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《Journal of Fuzhou University(Natural Sciences Edtion)》 2001-06
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Comparison of system identification methods using ambient vibration measurements

REN Wei-xin (Department of Civil Engineering and Architectures, Fuzhou University, Fuzhou, Fujian 350002, China)  
The paper is intended to compare system identification techniques for evaluating the dynamic characteristics of civil engineering structures from ambient vibration data. Two system identification techniques used are the frequency domain based peak picking (PP) method and the time domain based stochastic subspace identification (SSI) method. A 15 storey reinforced concrete shear core building and a steel girder arch bridge have been chosen as case verification. The results demonstrate that the PP method is simple and fast. However, the damping ratio and mode shapes are not guaranteed. The computational load of the SSI technique is significantly higher than the PP method, but the quality of the identification is also higher. The SSI technique with the help of stabilization diagram can detect closely spaced frequencies that are possibly missed with the PP method and provides a more reasonable modal shape in most cases. For real applications, it is suggested that the PP method could be used on site to verify the quality of the measurements and to have a quick look at the overall dynamic behaviour of the structure. Afterwards the advanced SSI technique can be applied to detail or to ensure the results.
【CateGory Index】: TU311.3
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