This paper deals with model updating of Rugeley Chimney, a 183m reinforced concrete flue gas stack at a coalfired power station. Since February 2007 this has been monitored due to safety concerns about vibration levels. A 42-tonne tuned mass damper (TMD) was installed to reduce response levels and the monitoring system was used to track the mode frequencies.A numerical model has been built and experimental observations have been used to identify the concrete properties and the foundation stiffness of the original chimney through a process of model updating. These updated parameters are used to compare with the actual situation of the chimney and to detect possible changes on the chimney characteristics (stiffness and density) in the present time, comparing with another numerical model with TMD mass and stiffness on the top of the chimney. The updating procedure uses a sensitivity matrix and comparison of the frequencies and mode shapes through MAC values.
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