A modifying method of earthquake ground motion for matching multi-dimensional nuclear power plants design response spectra and peak values
SHENG Tao1 SHI Wei-xing1 XIE Yi-tong2 YUAN Jun3
1. Research Instute of Structural Engineering and Disaster Reduction,Tongji University,Shanghai 200092,China; 2.School of Civil Engineering,Xian University of Architecture and Technology Xian 710055,China;
Abstract：According to the specificity of nuclear power plant structures, a modifying method of earthquake ground motion was proposed for matching multi-dimensional nuclear power plants design response spectra and peak values of ground acceleration (PGA), ground velocity (PGV) and ground displacement (PGD). First, the second cardinal B- spline wavelet was used to simulate multi-dimensional earthquake ground motion. Then real earthquake records were decomposed into several wavelet components by the fast algorithms of discrete wavelet transform. On the one hand, the wavelet components which affect the PGA, PGV and PGD of each direction can be searched out; on the other hand, the convergence quality of the syntheses wavelet method can be improved by the preliminary modification of wavelet coefficients. By iterations, the multi-dimensional target response spectra and PGA, PGV and PGD can be matched simultaneously. Four groups of three-dimensional real records which represent different earthquake groups were used to verify the feasibility of the modifying method. The results of the numerical examples demonstrate that the algorithms not only retain the time-frequency temporal features of the real earthquake records, but also satisfy the precision demand of codes for seismic design of nuclear power plants.
2012, Vol. 31 
