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土的动力计算模型及其参数的确定是土-结构动力相互作用分析的一个重要内容。利用有限元方法建立场地自由场和土-结构相互作用分析模型,分别采用线弹性模型、等效线性模型和Drucker-Prager理想弹塑性模拟地基土,探讨了不同强度地震动作用下Drucker-Prager模型的适用性问题,分析了不同土介质模型对土-结构相互作用体系地震反应的影响。结果表明,在场地非线性地震反应分析中,只有当输入加速度峰值在80~100 gal时,Drucker-Prager模型与等效线性模型计算结果是接近的,考虑土-结构相互作用后,两种模型计算所得的承台加速度和结构顶层加速度误差分别在8%和10%左右。因此,工程应用中应关注土介质模型的选用。
Soil dynamic calculation model and its parameters are the important contents of soil-structure dynamic interaction analysis. The finite element method is used to establish the field free-field and soil-structure interaction analysis model. The linear elastic model, equivalent linear model and Drucker-Prager ideal elastoplastic model are used to simulate the subsoil. The Drucker-Prager model The applicability of different soil models to the seismic response of soil-structure interaction system is analyzed. The results show that the Drucker-Prager model and the equivalent linear model are close to each other only when the input acceleration peak is between 80 and 100 gal in the nonlinear seismic response analysis of the site. After considering the soil-structure interaction, the two models The calculated capacceleration and top structure acceleration are about 8% and 10% respectively. Therefore, engineering application should pay attention to the choice of soil model.