考虑地基不均匀性核电厂房结构拟三维抗震安全分析

Quasi-Three-Dimensional Seismic Safety Analysis of Nuclear Power Plant Considering Foundation Inhomogeneity

基于SUPERFLUSH/2D软件中地震响应分析理论,以大型通用有限元软件ANSYS为平台,结合其自身提供的二次开发工具的功能特性,进而将二维平面地震响应分析功能成功嵌入到ANSYS中。为了验证开发模型的准确性与可靠性,以非均质地基条件下的某核电站反应堆厂房结构为研究对象,研究了不均匀土质地基对考虑土-结构相互作用核反应堆地震响应的影响,通过ANSYS有限元软件建立了结构-地基整体系统模型。模型底部及两侧均可考虑无限地基能量传递边界,底部表达波动的能量传递;两侧表达波动的逸散。最后通过拟三维动力计算法得到了地基不均匀性对核电厂反应堆的楼层反应谱及典型位置位移峰值,从而为核反应堆厂房结构设计提供理论依据,方便于工程运用;通过与真三维计算结果对比分析验证了开发模型的准确性与可靠性。

Based on the theory of seismic response analysis in SUPERFLUSH/2 D from ANSYS, combined with the functional characteristics of the secondary development tools provided by itself, the two-dimensional plane seismic response analysis function was successfully embedded in ANSYS. In order to verify the accuracy and reliability of the development model, This paper took the reactor building structure of a nuclear power plant under the condition of heterogeneous foundation as the research object. The influence of heterogeneous soil foundation considering soil-structure interaction on the seismic response of nuclear reactor is analyzed. The structure-foundation integrated system model is modeled by ANSYS. The energy transfer boundary of infinite body can be considered at the bottom and both sides of the model, and the energy transfer of fluctuations can be expressed at the bottom and the dissipation of fluctuations can be expressed at both sides of the model. Finally, the peak displacement of typical position and floor response spectrum of nuclear power plant reactor is obtained by quasi-three-dimensional dynamic calculation method, which can provide theoretical basis for the structural design of nuclear power plant and is convenient for engineering application.