A three-dimensional nonlinear soil-structure interaction analysis is simulated in time domain in order to evaluate the behavior of a nuclear reactor building under different earthquake motions. The effects of earthquake frequency content and soil-structure interaction are taken into account by using three different ground motions and four different soil types. Viscous boundary and free-field column are used to absorb propagating waves and consider the free-field motion in the soil medium, respectively. Analysis of three cases are carried out: (i) linear analysis, (ii) nonlinear analysis with the bonded contact between superstructure and soil medium, and (iii) nonlinear analysis with the sliding contact between superstructure and soil medium. The results obtained from the time domain are validated by using a code in the frequency domain, and a good agreement is found between two methods. By changing the soil properties and ground motions, some comparisons of the nuclear reactor responses are made. It is concluded that both of soil-structure interaction and earthquake frequency content are highly sensitive to the behavior of nuclear reactor building under seismic loading. Also, this research leads to some new findings that are useful for practical applications while considering the soil-structure interaction and earthquake frequency content in nuclear structures.

在时域中模拟了三维非线性土-结构相互作用分析，以评估核反应堆建筑物在不同地震运动下的行为。通过使用三种不同的地面运动和四种不同的土壤类型，考虑了地震频率含量和土-结构相互作用的影响。粘性边界和自由场柱分别用于吸收传播的波并考虑土壤介质中的自由场运动。进行了三种情况的分析：（i）线性分析，（ii）上部结构与土壤介质之间的粘结接触的非线性分析，以及（iii）上部结构与土壤介质之间的滑动接触的非线性分析。通过使用频域中的代码来验证从时域获得的结果，并且在两种方法之间找到了很好的协议。通过改变土壤性质和地面运动，对核反应堆的响应进行了一些比较。结论是，土-结构相互作用和地震频率含量对地震作用下核反应堆建筑物的行为高度敏感。此外，这项研究还得出了一些新的发现，这些发现对于实际应用非常有用，同时考虑了土壤结构相互作用和核结构中的地震频率含量。结论是，土-结构相互作用和地震频率含量对地震作用下核反应堆建筑物的行为高度敏感。此外，这项研究还得出了一些新的发现，这些发现对于实际应用非常有用，同时考虑了土壤结构相互作用和核结构中的地震频率含量。结论是，土-结构相互作用和地震频率含量对地震作用下核反应堆建筑物的行为高度敏感。此外，这项研究还得出了一些新的发现，这些发现对于实际应用非常有用，同时考虑了土壤结构相互作用和核结构中的地震频率含量。