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《Journal of Experimental Mechanics》 2006-04
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Ambient Vibration Tests and Analysis of a Large Span CableStayed Bridge

REN Wei-xin1,LIN You-qing2,PENG Xue-lin2(1.Central South University,Changsha,Hunan 410075,China;2.Fuzhou University,Fuzhou,Fujian 350002,China)  
Bridge ambient vibration test has an advantage of being simple,fast and cheap.A full ambient vibration test of the newly constructed Qingzhou cable-stayed bridge was carried out just prior to the opening of the bridge.The dynamic properties were identified by using the peak picking of the average normalized power spectral densities in frequency-domain and stochastic subspace identification in time-domain.The experimental results agree well with those obtained from three-dimensional finite element modal analysis.It is demonstrated that the ambient vibration tests are sufficient to identify the most significant modes below 1.0 Hz for this kind of large span cable-stayed bridges. The identified dynamic properties can be served as the basis in the finite element model updating,damage detection,condition assessment and health monitoring of the bridge.
【Fund】: 国家自然科学基金资助项目(50378021)
【CateGory Index】: U446.1
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