中文摘要：

国家现行的建筑抗震设计规范涵盖了抗震、隔震和消震3种防御地震作用的技术方法，其中采用隔震技术适用于以剪切变形为主且高宽比不大于4的建筑。建筑隔震设计依赖于地震反应谱法和时程分析法，设计分析过程相对比较繁琐。针对在地基简谐运动激励下的多自由度体系，文章采用复数法建立结构动力响应幅频关系的解析解，并由此进行参数分析来考察基底隔震层参数的变化对上部结构层间位移分布特性的影响规律，并对隔震参数选择提出了一个简化分析方法。分析结果对深刻认识基底隔震建筑的动力特性和隔震设计具有一定的参考价值。

英文摘要：

Three seismic techniques of anti-seismic design, seismic isolation and energy dissipation are included in the current seismic design code of China. Among them, the seismic base-isolation technology is suitable for shear-type buildings with a height-width ratio less than about 4. Both time history analysis method and response spectrum method are relatively complex for seismic isolation design in current seismic design code. In this paper, the dynamic response of multi-degree-of-freedom（MDOF） systems under base harmonic excitations is analyzed by using the complex number algorithm and the parameters analysis is made to study the effect of the change of the parameters of base isolation layer on the distribution characteristic of storey drift of superstructure. A simplified calculation method of base-isolation system parameters is presented based on the parameters analysis. The results of this paper are rather useful for deeply understanding the dynamic characters of seismic base-isolation buildings and have a reference value for seismic isolation design.