【摘要】 针对土-结构动力相互作用振动台模型试验中有限地基土域的模拟问题,本文分别采用有限元法和边界元法对地基土模型的侧向人工边界和底部人工边界的合理位置问题进行了计算分析。文中首先采用三维有限元方法,探讨了地基土侧向垂直人工边界不同位置对群桩基础和箱形基础地震反应的影响,提出了侧向人工边界合理位置的具体建议;然后利用层土动力Green函数建立边界元模型,通过对埋入式条形基础的动力反应分析,探讨了底部水平人工边界的合理位置,提出了相应的建议。更多还原

【Abstract】 In this paper, the lateral bound and bottom bound of soil domain in shaking table model test of soil-structure interaction system were quantitatively analyzed. The dynamic response of pile foundation and box foundation under seismic loads were first calculated by 3-D finite element method. The influence of artificial lateral boundary on the seismic response of the soil-structure interaction system was investigated, and the advisable lateral positions were suggested. Then, the dynamic Green function for layered media was used to established the boundary element model, which is adopted to study the dynamic behavior of buried strip foundation, and the advisable positions of bottom boundary are also suggested.更多还原