【摘要】 根据堆心的三维均匀化动力学模型，给出了分析堆心地震响应的基本方程和定解条件．采用有限元法进行离散，并应用Ｗｉｌｓｏｎ －θ直接积分法编制了数值计算软件，给出了一个数值算例．计算了在地震加速度激励下，堆心内流体压力和管梁挠度的响应曲线更多还原

【Abstract】 Nuclear reactor core is composed of a great number of tubular beams, which are immersed in a fluid with period structure. The fluid structure interaction is an important phenomenon influencing the dynamical response of bundle, and it’s very complex. Much effort has been made upon the development of a mathematical model capable of predicting the global behavior of the beam bundle. Based on the 3-D homogenization model, fundamental equations and boundary conditions are presented for the analysis of the core’s seismic response. Finite element method is employed for detailed analysis. Results of responses of the fluid pressure and the beam deflection under seismic excitation are presented.更多还原