Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5478139 | Nuclear Engineering and Technology | 2017 | 9 Pages |
Abstract
The relative displacement of a piping system installed between isolated and nonisolated structures in a severe earthquake might be larger when without a seismic isolation system. As a result of the relative displacement, the seismic risks of some components in the building could increase. The possibility of an increase in seismic risks is especially high in the crossover piping system in the buildings. Previous studies found that an elbow which could be ruptured by low-cycle ratcheting fatigue is one of the weakest elements. Fatigue curves for elbows were suggested based on component tests. However, it is hard to find a quantitative evaluation of the ultimate state of piping elbows. Generally, the energy dissipation of a solid structure can be calculated from the relation between displacement and force. Therefore, in this study, the ultimate state of the pipe elbow, normally considered as failure of the pipe elbow, is defined as leakage under in-plane cyclic loading tests, and a failure estimation method is proposed using a damage index based on energy dissipation.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Bub-Gyu Jeon, Sung-Wan Kim, Hyoung-Suk Choi, Dong-Uk Park, Nam-Sik Kim,