The decision principle of mode number is: when the error of base shear and top displacement are both below 5%, the sum of modal participating mass ratio should exceed 90%;

研究结果表明：高层建筑结构抗震设计中高振型的影响不容忽视，在底部剪力和顶端位移误差小于5%的情况下，累计质量参与系数应大于90%；

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The decision principle of mode number is: when the error of base shear and top displacement are both below 5%, the sum of modal participating mass ratio should exceed 90%;

研究结果表明：高层建筑结构抗震设计中高振型的影响不容忽视，在底部剪力和顶端位移误差小于5%的情况下，累计质量参与系数应大于90%；

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