多层隔震框架多自由度体系的解耦动力分析
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摘要
根据隔震结构的特，点提出解耦假定，建立了振动系统分解法，将多层隔震框架的串联多质点振动体系分解为结构与基底限位阻尼器组成的弹塑性刚体滑移振动和上部结构体系内部的弹性相对振动两个系统．针对相对坐标系下的弹塑性滑移振动运动方程，用Ｗｉｌｓｏｎ－θ法构造了系统分解法直接动力分析新算法．通过输入不同地震波显示，使用系统分解法求得的上部结构动力反应与普通直接动力分析法结果相差不大，但却可将隔震器设计阶段的弹塑性动力分析简化为单自由度体系．
Decoupling hypothesis are put forward according to the features of base--isolatedstructures and a vibration system decomposition method is established to decompose the vibration system into two parts, one being elastic relative vibration within the superstructureand the other being elasto-plastic slide vibration of the whole structure over the base isolator. Based on the vibration equation with elasto--plastic slip in the relative coordinate systemand using Wilson-9 method, a new algorithm is developed for direct dynamic analysis by vibration system decomposing. It is shown by inputing different earthquake waves that there isnot so much difference in the dynamic respdnse so obtained when compared with ordinary direct dynamic method, while the adopted system decomposition method can make it possibleto convert the elasto-plastic dynamic analysis in the base--isolator design stage into an analysis in SDOF system.
Decoupling hypothesis are put forward according to the features of base--isolatedstructures and a vibration system decomposition method is established to decompose the vibration system into two parts, one being elastic relative vibration within the superstructureand the other being elasto-plastic slide vibration of the whole structure over the base isolator. Based on the vibration equation with elasto--plastic slip in the relative coordinate systemand using Wilson-9 method, a new algorithm is developed for direct dynamic analysis by vibration system decomposing. It is shown by inputing different earthquake waves that there isnot so much difference in the dynamic respdnse so obtained when compared with ordinary direct dynamic method, while the adopted system decomposition method can make it possibleto convert the elasto-plastic dynamic analysis in the base--isolator design stage into an analysis in SDOF system.
引文
1李立．建筑物的滑动隔震．隔震技术的研究与应用．北京；地震出版社，1991．60～692唐家祥，刘再华．建筑结构基础隔震．武汉：华中理工大学出版社，1993．117～1213郭继武．建筑抗震设计．北京：高等教育出版社，1990．143～1454包世华．高层建筑结构计算．北京：高等教育出版社，1991．182～183
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