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核电作为清洁型能源具有广阔的发展前景,研究核电站的地震响应具有重要意义。建立了AP1000核岛的有限元模型,进行模态分析获取核岛的振动形态。用无限元模拟远场地基,有限元模拟近场地基,并考虑基础埋置及土与结构相互作用,开展了不同地基条件下的核岛地震响应分析。结果表明:随着地基刚度的增加,核岛节点的响应加速度幅值增大,而加速度反应谱峰值对应的周期减小,核岛节点应力增大,但其相对位移减小;考虑土与结构相互作用之后,软弱地基的响应加速度峰值大幅减小,地基加速度反应谱峰值对应的周期增加,土与结构相互作用对此类地基上核岛的地震输入有较大影响;对于坚硬岩石地基,土与结构相互作用对地震输入的影响可以忽略。
As a clean energy source, nuclear power has broad prospects for development and it is of great significance to study the seismic response of nuclear power plants. The finite element model of AP1000 nuclear island was established, and modal analysis was performed to obtain the vibration morphology of nuclear island. The far-field foundation is simulated by the finite element method, the near-field foundation is simulated by the finite element method, and the seismic response of the nuclear island under different ground conditions is analyzed considering the basic embedding and the interaction between soil and structure. The results show that with the increase of the foundation stiffness, the amplitude of response acceleration of nuclear island nodes increases, while the peak corresponding to acceleration response spectrum decreases. The stress of nuclear island nodes increases, but the relative displacement decreases. Considering the relationship between soil and structure After the interaction, the response acceleration peak of the soft foundation decreases greatly, the period corresponding to the peak of the acceleration response spectrum of the foundation increases, and the interaction between soil and structure has a great influence on the seismic input of the nuclear island on such foundation. For the hard rock foundation, The effect of structural interaction on seismic input can be neglected.