Department: Structural Engineering
Name: Hong Guan
Email: hguan @ ucsd.edu
Grad Year: 2006
Operational Modal Analysis (OMA) has been successfully implemented in some efforts to monitor the change in performance of highway bridges. Although seeing greater success, there are some pitfalls and limitations that need to be aware of. Recently, a long-term vibration-based structural health monitoring system has been implemented on a composite highway bridge in California. Using operational modal analysis, ambient excitation can be used to excite the structure and the structure can remain in its operational condition during the test. Several operational modal analysis technique has been successfully integrated with the system to give reliable estimation of modal parameters. Their comparative strength and weakness were discussed in this context. The modal parameters generated can then be used as input for damage detection algorithms using the Element Modal Strain Energy approach. The change of structural performance due to time-based deterioration and other irregularities can be monitored. The results are made available to the California Department of Transportation via a web-based interface, enabling appropriate action to be authorized for preliminary maintenance or emergency response prior to actual onsite inspection.
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