首页 | 本学科首页   官方微博 | 高级检索  
     检索      

桥梁结构气动导纳识别的随机子空间方法
引用本文:秦仙蓉,顾明.桥梁结构气动导纳识别的随机子空间方法[J].同济大学学报(自然科学版),2004,32(4):421-425.
作者姓名:秦仙蓉  顾明
作者单位:同济大学,土木工程防灾国家重点实验室,上海,200092
基金项目:国家自然科学基金资助项目(59725818),教育部高等学校骨干教师资助计划项目
摘    要:气动导纳是反映脉动风速谱与抖振力谱之间传递特性的一个重要函数,其精度直接影响着桥梁设计过程中对结构抖振响应估计的精度.首次提出的采用基于输出协方差估计的随机子空间方法来识别桥梁结构气动导纳,将风洞试验简化为一步性的工作,解除结构阻尼对识别精度的制约,降低风洞试验的难度和成本,缩短试验周期.通过对江阴长江公路大桥的气动导纳识别的实践,表明提出的方法可以成功地得到满足工程精度的气动导纳函数,且简单易行.

关 键 词:桥梁结构  气动导纳  模态参数识别  随机子空间方法  风致振动
文章编号:0253-374X(2004)04-0421-05

Determination of Aerodynamic Admittance Functions of Bridge Decks by Covariance-driven Stochastic Subspace Identification Technique
QIN Xian-rong,GU Ming.Determination of Aerodynamic Admittance Functions of Bridge Decks by Covariance-driven Stochastic Subspace Identification Technique[J].Journal of Tongji University(Natural Science),2004,32(4):421-425.
Authors:QIN Xian-rong  GU Ming
Abstract:Aerodynamic admittance functions describe the transfer behavior between wind spectra and the spectra of the buffeting forces,which directly determine the precision of the predicted buffeting responses for bridge designs.The covariance-driven stochastic subspace identification is proposed in this paper to determine the aerodynamic admittance functions,which can reduce the corresponding wind tunnel test to one step,and release the restraint of the damping to the precision of identified aerodynamic admittance functions.The determination of aerodynamic admittance functions of the Jiangyin bridge reveals that the proposed technique can conveniently determine the aerodynamic admittance with the demanded precision.
Keywords:bridge structure  aerodynamic admittance  modal parameter identification  stochastic subspace identification  wind-induced vibration
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号