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日本福岛严重核事故后,超设计基准事故日益受到关注,核电厂在发生超设计基准事故(或严重事故)后,最关键的是要确保安全壳的完整性。基于某核电厂安全壳结构,建立包含预应力钢束的混凝土安全壳结构三维有限元模型,施加内压荷载进行非线性有限元分析,根据假定的破坏准则,给出了安全壳的极限承载能力,并与美国桑迪亚国家实验室的试验比较,初步分析了超压作用下安全壳整体结构及设备闸门局部区域的变形规律,安全壳超压破坏主要是由于设备闸门洞口附近的局部破坏所致。
Following the serious nuclear accident in Fukushima, Japan, there has been increasing concern over the ultra-design basis accidents. The most crucial point for nuclear power plants in ensuring the integrity of containment after an over-design-based accident (or serious accident) occurs. Based on the containment structure of a nuclear power plant, a three-dimensional finite element model of concrete containment structure containing prestressed steel strands is established and subjected to nonlinear finite element analysis by applying internal pressure load. According to the assumed failure criterion, the ultimate bearing capacity of containment is given , And compared with the test of Sandia National Laboratories in the United States, the deformation regularities of the overall structure of the containment and the local area of the equipment gate under overpressure were analyzed. The overpressure damage of the containment was mainly caused by the local damage near the gate of the equipment To