阻尼特性对超高层混合结构的振动响应分析

摘要

Uses finite element software Etabs to carry out dynamic analysis for the super high-rise hybrid structure, uses damping ratio of each order vibration mode got by calculation method of complex damping presented by professor Huang ben-cai, and adopts other types of damping ratio as different calculating conditions when constructs the damping matrix, compares the influence of damping on the dynamic response of super high-rise hybrid structure based on damping ratio calculated by the method presented by professor Huang ben-cai. The results show that structural vibration response changes about 20%even if the damping ratio differs about 1%, and the change reaches 40%when the damping ratio differs about 2%for the same super high-rise composite structure.%混合结构体系由于自身的复杂性和特殊性，到目前为止结构的等效阻尼比尚未有较为科学、有效、普遍认可的取值方法或者计算方法。针对超高层混合结构，应用Etabs有限元软件对其进行动力分析，在构建阻尼矩阵时，通过采用黄本才教授的复阻尼计算方法所得的各阶振型阻尼比以及分别采取其他各种阻尼比值作为不同的计算工况，以黄本才教授的复阻尼计算方法所得的各阶振型阻尼比为准，对比分析出阻尼特性对超高层混合结构的动力响应影响，结果表明对同一超高层混合结构，即使阻尼比相差约1%时，也会引起结构体系振动响应相对误差20%左右的变化，相差约2%时，更是达到了40%的变化。