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有效模拟土一结构相互作用(SSI)和土体非线性特征是进行土质地基条件下核岛厂房结构地震响应分析的关键技术问题。基于SuperFLUSH软件平台,采用等效线性法描述近场地基非线性动力特征,通过在地基有限区域设置黏性人工边界来模拟半无限地基辐射阻尼效应的影响,并利用一维有限元法进行自由场响应分析实现地震动的输入,从而建立土质地基条件核岛厂房结构地震响应分析计算模型。最后,以某土质地基条件下的CPR1000堆型反应堆厂房的集中质量简化模型作为研究对象,开展考虑SSI效应和分层土质地基非线性对于核岛厂房结构地震响应特征影响研究,验证了该计算模型的精度和工程应用效果。研究表明:考虑SSI效应,可有效吸收散射波波动能量,减小结构响应;考虑土质地基非线性效应,加速度幅值在不同方向均有不同程度的降低,峰值频率明显的向低频偏移,因此,同时考虑SSI效应及土质地基的非线性特征,并将两者相结合的分析方法对核岛厂房结构抗震分析是必要的。
The effective simulation of soil-structure interaction (SSI) and soil nonlinear characteristics are the key technical issues in the seismic response analysis of the nuclear island building under the condition of soil-based foundation. Based on the SuperFLUSH software platform, the equivalent linear method is used to describe the nonlinear dynamic characteristics of the near-field foundation. The viscous artificial boundary is set up in the limited area of the foundation to simulate the influence of the semi-infinite foundation radiation damping effect. One-dimensional finite element method Response analysis to achieve the input of ground motion, so as to establish the soil foundation conditions of nuclear island plant structure seismic response analysis and calculation model. Finally, based on the simplified mass concentration model of a CPR1000 reactor plant under the condition of a soil foundation, the influence of the SSI effect and the nonlinearity of the layered soil foundation on the seismic response characteristics of the nuclear island plant structure is studied, and the calculation model The accuracy and engineering application results. The results show that considering the SSI effect, the energy of the scattering wave can be effectively absorbed and the structural response can be reduced. Considering the nonlinear effect of the soil foundation, the amplitude of the acceleration decreases in different directions and the peak frequency obviously shifts to the low frequency. , Considering both the SSI effect and the non-linear characteristics of the soil foundation, and the combination of the two methods is necessary for the seismic analysis of the nuclear island plant structure.