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针对核电工程的新型核岛结构CAP1400,建立屏蔽厂房和辅助厂房结构的整体有限元模型,进行模态分析获取了核岛结构的振动模态.进一步采用有限元模拟非基岩场地,考虑岩土与结构相互作用,针对不同的地震动情况开展不同剪切波速岩土场地上核岛结构的地震反应分析.研究表明:非基岩场地使核岛结构基础处的实际地震动输入有显著的改变,随着场地岩土剪切波速的增加,核岛结构基础处反应的加速度和应力增大,而位移及加速度反应谱峰值所对应的周期值减小.建议核岛结构抗震设计中非基岩场地导致的土-结相互作用影响应予以考虑,但当场地岩土剪切波速值大于1 250m/s时,其影响可以忽略.
Aiming at the new nuclear island structure CAP1400 of nuclear power project, the overall finite element model of shield building and auxiliary plant structure is established, and the modal analysis is performed to get the vibration mode of nuclear island structure.Using finite element method to simulate non-foundation rock site, And the interaction between structure and structure, the seismic response analysis of the nuclear island structure with different shear wave velocities is carried out according to the different ground motions. The results show that the non-bedrock field significantly changes the actual ground motion input of the nuclear island structure , The acceleration and stress of the nuclear island structure foundation increase with the increase of rock-soil shear wave velocity, while the period values corresponding to the peaks of displacement and acceleration response spectrum decrease.It is suggested that the non-bedrock The soil-node interaction caused by the site should be considered. However, when the shear wave velocity of the site is more than 1 250m / s, its influence can be neglected.