核电厂安全壳土‐结构相互作用地震反应简化分析方法
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摘要
核电厂安全壳的土‐结构相互作用分析中,地基土体的简化是非常重要的。为了与采用已有的基于MSC.Marc二次开发的土体静力和地震非线性分析方法得到的有限元结果进行对比,验证地基土体简化的适用性,在对土‐结构相互作用体系进行简化时,选用国内某已建成的第三代核电站安全壳作为土‐结构体系的上部结构,并采用文献中给出的集中质量法对其进行简化。为模拟下部结构地基土体提出两大类简化模型:第一类模型是参考《动力机器基础设计规范》(GB50040─96)给出的,称为"动力规范"简化模型;第二类模型,是将地基土体分为多层,称为层层简化模型。采用所提出的两类简化模型得到的简化方法对该安全壳算例的地基土体进行简化,并将其土‐结构相互作用地震反应分析结果与有限元法分析的结果做比较,结果表明通过在地基质量、土体模型自由度、抗剪刚度等方面进行逐步改进的层层简化法是可靠的。该简化法可作为一种合理实用的核电厂安全壳土‐结构相互作用简化分析方法,用于安全壳土‐结构相互作用的初步分析。
In the soil-structure interaction analysis of inner containment in nuclear power plant, it's very important to simplify piles and foundation soil. In order to compare with the finite element results of the static and earthquake non-linear analysis methods of soils based on MSC.Marc redevelopment, and to verify the applicability of the simplified foundation soil, an inner containment structure of the third generation nuclear power plant is selected as the upper structure in the simplification of soil-structure interaction system, which the containment is simplified by the concentrated mass method. For simulating the foundation soil, two types of models are proposed. In the first type of models, the foundation soil is simplified by referring "Code for design of dynamic machine foundation(GB50040-96)". In the other type of models, the foundation soil is simplified into multi layers which is called multi-layer simplified model. By using the simplified methods considering SSI obtained by the two types of models, the inner containment is analyzed, whose results are compared with those of finite element method. It is shown that with the foundation soil simplified by the multi-layer simplified model, the analysis results of the seismic response analysis considering SSI of the inner containment are reliable, in which the foundation mass, freedom of soil model and shear stiffness are revised.
引文
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