娄  宇  程  辉  施  昌
    （中国电子工程设计院  北京 100840）

[提要]  结合三个算例的分析，给出了大底盘上多塔楼高层建筑在某一方向振动时，既存在各个塔楼连同底部裙房一起的同方向振动，又存在每个塔楼之间相对振动的结构振动特点，归纳了大底盘上多塔楼高层建筑结构抗震分析时，计算振型数的选取方法和选取原则。
[关键词]  高层建筑  大底盘  多塔楼  自振特性  抗震分析

Through three calculating examples, the structure vibrational property of multi-tower structure with enlarged base is presented. The vibrating on certain direction is not only every tower with enlarged base on the same direction, hut is also in the opposite direCtion among every tower. The principle and method of choosing vibration mode number in aseismlc analysis for this type of high-rise building structures are concluded.
Keywords:  high-rise building; enlarged base; multi-tower; vibrational property; aseismic analysis