Response spectra for nuclear structures on rock sites considering the near-fault directivity effect |
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| Authors: | Longjun Xu Shengchao Yang Lili Xie |
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| Institution: | 1. Department of Civil Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China
2. CCCC Highway and Bridge Consultants Co. Ltd., Beijing 100029, China |
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| Abstract: | Near-fault ground motions, potentially with large amplitude and typical velocity pulses, may significantly impact the performance
of a wide range of structures. The current study is aimed at evaluating the safety implications of the near-fault effect on
nuclear power plant facilities designed according to the Chinese code. To this end, a set of nearfault ground motions at rock
sites with typical forward-directivity effect is examined with special emphasis on several key parameters and response spectra.
Spectral comparison of the selected records with the Chinese and other code design spectra was conducted. The bi-normalized
response spectra in terms of different corner periods are utilized to derive nuclear design spectra. It is concluded that
nuclear design spectra on rock sites derived from typical rupture directivity records are significantly influenced both by
the earthquake magnitude and the rupture distance. The nuclear design spectra specified in the code needs to be adjusted to
reflect the near-fault directivity effect of large earthquakes. |
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| Keywords: | near-fault ground motion directivity response spectrum rock site nuclear design |
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