INFLUENCE OF UNCERTAINTY OF ROCK PROPERTIES ON SEISMIC RESPONSES OF REACTOR BUILDINGS

The influence of the dispersion and uncertainty of the dynamic shear wave velocity and Poisson＇s ratio of soil in a hard rock site was investigated on the seismic response of reactor building structure. The analysis is performed by considering the soil-structure interaction effects and based on the model of the reactor building in a typical pressurized water reactor nuclear power plant （NPP）. The numerical results show that for the typical floor selected, while the relative increment ratio of the dynamic shear wave velocity varies from -30% to 30% compared to the basis of 1 930 m/s, the relative variation of the horizontal response spectra peak value lies in the scope of ±10% for the internal structure, and the relative variation of the frequency corresponding to the spectra peak is 0.0% in most cases. The relative variation of the vertical response spectra peak value lies in the scope of - 10% to 22%, and the relative variation of the frequency corresponding to the Spectra peak lies in the scope of - 22% to 4%. The analysis indicates that the dynamic shear wave velocity and the Poisson＇s ratio of the rock would affect the seismic response of structure and the soil-structure interaction effects should be considered in seismic analysis and design of NPP even for a hard rock site.

分散的影响和不确定性动态砍波浪速度和泊松“在一个硬岩石地点的土壤的 s 比率在反应堆造的地震反应上被调查结构。分析被认为土壤结构是相互作用效果并且基于在一个典型的密封的水反应堆核电厂(NPP ) 造的反应堆的模型执行。数字结果为选择的典型地板显示出那，当时相对增长比率动态砍波浪速度变化从-30%到30%与 1 930 m/s 的基础相比，在为内部结构的 +-10 百分比的范围的水平反应系列山峰价值谎言的相对变化，和相应于系列山峰的频率的相对变化在大多数情况中是0.0%。在到 22% 的 -10 百分比的范围的垂直反应系列山峰价值谎言的相对变化，和相应于系列山峰的频率的相对变化躺在 -22percent 的范围到 4% 。分析显示动态砍波浪速度和泊松“岩石的 sratio 将影响结构和效果应该甚至为一个硬岩石地点在 NPP 的地震分析和设计被考虑的土壤结构相互作用的地震反应。