Abstract The seismic study of the spent fuel storage rack (SFSR) is of great significance for ensuring the safety of spent fuel. But it is a challenging topic for the complex nonlinear behaviors such as fluid–structure interaction (FSI), friction and impact. At present, owing to the lack of the understanding of these nonlinear behaviors, in engineering design process, the seismic analysis of SFSRs is usually conducted with a conservative method. To reduce the excessive margin in the seismic design of CAP1400 (a new reactor type developed by China) rack, we have performed a 1/10 scale shaking table experimental study in the previous work. As an extension of the previous study, a series of 3/10 reduced-scale seismic experiments considering the effect of FSI were carried out to study the scale effects in this paper. The experiments obtained friction coefficient between the rack and the tank (spent fuel pool model), the maximum sliding displacement of the rack and the fluid pressure distribution of the tank wall. Furthermore, the seismic responses of the rack under different experimental variables such as the number of racks, experimental scales and vertical excitation were derived. The results showed that the relative uncertainty of the sliding displacement response is very large. Moreover, the large sliding displacement differences between single-rack case and double-rack case indicated that fluid–structure interaction has a strong influence on sliding of rack. We adopted a generally used similarity criterion for seismic experiment of rack, and the experimental results showed the scaling analysis of fluid pressure satisfies the similarity relationship, however, the displacement results were influenced greatly by scale effect. These results can be the benchmarks for the seismic analysis of CAP1400 spent fuel storage rack under dynamic seismic loading.

中文翻译：

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考虑流固耦合影响的3/10缩比CAP1400乏燃料储存架振动台试验

摘要 乏燃料储存架（SFSR）的地震研究对于保障乏燃料安全具有重要意义。但对于复杂的非线性行为，例如流固耦合 (FSI)、摩擦和冲击，这是一个具有挑战性的课题。目前，由于对这些非线性行为缺乏认识，在工程设计过程中，SFSR的抗震分析通常采用保守的方法。为减少CAP1400（我国研制的新型反应堆型）机架抗震设计中的余量，我们在前期工作中进行了1/10规模的振动台试验研究。作为前人研究的延伸，本文进行了一系列考虑 FSI 效应的 3/10 缩尺地震实验来研究尺度效应。实验得到了机架与罐体的摩擦系数（乏燃料池模型）、机架的最大滑动位移和罐壁流体压力分布。此外，推导出了机架在不同实验变量（如机架数量、实验尺度和垂直激励）下的地震响应。结果表明，滑动位移响应的相对不确定度很大。此外，单齿条箱和双齿条箱之间较大的滑动位移差异表明流固耦合对齿条滑动有很大影响。我们采用通用的相似准则进行机架抗震实验，实验结果表明流体压力的标度分析满足相似关系，然而，位移结果受尺度效应的影响很大。这些结果可为CAP1400乏燃料储存架在动态地震载荷下的抗震分析提供基准。