石墨堆芯结构在地震激励下动态响应的数值模拟

Numerical Analysis for HTR-PM Graphite Core Structure Dynamic Response under Seismic Load

模块化高温气冷堆(HTR-PM)石墨堆芯结构是多体结构,其动态特性研究是复杂的非线性问题。国内外开展了一系列研究,未能较好解决。为了分析该非线性结构的动态特性,本文介绍一种数值模型,将石墨砖和碳砖简化为质点,各部件的接触简化为连接器单元,通过碰撞试验拟合获取连接器参数。数值模型计算的位移基本同1∶1双层四砖石墨组件试验位移时程结果吻合。分析证明,模型对参数不敏感,计算结果准确高效。因此,可将此模型用于石墨堆芯结构的位移分析。

High temperature reactor-modular pebble bed（HTR-PM）graphite core structure is recognized as multi-body structure that introduced complicated non-linear issues into the investigation of dynamic characters. Many attempts were made to research this issue,however,problems still remained.In this paper,a numerical analysis model was introduced,which simplified graphite/carbon bricks as mass point with rotary inertia and contacts of the components as connectors.The parameters of the connectors were obtained from relevant tests.Numerical analysis results match the tests displacement results of 1∶1four-brick-two-layer graphite assembly.Moreover,the numerical model is insensitive to parameters.Hence,this model can be applied in HTR-PM graphite core structure dynamic response under seismic loads with precision and lower calculation cost.