Influences of base isolation system on seismic resistance of nuclear power plant containment
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摘要: 为了确保核电站在遭受破坏性的地震后，安全壳要保持密封性且不被破坏，基于地震波在结构中的传播规律，从隔震技术的原理出发，建立较为准确的三维安全壳有限元模型，运用定性的方法对核电厂安全壳进行数值模拟，对比了极限安全地震动作用下采取隔震技术和不采取隔震技术安全壳的动力响应。采取隔震措施的安全壳的顶点在x、y、z方向的最大加速度分别为2.85、12.84和3.05m/s2，相比于无隔震措施的安全壳，加速度分别降低了79.52%、27.56%和79.47%。结果表明，隔震技术能有效地减小核电站安全壳的地震反应。Abstract: The study explored how to keep the reinforced concrete containment sealed and undamaged for the nuclear power plant subjected to a severe earthquake during the plant life.The propagation of seismic waves along the structure was analyzed.And based on the structural isolation technology, a three-dimensional finite element model was developed for the reinforced concrete containment.The application of the isolation technology to the reinforced concrete containment was discussed by applying a deterministic methodological approach.For the nuclear power plant subjected to a safe shutdown earthquake, the dynamic response of the reinforced concrete containment with isolators was compared with that of one without isolators.The accelerations at the dome vertex of the isolated containment along the x, yand z axes are about 2.85m/s2, 3.05m/s2 and 12.84m/s2, respectively, which are 79.52%, 79.47%and 27.56%, respectively, lower compared with the isolated containment.So the isolation system is helpful for mitigating the seismic response of the nuclear power plant containment.
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图 3 采用隔震支座后安全壳整体位移和加速度
Figure 3. Acceleration and displament of containment with isolator scheme
图 8 安全壳顶点相对位移响应时程曲线
Figure 8. Histories of relative displacement at containment dome vertex
图 9 安全壳底板楼层特征位置加速度响应谱
Figure 9. Response spectra at base floor reference point for isolated and not isolated containment
表 1 隔震和不隔震安全壳的的振动模态
Table 1. Vibration mode of containment
模态 fi/Hz T/s 无隔震 有隔震 无隔震 有隔震 1 4.375 3 0.363 4 0.228 6 2.752 2 2 4.395 4 0.402 4 0.227 5 2.484 9 3 6.249 8 0.402 4 0.160 0 2.484 9 4 6.252 8 4.283 4 0.159 9 0.233 5 5 7.139 1 4.287 6 0.140 1 0.233 2 
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