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    張  吳    （武漢市建筑設(shè)計(jì)院430014）

[提要]  結(jié)合工程計(jì)算實(shí)例，指出非對(duì)稱高層建筑存在著平移和扭轉(zhuǎn)振動(dòng)，應(yīng)采用coc法進(jìn)行振型組合。大底盤上非對(duì)稱多塔樓在振動(dòng)中存在相對(duì)獨(dú)立性，當(dāng)塔樓之間的剛度和質(zhì)量分布相差較大時(shí)，振型與對(duì)稱多塔樓結(jié)構(gòu)存在著顯著差別，對(duì)每棟塔樓均應(yīng)選取足夠的振型數(shù)，并提出了一種選取適當(dāng)振型數(shù)的判定方法。
[關(guān)鍵詞]  反應(yīng)譜分析法  耦合系數(shù)  非對(duì)稱多塔樓  自振特性  振動(dòng)的相對(duì)獨(dú)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