不中断运营的既有桥梁模态参数识别  

Structural modal parameter identification without interrupting operation of in-service bridge

作　　者：常军[1] 顾坚[2] 孟浩[1] 

机构地区：[1]苏州科技学院土木工程学院,江苏苏州215011 [2]苏州科技学院科技处,江苏苏州215011

出　　处：《广西大学学报（自然科学版）》2010年第1期131-135,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：江苏省自然科学基金资助项目(BK2007549);建设部研究开发项目(2008-K2-35)

摘　　要：为了在不中断桥梁运营的前提下使结构模态参数识别结果更精确,采用随机子空间方法对汽车荷载和环境激励共同作用下的不中断运营的桥梁结构进行模态参数识别研究,并采用一三跨连续梁的有限元模型进行了验证。结果表明,随机子空间方法可以识别汽车、环境共同作用下的桥梁结构模态参数识别,可以有效地识别环境激励下的不中断运营的桥梁结构的模态参数,拓展了随机子空间方法适用范围。Structural modal parameter identification under ambient excitation gradually becomes a hot point of study for the academic and engineer circles. In order to gain more accurate modal parameters of bridge without interrupting bridge operation, the paper presents a research on in-service bridge modal parameter identification by stochastic subspace identification under the suppose that vehicle loads are component of the ambient excitation. A finite element model is used to verify this suppose. The results show that stochastic subspace identification can identify the bridge modal parameters under vehicle loads and ambient excitation. The method proposed will not interrupt the bridge operation and expend the usage scope of stochastic subspace identification.

关 键 词：桥梁结构 随机子空间 环境激励 汽车荷载 不中断运营 参数识别 

分 类 号：U441[建筑科学—桥梁与隧道工程]