基于人工透射边界的核电厂结构抗震分析
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摘要
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 seismic safety analysis of nuclear power structures only use some simple numerical models recommended by various specifications, or the basic finite element model with viscous-elastic boundary, and there is no relatively high precision analysis method. A high precision multi-transmission formula model with artificial boundary on the basis of the implicit-explicit coupling integral method is introduced in this paper, and a directly numerical algorithm scheme on the framework of ANSYS is proposed, which particularly is applicable for the dynamic interaction analysis of complex factory building structures of nuclear engineering. And then, the validation and applicability of this new method is verified using a practical example. Numerical results proof that the proposed model is applicable for the finite element analysis of the dynamic response of nuclear power plant buildings
At present, the seismic safety analysis of nuclear power structures only use some simple numerical models recommended by various specifications, or the basic finite element model with viscous-elastic boundary, and there is no relatively high precision analysis method. A high precision multi-transmission formula model with artificial boundary on the basis of the implicit-explicit coupling integral method is introduced in this paper, and a directly numerical algorithm scheme on the framework of ANSYS is proposed, which particularly is applicable for the dynamic interaction analysis of complex factory building structures of nuclear engineering. And then, the validation and applicability of this new method is verified using a practical example. Numerical results proof that the proposed model is applicable for the finite element analysis of the dynamic response of nuclear power plant buildings
引文
[1]李建波,陈健云,林皋.无限地基-结构动力相互作用分析的分区递归时域算法研究[J].工程力学.2005,25(03).45-49.
[2]廖振鹏.工程波动理论导引[M].北京:科学出版社.1996.
[3]谢志南.透射边界零频飘移失稳数值解增长模式解释[J].地震工程与工程振动,2014,35(04).73-78.
[4]朱秀云.核电厂房地基抗震适应性及楼层谱不确定性分析[D].大连理工大学.2009.
[2]廖振鹏.工程波动理论导引[M].北京:科学出版社.1996.
[3]谢志南.透射边界零频飘移失稳数值解增长模式解释[J].地震工程与工程振动,2014,35(04).73-78.
[4]朱秀云.核电厂房地基抗震适应性及楼层谱不确定性分析[D].大连理工大学.2009.