本文将样条有限元法分析直接承受建筑物的桩基和土体,用半解析无限元法分析外围半无限土体,分析了相邻建筑物的相互作用.用这种耦合方法不仅具有输入数据少,计算工作量小,并且避免了人为有限边界的影响.最后运用模态综合法进行地震反应分析.数值计算表明,当两结构相邻较近时,单体结构与双体结构在自振特性,尤其位移、基底总剪力等方面均有差异. In this paper, the spline finite element method is directly applied to the pile foundation and soil of the building. The semi-analytical infinite element method is used to analyze the surrounding semi-infinite soil and the interaction between adjacent buildings is analyzed. This coupling method not only has the input The data is small, the computational workload is small, and the influence of artificially limited boundaries is avoided. Finally, the modal synthesis method is used to analyze the seismic response. Numerical calculations show that when the two structures are close to each other, the monomer structure and the double structure are The vibration characteristics, especially the displacement and the total shear of the substrate, are all different.