基于不中断交通运行模态分析的模态挠度法在桥梁状态评估中的应用  

Application of modal deflection method in condition assessment of a bridge based on operational modal analysis without interrupting traffic

作　　者：林贤坤[1,2] 覃柏英[1] 张令弥[2] 郭勤涛[2] 

机构地区：[1]广西科技大学,柳州545006 [2]南京航空航天大学,南京210016

出　　处：《振动与冲击》2013年第14期52-57,76,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50575101);广西自然科学基金资助项目(2012GXNSFAA053208);江苏省交通科学研究计划项目(06Y20);广西教育厅科研项目(200103YB105);博士科研基金资助项目(院科博1005)

摘　　要：以张家港河大桥为对象,在不中断交通条件下对该桥实施模态试验,建立和修正其有限元模型,由此对试验模态振型质量归一化。利用振型已质量归一化的试验模态参数,计算该桥已知静荷载作用下的试验模态挠度,通过模态挠度与静挠度实测值的比较、关键问题的仿真研究和模态振型对模态挠度影响的误差分析,探讨和说明了基于不中断交通运行模态分析的模态挠度法在实际工程中应用于桥梁状态评估的可行性与有效性。Zhangjiagang bridge was taken as a studying object,its finite element model was built and updated based on the results of traffic excitation modal test without interrupting traffic,and it was applied to obtain the massnormalized test modal shapes.Using the natural frequencies and the mass-normalized modal shapes,the test modal deflection values of the bridge under given loads were calculated.Through the comparison between the test modal deflection values and the measured values of static deflection,simulation study of some key issues and error analysis for the effect of modal shape on modal deflection,the feasibility and effectiveness of applying the modal deflection method based on operational modal analysis（OMA） without interrupting traffic in condition assessment of a bridge were explored and presented.

关 键 词：桥梁状态评估 模态挠度法 不中断交通 运行模态分析 试验模态振型 质量归一化 

分 类 号：U447[建筑科学—桥梁与隧道工程]