基底隔震对核电站反应堆厂房的地震响应影响分析

Influence Analysis on Seismic Response of Reactor Building of NPP Affected by Base-seismic Isolation

以某核电站反应堆厂房为研究对象,运用有限元分析软件ANSYS对比分析了极限安全地震动作用下采用基底隔震技术和不采用隔震技术厂房结构的地震响应。结果表明,采用基底隔震后能有效地减小反应堆厂房的水平向楼层反应谱、加速度响应及地震作用;采用基底隔震后厂房整体水平向的位移较大,位移主要集中在筏板基础处的隔震层,厂房结构本身楼层间的相对位移很小,呈现出类似刚体位移的特征;此基底隔震方案在水平向的隔震效果显著,而在竖直向隔震效果不明显。

Taking the reactor building of NPP as an example, comparison analysis of seismic responses was carried out with and without base-seismic isolation technology by the finite element analysis software ANSYS. The results show that the floor response spectrum, acceleration response and seismic action of the reactor building in the horizon- tal direction can be effectively reduced after the application of base-seismic isolation. The overall displacement of reactor building in the horizontal direction is larger and mainly concentrated in raft foundation of the isolation while the relative displacement between the floors is very small, and the reactor building shows the characteristics simi- lar to the rigid body displacement after the application of base-seismic isolation. This base-seismic isolation has a significant effect on the seismic response in the horizontal direction while the effect is not obvious in the vertical direction.