基础隔震建筑软碰撞保护分析

Analysis of Soft Collision Safety for Base Isolated Buildings

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ＢＩＲＢＦＯＲ。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。

In order to ensure the safety of base isolated buildings during extreme earthquakes, this paper provides a type of the protective device which consists of buffers installed in isolation layer as the second defence measure A structural analytic model is set up in consideration of soil structure interaction The motion equations of three states of non collision, right soft collision and left soft collision are deduced The program BIRB FOR,which may be used for not only linear dynamic analysis but also nonlinear dynamic analysis,is written in FORTRAN Language In the course of analysing practical engineering application, the way of choosing appropriate parameters for the protective device is discussed The comparisons of the two analytic models, whether or not in consideration of soil structure interaction, illustrate that the influence of the soil structure interaction does not need to be accounted for most ordinary buildings in engineering designs