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目的:以广东台山欧洲压水堆(EPR)核电站安全壳钢衬里结构为研究背景,提炼钢衬里结构模块化施工全过程中的关键力学问题,对钢衬里结构模块化施工技术从力学角度给出建议,对确定结构施工方案和保证结构施工安全具有实用参考价值。创新点:1.提炼出EPR核电站安全壳钢衬里结构模块化施工全过程中的关键力学问题;2.采用“重叠单元和生死单元”技术模拟大型复杂结构混凝土浇筑成型全过程。方法:1.通过精细化有限元分析,开展吊装工装结构优化分析、吊耳节点多尺度有限元分析和工作风速分析;2.建立安全壳结构复杂实体有限元模型,分析模块之间对接拼装初内力、新浇筑混凝土侧压力、不均匀温度作用及风荷载等施工因素对筒体钢衬里的影响;3.采用“重叠单元和生死单元”技术,分析大跨度穹顶钢衬里结构在混凝土浇筑成型全过程中的结构变形和应力;4.考虑结构初始几何缺陷和材料弹塑性的影响,对混凝土浇筑成型过程中穹顶钢衬里结构进行稳定性分析。结论:1.采用三角形环形桁架吊装工装,能够满足吊装过程的应力和变形要求,并减少吊装工装用钢量;2.获得了筒体钢衬里模块高度和混凝土一次浇筑最大高度的相关曲线;3.得到了混凝土浇筑成型全过程中穹顶钢衬里结构的力学性能;4.定义并验算了混凝土浇筑成型过程中穹顶钢衬里结构两个关键阶段的稳定性,为此类结构施工提供了理论参考。
OBJECTIVE: To study the key mechanical problems in the entire process of modularized construction of steel lining in the case of the steel liner of the containment of the European pressurized water reactor (EPR) plant in Taishan, Guangdong Province. The mechanical construction of the modular design of the steel lining is given from the mechanical point of view The suggestions are of practical and reference value for determining the structural construction scheme and ensuring the construction safety of the structure. Innovative points: 1. Refined the key mechanical problems in the entire process of modularized construction of steel liner of containment of EPR nuclear power station; 2. Simulated the whole process of concrete pouring of large and complex structures by using “overlap unit, life and death unit” technology. Methods: 1. Through the optimization of finite element analysis, the optimization analysis of the hoisting tooling structure, multi-scale finite element analysis of the lug node and the analysis of working wind speed were carried out.2. The finite element model of the containment structure complex entity was established, Internal force, newly poured concrete side pressure, uneven temperature effect and wind load on the cylinder liner; 3. Using “overlap unit and life and death unit” technology, analysis of long-span dome lining structure in the concrete pouring The deformation and stress in the whole process of forming are analyzed.4. Considering the influence of the initial geometric defects of the structure and the elasto-plasticity of the material, the stability analysis of the dome structure of the dome in the process of pouring of concrete is carried out. Triangle ring truss hoisting tooling can meet the lifting process of stress and deformation requirements, and reduce the amount of hoisting tooling steel; 2 get the tube steel lining module height and concrete pouring maximum height of the correlation curve; 3 The mechanical properties of the dome-shaped steel lining structure in the whole process of concrete pouring were obtained.4. The stability of two key stages of the dome lining structure in concrete pouring process was defined and verified, which provided a theoretical reference for the construction of this kind of structure.