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Decoupling criterion for elastic-plastic seismic analysis of large-scale complex piping systems in nuclear power plants

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Abstract

This paper proposes an elastic-plastic-based decoupling criterion that can be applied to the seismic analysis of large-scale complex piping systems in nuclear power plants under beyond design basis earthquakes. First, the existing elastic-based decoupling criteria for seismic analyses were critically reviewed. Next, the effect of plasticity on the decoupling criteria was investigated by considering the equivalent damping and stiffness reduction. Finally, the decoupling criterion considering plasticity was developed based on the changes resulting from existing decoupling criteria. The validity of the proposed decoupling criterion was confirmed through its application to an analysis of a real piping system.

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Abbreviations

m :

Mass

c :

Damping coefficient

k :

Stiffness

ω :

Natural frequency

x :

Displacement

ζ :

Damping ratio

e :

Frequency error rate in undamped system

e d :

Frequency error rate in damped system

r f :

Frequency ratio

r m :

Mass ratio

p:

Primary system

s:

Secondary system

c:

Combined system

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Acknowledgments

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) (No. 20171520 101650 and No. 20181510102380).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Korea University, Seoul, 02841, Korea

    Soo-Bin Kim & Yun-Jae Kim

  2. Department of Nuclear Engineering, Sejong University, Seoul, 05006, Korea

    Jong-Sung Kim

Authors
  1. Soo-Bin Kim
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  2. Yun-Jae Kim
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  3. Jong-Sung Kim
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Corresponding author

Correspondence to Jong-Sung Kim.

Additional information

Jong-Sung Kim is an Associate Professor at the Department of Nuclear Engineering, Sejong University, Seoul, Korea. He received his Ph.D. in Mechanical Engineering from Yonsei University. His research interests include residual stresses, fatigue, fracture, and damage mechanics.

Soo-Bin Kim is a candidate for the Master degree of Engineering in Mechanical Engineering, Korea University, Seoul, Korea. He received his B.S. degree in 2018 from Korea University. His research interests include structural integrity assessments based on fracture mechanics using computational analysis.

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Kim, SB., Kim, YJ. & Kim, JS. Decoupling criterion for elastic-plastic seismic analysis of large-scale complex piping systems in nuclear power plants. J Mech Sci Technol 34, 4563–4573 (2020). https://doi.org/10.1007/s12206-020-1015-5

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  • DOI: https://doi.org/10.1007/s12206-020-1015-5

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