张  吴    （武汉市建筑设计院430014）

[提要]  结合工程计算实例，指出非对称高层建筑存在着平移和扭转振动，应采用coc法进行振型组合。大底盘上非对称多塔楼在振动中存在相对独立性，当塔楼之间的刚度和质量分布相差较大时，振型与对称多塔楼结构存在着显著差别，对每栋塔楼均应选取足够的振型数，并提出了一种选取适当振型数的判定方法。
[关键词]  反应谱分析法  耦合系数  非对称多塔楼  自振特性  振动的相对独立性

The calculation result of 2 high residential buildings is presented.lt shows that for a non-mirrored building, the fundamental mode shape has x, y translation, as well as torsion components. As a method of model combination, CQC should be used. The vibration of non-mirrored multi-towers high building with enlarged base is independent at most time. When the distribution of each tower's mass and rigidity has a great difference, mode shapes differ greatly with that of a mirrored multi-tower high building, vibration mode number for each tower should be chosen adequately in aseismic analysis. Method of choosing a proper vibration mode number for this kind of structure is concluded.
Keywords: response spectrum analysis; cross-modal coefficient; non-mirrored multi-tower; vibration property