广东台山核电站内安全壳穹顶施工阶段受力性能及稳定性分析

发布时间：2018-04-27 20:45

本文选题：核电站安全壳 + 时变施工力学　；参考：《建筑结构学报》2014年01期

【摘要】：以广东台山核电站工程为研究背景,建立安全壳穹顶的复杂实体有限元分析模型,合理简化边界条件,以整体模型能量误差评估网格精度。该工程穹顶跨度近50 m、内衬6 mm厚的钢板。针对施工时变结构特点,考虑混凝土弹性模量随龄期变化的影响,采用重叠单元和生死单元技术,分析大跨度穹顶在混凝土浇筑成形整个施工过程中的结构变形和应力,并考虑初始几何缺陷和材料弹塑性的影响,分析施工关键阶段结构在新浇筑混凝土自质量及施工活荷载作用下的稳定承载力。结果表明:施工时变全过程分析结果与整体一次成型建模分析的结果差异显著,前者分析的结构最大挠度为3.2 mm,而后者分析的仅为1.2 mm;施工过程中结构稳定安全系数不小于3.4,满足要求。
[Abstract]:Based on the research background of Taishan Nuclear Power Plant Project in Guangdong Province, the finite element analysis model of complicated entity of containment dome is established, the boundary condition is reasonably simplified, and the grid accuracy is evaluated by the energy error of the whole model. The dome span of the project is nearly 50 m and the steel plate with a thickness of 6 mm is lined. In view of the characteristics of time-varying construction structure, considering the influence of the change of concrete elastic modulus with age, the structural deformation and stress of large-span dome during the whole construction process of concrete pouring are analyzed by using overlapping element and birth and death element technology. Considering the influence of initial geometric defects and elastoplasticity of materials, the stable bearing capacity of the structure in the key stage of construction under the action of self-quality of newly cast concrete and construction live load is analyzed. The results show that the results of time-varying whole process analysis are significantly different from those of integral modeling. The maximum deflection of the former is 3.2 mm, while that of the latter is only 1.2 mm, and the structural stability safety factor is not less than 3.4 mm in the construction process, which meets the requirements.
【作者单位】：中国建筑股份有限公司技术中心;中建二局核电建设分公司;
【分类号】：TU755;TU745.7

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