娄  宇  王红庆  陈义明
    （中国电子工程设计院 北京 100840）

[提要]  结合两个算例的分析，提出了大底盘上双塔楼高层建筑和大底盘上双塔连体高层建筑同一振型有两种振动表现形式的结构振动概念，探讨了这类高层建筑结构抗震分析时计算振型数的选取原则，对比了大底盘上双塔楼高层建筑和大底盘上双塔连体高层建筑的计算结果，给出了结构抗震设计中需注意的问题，最后提供了一些结论供设计参考。
[关键词]  高层建筑 大底盘 双塔楼 连体建筑  自振特性 抗震设计

Based on analyzing two example structures, a new concept that the same vibrational mode has two mode shapes in two-tower structure or two-tower structure linked by spatial corridors, both with enlarged base, is presented. The principle of choosing vibrational mode numbers in aseismlc analysis for this type of highrise building structures is discussed. Their calculating results are compared, and some questions in aseismic design are emphasised.ln the end, the useful results for structural aseismic design are given.
Keywords: high-rise building; enlarged base;  two-tower, spatial corridors; vibrational property; aseismic design