Effects of hanging wall/footwall ground motion on aseismic design spectra of China nuclear power plants

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (19) : 26-31.

HU Jinjun, ZHANG Yanjing, XIE Lili

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Abstract

With increasing demand for energy in central and western regions of China, the construction of inland nuclear power plants (NPPs) is bound to be put on the agenda. However, due to the stronger seismicity in central and western regions of China, nuclear power plants may be threatened by potential earthquakes. The aseismic design spectra of China NPPs were built in 1990s not considering hanging wall/footwall effect of near fault ground motion. Here, in order to ensure the safety of NPPs, influences of hanging wall/footwall effect on aseismic design spectra were studied. Based on 7 hanging wall/footwall records of earthquakes in China and abroad, using Guo-Wang method adopted in aseismic design spectra of China NPPs, effects of ground motion in different areas on NPPs’ aseismic design spectra were analyzed. Results showed that during short period, the response spectra values of hanging wall area records are larger than those of other areas’, and they are smaller during long period, so influences of hanging wall effect should be considered during short period of NPPs’ aseismic design spectra. Aiming at the inconsistent of probability level existing the current aseismic design spectra of China, based on characteristics of response spectra of hanging wall/footwall records, an improved Guo-Wang method was proposed. The new aseismic design spectra built here were compared with those of GB 50267—1997 of China and AP 1000 of USA. Results indicated that the hanging wall/footwall effect has significant influences on spectral values during short period of design spectra to increase spectral values, but it has no obvious influences on spectral values during medium and long period of design spectra.

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nuclear power plant / aseismic design spectrum / Guo-Wang method / hanging wall/footwall ground motion

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HU Jinjun, ZHANG Yanjing, XIE Lili. Effects of hanging wall/footwall ground motion on aseismic design spectra of China nuclear power plants[J]. Journal of Vibration and Shock, 2020, 39(19): 26-31

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