Influence of Vertical Equivalent Damping Ratio on Seismic Isolation Effectiveness of Nuclear Reactor Building

Xiuyun Zhu, Jianbo Li, Gao Lin and Rong Pan
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Xiuyun Zhu: Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China
Jianbo Li: Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China
Gao Lin: Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China
Rong Pan: Nuclear and Radiation Safety Center, Ministry of Ecology and Environment, Beijing 100082, China

Energies, 2021, vol. 14, issue 15, 1-20

Abstract: This paper aimed at evaluating the influence of different vertical equivalent damping ratios of a 3-dimensional combined isolation bearing (3D-CIB) as regards seismic response and isolation effectiveness. A comparative study of the seismic response in terms of acceleration floor response spectra (FRS), peak acceleration, displacement response of the nuclear reactor building, and dynamic response of the 3D-CIB was carried out. The results showed that: (1) the horizontal FRS is slightly influenced by the vertical equivalent damping ratio of 3D-CIB, whereas the increase of the vertical equivalent damping ratio has a significant effect on reducing the vertical FRS; (2) the peak vertical acceleration increased with the decrease in the vertical equivalent damping ratios of 3D-CIB and the difference of peak accelerations calculated by the damping ratio of 20 and 25% is within 10%; (3) the increase of the vertical equivalent damping ratio is capable of reducing the horizontal displacement and the rocking effect of the superstructure, and effectively controlling the vertical displacement amplitude; and (4) the vertical equivalent damping ratio of 3D-CIB has a slight effect on its axial force. Consequently, it is demonstrated that the increase of the vertical equivalent damping ratio is advantageous for isolation effectiveness. From the view of displacement control, it is suggested that the 3D-CIB with the vertical an equivalent damping ratio of 15~20% is appropriate and acceptable.

Keywords: 3D base-seismic isolation; 3-dimensional combined isolation bearing (3D-CIB); vertical equivalent damping ratio; isolation effectiveness (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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