模态间气动耦合效应对桥梁抖振的影响(英文)  

Effect of Aerodynamic Coupling Among Modes on Buffeting Response of Bridges

作　　者：曾宪武[1] 韩大建[1] 

机构地区：[1]华南理工大学土木工程系,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2005年第4期53-58,共6页Journal of South China University of Technology(Natural Science Edition)

摘　　要：对桥梁抖振的分析传统上均采用单模态叠加SRSS法,但随着桥梁的长大化,模态间气动耦合效应的影响越来越大,在分析中必须加以考虑.有鉴于此,文中采用Scanlan多模态耦合抖振理论,以2自由度弯扭耦合系统为研究对象,通过定义系统的10种不同的传递函数并考察系统传递函数随风速的变化规律,对模态间气动耦合效应进行进一步的研究,揭示了模态间气动耦合的机理和本质.The buffeting analysis of bridges has traditionally been accomplished by the single-mode-based SRSS (Square Root of the Sum of the Squares) method. As the main spans of bridges become longer and longer, the effect of the aerodynamic coupling among modes becomes so significant that it should not be neglected any more. In this paper, ten transfer functions are defined to further investigate the effect of the aerodynamic coupling among modes by analyzing the variation of the transfer functions with wind velocity. This investigation is based on the multimode buffeting analysis procedure proposed by Scanlan. A torsional coupling system with 2 degrees of freedom is used as the object, and the characteristics and mechanism of the aerodynamic coupling are discussed.

关 键 词：大跨度桥梁 多模态耦合抖振 频域 气动耦合 传递函数 

分 类 号：U441[建筑科学—桥梁与隧道工程]