Structural Health Monitoring Based on Automated Operational Modal Analysis: Application to an Arch Bridge

This book chapter presents a strategy to perform the processing of data collected by dynamic monitoring systems in continuous operation, having in mind the evaluation of the structure health. This is based on the use of recently developed algorithms that are able to automatically perform the identification of the structure modal parameters from acceleration time series collected while the structure is in normal operation. From the analysis of the time evolution of natural frequencies associated with relevant modes, it is possible to perceive abnormal changes that might be associated with the appearance of structural damage. As it will be demonstrated throughout the chapter, this is only possible if adequate statistical tools are adopted to minimize the effects of environmental and operational factors, such as the ambient temperature or the traffic intensity over a bridge, on the experimentally identified modal parameters.

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