为了探究远场和近场地震动作用对核电隔震结构的不同影响, 研究了核电隔震结构在远场和近场地震动作用下的摇摆响应和支座状态, 主要讨论了地震特性对结构摇摆响应的影响, 包括上部结构的摇摆角、隔震支座的拉压应力、隔震支座的剪切变形等. 分析发现: 上部结构的摇摆角随地震动加速度幅值线性增加, 其中近场地震动作用下上部结构的摇摆角明显大于远场地震动作用, 且具有更大的离散性; 当地震动加速度幅值为 1.2 g 时, 近场地震动作用下上部结构摇摆角均值和标准差可达远场地震动作用下的 2.88 倍和 3.90 倍; 近场地震动作用下, 支座更容易进入非安定变形状态, 也更容易出现支座受拉现象. 该成果可为核电厂结构的隔震设计提供工程参考价值.

This paper explored the various effects of far and near field earthquakes by investigating the rocking response and bearing states of nuclear power isolation structures under both far and near field vibrations. The influence of seismic characteristics on the structural swing response was discussed, including the swing angle of the superstructure, tension and compression stresses, and shear displacement of the isolation bearings. The swing angle of the superstructure increased linearly with an increase in the acceleration amplitude. Moreover, the swing angle of the superstructure caused by near field vibration was larger than that caused by far field vibration, with greater discreteness. When the acceleration amplitude was 1.2 g, the mean and standard difference of the swing angle of the superstructure caused by near field vibration could reach 2.88 times and 3.90 times those caused by far field vibration, respectively. Near field vibrations were more likely to cause the bearing to enter a state of unsteady deformation, and appear to be in a state of tension. This paper provided engineering reference values for the seismic isolation design of nuclear power structures.