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目前核电厂结构-地基地震动力相互作用模型仍局限为规范建议的简单集总参数模型,或以粘弹性边界为代表的基本有限元地基模型,缺乏精度相对较高的分析方法。本文将高精度的二次透射人工边界地基模型引入核电结构抗震的分析领域,针对厂房结构的复杂约束,采用隐显式方法求解,显式积分时域结果后处理等关键问题,基于ANSYS软件提出了模型解决方案,并以实例形式验证了本文方法与模型的适用性。结果表明,文中模型适用于核电厂建筑物动力响应的有限元分析。
At present, the model of nuclear power plant structure-foundation seismic dynamic interaction is still limited to the simple lump parameter model proposed by the norms or the basic finite element foundation model represented by viscoelastic boundary, which lacks the analysis method with relatively high accuracy. In this paper, a high-precision secondary permeable artificial boundary foundation model is introduced into the seismic analysis of nuclear power structures. In view of the complex constraints of the plant structure, the key problems such as the implicit explicit method and the post-processing of explicit integral time-domain results are proposed. Based on the ANSYS software The solution of the model is given, and the applicability of the method and the model in this paper is validated by examples. The results show that the model is suitable for the finite element analysis of the dynamic response of a nuclear power plant.