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叠层钢板橡胶支座基础隔震建筑的隔震层位移过大时会导致橡胶支座失稳，本文对此提出了在隔震层增设缓冲限位保护装置做为第二道防线的设计方案，建立了考虑土—结构相互作用的结构分析模型，推导了不发生软碰撞、右侧软碰撞过程、左侧软碰撞过程的运动方程，编写了分析程序ＢＩＲＢＦＯＲ。通过工程实例分析，讨论了工程设计中如何选取缓冲限位保护装置适宜参数的方法。另外，通过对隔震体系考虑与不考虑土—结构平动相互作用的分析比较，发现在一般工程设计中可采用后者代替前者以简化计算。
When the displacement of the seismic isolation layer of the laminated steel plate base isolation building is too large, it will lead to the instability of the rubber bearing. This paper proposes a design proposal to add a buffer limit protection device as the second line of defense in the isolation layer. A structural analysis model considering the soil-structure interaction was established, and the equations of motion for the soft collision, right soft collision process, and left soft collision process were deduced, and an analysis program BIRBFOR was prepared. Through the analysis of engineering examples, the method of how to choose the suitable parameters of the buffer limit protection device in engineering design is discussed. In addition, through the analysis and comparison of the seismic isolation system considerations and the interactions without considering the soil-structure interaction, it is found that the latter can be used instead of the former to simplify the calculation in general engineering design.