三维基底隔震反应堆厂房的隔震效果研究  

Study of Isolation Effectiveness of Nuclear Reactor Building with Three-dimensional Seismic Base Isolation

作　　者：朱秀云 李建波 潘蓉 孙锋 ZHU Xiuyun;LI Jianbo;PAN Rong;SUN Feng(Nuclear and Radiation Safety Center,Ministry of Ecology and Environment,Beijing 100082,China;Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]生态环境部核与辐射安全中心,北京100082 [2]大连理工大学建设工程学部,辽宁大连116024

出　　处：《原子能科学技术》2023年第2期438-448,共11页Atomic Energy Science and Technology

摘　　要：为了研究三维基底隔震技术在核电站中的应用,基于组合式碟形弹簧支座(CDSB)具有可根据其承载力和刚度需求灵活调整的优点,设计了4种不同组合形式的CDSB,分别与铅芯叠层橡胶支座串联组成4种不同竖向刚度的三维组合式隔震支座(3D-CIB),首次将其应用于反应堆厂房,隔离反应堆厂房筏基底部的水平向和竖向地震动输入,并对比研究不同竖向刚度的3D-CIB对其三维隔震效果的影响。结果表明:与非隔震结构相比,3D-CIB能够有效地减小水平向和竖向的楼层反应谱和加速度响应;3D-CIB的水平向隔震效果受竖向刚度的影响较小,3D-CIB的竖向刚度越小,其竖向隔震效果越好,但同时会相应增大反应堆厂房的水平向和竖向位移响应,其中包括摆动效应;引入摆动率的概念,定量分析了摆动效应,3D-CIB竖向刚度的降低会明显增大摆动效应,在设计中不容忽视,3D-CIB竖向刚度的设计应权衡其隔震效果与位移响应;此外,在地震过程中3D-CIB均处于受压状态,反应堆厂房不存在倾覆的风险。三维隔震效果研究为将来3D-CIB应用于工程实践提供了技术基础。In recent years, three-dimensional(3D) seismic base isolation system has been studied extensively. In order to study the application of 3D seismic base isolation in nuclear power plants(NPPs), the new 3D combined isolation bearing(3D-CIB) composed of laminated rubber bearing with lead-core coupled with combined disk spring bearing(CDSB) was proposed. Four different combinations of CDSB were designed and employed as the vertical isolation component, based on the advantage that the constitution of CDSB can be flexibly adjusted according to its bearing capacity and stiffness requirement. CDSB and laminated rubber bearing with lead-core were respectively connected in series to form four kinds of 3D-CIB with different vertical stiffnesses, which was firstly applied to isolate nuclear reactor building from both the horizontal and vertical components of seismic motion beneath the raft foundation. The influence of different vertical stiffnesses of 3D-CIB on the 3D isolation effectiveness was investigated. A comparative study of modal analysis in terms of main frequencies and mode shape, and the seismic response in terms of acceleration floor response spectra(FRS), acceleration and relative displacement response was carried out, respectively. The results show that the main frequencies of the 3D isolated nuclear reactor building for the degrees of freedom of both translation and torsion are significantly reduced compared with that of the non-isolated structure, and the first mode of the 3D isolated superstructure is not purely horizontal motion along the x-axis but a combination of rocking and horizontal motion. 3D-CIB can effectively reduce FRS and acceleration response in both the horizontal and vertical direction. Overall, the horizontal isolation effectiveness of 3D-CIB is less affected by vertical stiffness, and the smaller vertical stiffness of 3D-CIB, the better the vertical isolation effectiveness is, while the horizontal and vertical displacement response of superstructure increases correspondingly, including the

关 键 词：三维组合式隔震支座 三维隔震效果 地震响应 反应堆厂房 

分 类 号：TL48[核科学技术—核技术及应用]