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- Title
Seismic Response Effect on Base-Isolated Rigid Structures by Mass Eccentricity in Nuclear Plants.
- Authors
Shin, Tae-Myung; Lee, Byung-Chan
- Abstract
Featured Application: The results can be applicable to the plant equipment design for seismic enhancement. The purpose of this paper is to analyze the seismic response effect caused by the mass eccentricity of individual equipment when conducting base isolation for the improvement of the seismic performance of a nuclear power plant. Recent research has interpreted and confirmed through analysis and testing that base isolation for safety-related equipment in nuclear power plants is an efficient alternative to designing for excessive seismic loads. Depending on the equipment, unavoidable mass eccentricity can occur, which necessitates verification of the response impact caused by eccentricity. In this paper, we analyze the seismic response impact of equipment with mass eccentricity using small base isolators. To do so, sensitivity analysis of the seismic response due to mass eccentricity is conducted for a base-isolated concentrated mass model. Furthermore, three efficient mass eccentricity models suitable for testing are designed and manufactured. Simulation analyses using the finite element method (FEM) models are performed, followed by three-axis shake table tests to validate the seismic response impact of mass eccentricity. In conclusion, it is confirmed that applying small base isolators to equipment with mass eccentricity can affect seismic response impact to some extent when compared for a beyond-design-basis earthquake (BDBE).
- Subjects
SEISMIC response; NUCLEAR power plants; BASE isolation system; SHAKING table tests; ATOMIC mass; EARTHQUAKE resistant design
- Publication
Applied Sciences (2076-3417), 2023, Vol 13, Issue 24, p13330
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app132413330