Study on Shaking Table Test of Nuclear Structure Considering SSI Effect and Isolation
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摘要: 土-结构相互作用(SSI)对结构地震响应有明显的影响。为研究SSI效应对核电结构的影响,选取第三代核反应堆AP1000安全壳结构为研究对象,制作了1/40的安全壳模型进行振动台试验,采用柔性土箱消除边界效应。试验结果表明:1)对于核电非隔震结构,考虑SSI会降低系统自振频率,上部结构加速度反应谱高频成分减少,峰值频率从高频向低频移动,土体表现出一定的隔震效果,降低了某些频率处的加速度谱响应;2)对于核电隔震结构,考虑SSI几乎不对自振频率产生影响,但SSI效应会削弱隔震效果以及会加大某些频率处的加速度响应。Abstract: Soil-structure interaction (SSI) has obvious influence on structural seismic response. To study the effect of SSI on nuclear, taking the third-generation reactor AP1000 containment structure as the object, a 1/40 scale model was fabricated for the shaking table test, and a flexible soil container was applied to simulate the unlimited site and eliminate the boundary effect as far as possible. The results indicate that: 1) for the non-isolated NPP structure, considering SSI will reduce the natural frequency of the model. Meanwhile, the effect makes the high-frequency component of the acceleration decrease, and the peak frequency moves from high frequency to low frequency. Therefore, the soil shows a certain isolation effect and reduces the acceleration of the containment structure; 2) for isolated NPP structure, considering SSI has almost no effect on the natural frequency, but SSI effect will weaken the isolation effect and increase the acceleration value at some frequencies.
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