2겹 및 3겹 벨로우즈 신축배관이음의 휨 변형에 대한 내진성능평가
Seismic Performance Evaluation on Bending Deformation of 2-Ply and 3-Ply Bellows Expansion Pipe Joints
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초록
배관의 변형 능력을 향상할 수 있는 지진분리이음의 적용은 내진성능을 향상할 수 있는 효과적인 방법이다. 축 방향의 팽창 및 수축,휨 변형에 대한 능력이 있는 지진분리이음은 변형이 예상되는 위치에 설치하여 배관을 안전하게 보호하기 위한 목적으로 사용된다. 벨로우즈는 유연하며 강성이 낮으므로 큰 변형에 대응하는 능력이 뛰어나기 때문에 지진분리이음으로 사용할 수 있다. 이 연구에서는 2겹 및 3겹 벨로우즈 시험체의 휨 변형에 대한 내진성능과 한계상태를 평가하였다. 내진성능은 지진하중으로 인한 저주기 피로를 고려하기 위하여 점진반복하중을 적용하여 평가하였다. 평가된 내진성능의 한계상태에 대한 여유도를 확인하기 위하여 일정한 진폭의 반복하중을 적용한 실험을 수행하였다. 실험결과 벨로우즈 시험체는 스테인리스 강재로 제작되어 연신율이 높아 3겹 벨로우즈 시험체의 최대 가력 변위에서도 2겹 벨로우즈시험체는 3 사이클 이내로 저항하는 한계성능을 가짐을 확인할 수 있었다.
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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