Separation and extraction of bridge dynamic strain data

Wu, Baijian, Li, Zhaoxia, Wang, Ying, & Chan, Tommy H.T. (2008) Separation and extraction of bridge dynamic strain data. Journal of Southeast University (Natural Science Edition), 38(5), pp. 767-773.


Through comparing the measured data of dynamic strains due to loading and temperature by the strain gauge and temperature sensor at the same location, the information in the strain data was divided into three parts in the frequency domain by using the defined index named PSD (power spectra density)- ratio. The three parts are dominated respectively by temperature varying, stresses and noises and can be distinguished from the determined values of the separatirix frequencies. Then a simple algorithm was developed to separate the three types of information, and to extract the strain caused mainly by structural stresses. As an application of the proposed method, the influence of strain deformation and noises. As an application of the proposed method, the influence of strain deformation and noises on the fatigue assessment was investigated based on the separated data. The results show that, the determined values of separatrix frequencies are valuable for the monitoring data from other bridges. The algorithm is a multi resolution and hierarchical method, which has been validated as a simple and effective method for data analyses, and is suitable for the compression and pre-processing of the great amount monitoring data and easy to be integrated in the SHM's (structural health monitoring)software system. The strain due to temperature varying attributes only a little to the errors of fatigue assessment. However, the noises or random disturbance existed in the monitoring data have much responsibility for the errors, the main reason is that the random disturbance shifts the real strain/stress amplitude picked up by real structural stress or strain.

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ID Code: 18954
Item Type: Journal Article
Refereed: Yes
Keywords: Structural Health Monitoring, Structural Strain, Information separation, infromation extraction, fatigure assessment
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2008 please consult the authors
Deposited On: 25 Mar 2009 04:07
Last Modified: 10 Aug 2011 18:26

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