埋置效应对核岛结构地震反应的影响研究

Research on embedded effect to the seismic response of nuclear island

在二代核电站和三代核电厂的设计中,为了获得较好的抗震性能和稳定性,核岛结构的一部分埋置在地面以下,即核岛存在一定的埋置效应。对于这种埋置结构的抗震分析,一般常用不埋置假定来定义模型的边界条件。本文的主要目的是研究考虑埋置效应对于抗震分析结果的影响。通过对比分析核岛埋置模型和不埋置模型的地震反应可以发现:考虑埋置效应会明显降低结构的反应,不考虑埋置效应偏于安全。

In order to obtain good seismic performance, usually the nuclear islands are partly embedded under ground. Embedded effects exist in nuclear island structure. When doing seismic analysis of this embedded structure, the model is always assumed without embedment. To make a research of this embedded effect to the seismic response of nuclear island, a series of models are developed. According to the comparison results, the seismic response of embedded model is lower than surface model.