环境随机振动频域法全桥气弹模型模态识别  

Modal Identification of Full Bridge Aeroelastic Model with Frequency-Domain Approach of Ambient Random Vibration

作　　者：朱乐东[1] 李超[1] 郭震山[1] 

机构地区：[1]同济大学,上海200092

出　　处：《结构工程师》2005年第6期38-42,共5页Structural Engineers

摘　　要：提出了用一个人工低风速的紊流场作为主要环境随机振动源的环境随机振动试验方法,并用该试验方法和随机振动信号频域分析方法对南京长江三桥全桥气弹模型进行了模态识别。经与有限元计算结果比较后可知,所识别的全桥气弹模型固有频率和振型结果令人满意。An ambient random vibration testing approach with an artificial turbulent wind field of lowerspeed is proposed in this paper. The modal parameters of the full bridge aerodynamic model of the 3rd Nanjing Bridge over Yangtze River are then identified using this testing approach in conjunction with frequency -domain approach for random signal analysis. The identified natural frequencies and mode shapes are found satisfying via a comparison with those obtained by finite element computation.

关 键 词：全桥气弹模型 环境随机振动 频域法 模态识别 随机振动信号 气弹模型 全桥 环境 频域分析方法 试验方法 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]