【摘要】 对核电厂结构,考虑土-结构相互作用进行随机地震反应分析,着重探讨地基土特性的不确定对核 电厂结构楼层反应谱的影响．在运用ANSYS软件对核电厂结构进行有限元建模时,通过设置边界弹簧单元 和阻尼装置来考虑土-结构相互作用;并且通过设置不同的弹簧刚度和阻尼系数,来模拟土特性参数的不 确定性．数值仿真分析以及随机分析与确定分析的结果对比,揭示了土-结构相互作用对核电厂结构楼层 反应谱的影响规律以及核电厂结构楼层反应谱对地基土参数不确定的敏感性．由此可以得出结论,随机分 析方法能够很好地反映核电厂结构的楼层反应谱特征,且确定分析方法是随机分析方法的特解,从而为应 用概率方法和确定方法评估核电厂结构地震反应的参数敏感性提供了理论依据．更多还原

【Abstract】 A stochastic seismic response analysis for nuclear power plant structure is carried out considering soil - structure interaction, and the influence of uncertain soil properties on the floor response spectrum of the nuclear power plant structure is mainly investigated. When the finite element model of the nuclear power plant structure is built by the ANSYS software, the soil - structure interaction is considered through setting the boundary springs and dampers, and the uncertain soil properties are simulated through setting different parameters of stiffness of spring and damping of damper. The regularity of influence of the soil - structure interaction on the floor response spectrum of the nuclear power plant structure and the sensitivity of the floor response spectrum of the nuclear power plant structure on the uncertain soil properties are revealed through the numerical simulation and the comparison between the results by the stochastic and determined analyses. A conclusion is given that the characteristics of the floor response spectrum of the nuclear power plant structure may be explored by the stochastic analysis method, and the determined analysis method is the particular solution of the stochastic analysis method, which provides a reference for the evaluation of the parametric sensitivity of the floor response spectrum of the nuclear power plant structure using either probabilistic or determined method.更多还原