Ambient Vibration Tests and Analysis of a Large Span Cable-Stayed Bridge
大跨度斜拉桥环境振动试验与分析

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.