performance Evaluation on Bending Deformation of 2-Ply and 3-Ply Bellows Expansion Pipe Joints
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Authors |
김성완(Sung-Wan Kim) ; 장성진(Sung-Jin Chang) ; 박동욱(Dong-Uk Park) ; 전법규(Bub-Gyu Jeon) |
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DOI |
https://doi.org/10.11112/jksmi.2023.27.2.33 |
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Keywords |
벨로우즈; 저주기 피로; 내진성능; 지진분리이음 Bellows; Low-cycle fatigue; Seismic performance; Seismic separation joint |
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Abstract |
The application of seismic separation joints that can improve the deformation capacity of piping is an effective way to improve seismicperformance. Seismic separation joints capable of axial expansion and bending deformation are installed where deformation is expected and used forthe purpose of safely protecting the piping. Bellows are flexible and have low stiffness, so they can be used as seismic separation joints because theyhave excellent ability to respond to relatively large deformation. In this study, the seismic performance and limit state for bending deformation of 2-plyand 3-ply bellows specimens were evaluated. Seismic performance was evaluated by applying an increasing cyclic load to consider low-cycle fatiguedue to seismic load. In order to confirm the margin for the limit state of the evaluated seismic performance, an experiment was conducted in whicha cyclic loading of constant amplitude was applied. As a result of the experiment, it was confirmed that the bellows specimen was made of stainlesssteel and had a high elongation, so that the 2-ply bellows specimen had the limit performance of resisting within 3 cycles even at the maximum forceddisplacement of the 3-ply bellows specimen.
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