Nuclear Engineering and Technology

  • 제48권5호
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  • Pages.1237-1251
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  • 2016
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Potentiality of Using Vertical and Three-Dimensional Isolation Systems in Nuclear Structures

  • Zhou, Zhiguang (Research Institute of Structural Engineering and Disaster Reduction, Tongji University) ;
  • Wong, Jenna (Lawrence Berkeley National Laboratories) ;
  • Mahin, Stephen (Department of Civil and Environmental Engineering, 777 Davis Hall, University of California)
  • 투고 : 2015.09.26
  • 심사 : 2016.03.19
  • 발행 : 2016.10.25
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초록

Although the horizontal component of an earthquake response can be significantly reduced through the use of conventional seismic isolators, the vertical component of excitation is still transmitted directly into the structure. Records from instrumented structures, and some recent tests and analyses have actually seen increases in vertical responses in base isolated structures under the combined effects of horizontal and vertical ground motions. This issue becomes a great concern to facilities such as a Nuclear Power Plants (NPP), with specialized equipment and machinery that is not only expensive, but critical to safe operation. As such, there is considerable interest worldwide in vertical and three-dimensional (3D) isolation systems. This paper examines several vertical and 3D isolation systems that have been proposed and their potential application to modern nuclear facilities. In particular, a series of case study analyses of a modern NPP model are performed to examine the benefits and challenges associated with 3D isolation compared with horizontal isolation. It was found that compared with the general horizontal isolators, isolators that have vertical frequencies of no more than 3 Hz can effectively reduce the vertical in-structure responses for the studied NPP model. Among the studied cases, the case that has a vertical isolation frequency of 3 Hz is the one that can keep the horizontal period of the isolators as the first period while having the most flexible vertical isolator properties. When the vertical frequency of isolators reduces to 1 Hz, the rocking effect is obvious and rocking restraining devices are necessary.

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참고문헌

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  10. Parameters Affecting Dynamics of Three-Dimensional Seismic Isolation vol.25, pp.4, 2016, https://doi.org/10.1080/13632469.2018.1537902
  11. Influence of Vertical Equivalent Damping Ratio on Seismic Isolation Effectiveness of Nuclear Reactor Building vol.14, pp.15, 2021, https://doi.org/10.3390/en14154602
  12. Optimal Earthquake Intensity Measures for Probabilistic Seismic Demand Models of Base-Isolated Nuclear Power Plant Structures vol.14, pp.16, 2016, https://doi.org/10.3390/en14165163
  13. Vertical Seismic Isolation Device for Three-Dimensional Seismic Isolation of Nuclear Power Plant Equipment-Case Study vol.12, pp.1, 2016, https://doi.org/10.3390/app12010320