AP1000核岛结构基础隔震设计与参数影响分析

Seismic Isolation Design and Parameter Effect Analysis of AP1000 Nuclear Island Structure

基于ANSYS和Midas Gen软件建立AP1000核岛结构有限元模型,通过非线性时程分析方法模拟核岛结构的三维地震响应,对核岛结构在安全停堆地震作用下的响应规律及隔震控制进行研究。选取隔震周期、刚度比和屈重比为控制参数,分析不同隔震层参数对核岛结构地震响应的影响。研究表明:引入基础隔震技术,能有效降低核岛结构的地震响应;核岛结构随隔震周期的延长,顶点水平加速度和隔震层剪力均呈现明显减小趋势,屈重比和屈服前后刚度比随隔震周期的延长,对隔震核岛结构的地震响应影响越小。

The finite element model of AP1000 nuclear island structure was built by ANSYS and Midas Gen software platform, and its three-dimensional seismic response was analyzed through nonlinear time history method. The seismic response and seismic isolation control of the nuclear island structure under safe shutdown earthquake is investigated. In addition, the isolation period, stiffness ratio and flexion weight ratio is selected as the control parameters of the seismic isolation layer, to analyze the seismic isolation layer and superstructure seismic response with different seismic isolation layer parameters. The results show that, the base seismic isolation can significantly reduce the seismic response of the nuclear island structure. The superstructure top horizontal acceleration and shear of seismic isolation layer remarkably decreases with the increasing of the isolation period. Besides, the effect of flexion weight ratio and stiffness ratio on the seismic response of isolated nuclear island structure declines with the increasing of the isolation period.