Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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An improved time-domain approach for the spectra-compatible seismic motion generation considering intrinsic non-stationary features

  • Feng Cheng (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology) ;
  • Jianbo Li (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology) ;
  • Zhixin Ding (State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, China Nuclear Power Engineering Co., Ltd.) ;
  • Gao Lin (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology)
  • Received : 2022.05.25
  • Accepted : 2022.11.20
  • Published : 2023.03.25
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Abstract

The dynamic structural responses are sensitive to the time-frequency content of seismic waves, and seismic input motions in time-history analysis are usually required to be compatible with design response spectra according to nuclear codes. In order to generate spectra-compatible input motions while maintaining the intrinsic non-stationarity of seismic waves, an improved time-domain approach is proposed in this paper. To maintain the nonstationary characteristics of the given seismic waves, a new time-frequency envelope function is constructed using the Hilbert amplitude spectrum. Based on the intrinsic mode functions (IMFs) obtained from given seismic waves through variational mode decomposition, a new corrective time history is constructed to locally modify the given seismic waves. The proposed corrective time history and time-frequency envelope function are unique for each earthquake records as they are extracted from the given seismic waves. In addition, a dimension reduction iterative technique is presented herein to simultaneously superimpose corrective time histories of all the damping ratios at a specific frequency in the time domain according to optimal weights, which are found by the genetic algorithm (GA). Examples are presented to show the capability of the proposed approach in generating spectra-compatible time histories, especially in maintaining the nonstationary characteristics of seismic records. And numerical results reveal that the modified time histories generated by the proposed method can obtain similar dynamic behaviors of AP1000 nuclear power plant with the natural seismic records. Thus, the proposed method can be efficiently used in the design practices.

Keywords

Acknowledgement

This research was supported by Grant 52178460 from the National Natural Science Foundation of China, DUT20TD209 from the Fundamental Research Funds for the Central Universities.

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