结构动力分析中的阻尼模型研究  

Research on Structure Damping Model in Analysis of Dynamic Response

作　　者：王伟宏[1] 孟新田[1] 唐葭[1] 

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000

出　　处：《湖南城市学院学报（自然科学版）》2009年第2期13-16,共4页Journal of Hunan City University:Natural Science

摘　　要：阻尼是结构振动中的基本特性之一,是结构抗震分析中一个重要的因素.结构在不同振型的阻尼比会有所不同,这是因为在结构的阻尼耗能主要是摩擦耗能的情况下,摩擦耗能取决于楼层和楼层之间的相对位移,不同的振型所表达的楼层间的相对位移不一样,当然每个振型的阻尼比也会不一样,现行抗震规范把所有振型的阻尼比取为相同常数的做法不尽合理.探讨了在低幅值震动和强震中合理阻尼比的取值,通过其他各阶振型阻尼比与基本振型阻尼比的关系,提出了在结构动力时程分析中较为合适的瑞利阻尼模型以及推动阻尼研究需要解决的几个问题.Damping is one of the basic dynamic properties of structure in vibration ,it has considerable effects on structural dynamic response. Structure has different damping ratio in different vibration modal because structure damping energy dissipation is from the friction, and the friction energy magnitude is decided by vibration modal. It is unreasonable that all modal damping ratio is constant in current codes. This paper discussed the reasonable damping ratio in low amplitude vibration and strong vibration by the relationship of basic vibration modal and other modals, the Revised Rayleigh damping modal is presented, and the method of damping ratio calculation in complex damping structure is discussed. Finally, this paper presents several issues about damping research.

关 键 词：结构抗震 基本振型 阻尼耗能 结构动力时程分析 瑞利阻尼模型 

分 类 号：TU311.3[建筑科学—结构工程]