Results from a Full-Scale Study on the Condition Assessment of Pendulum Tuned Mass Dampers
Publication: Journal of Structural Engineering
Volume 142, Issue 1
Abstract
Pendulum tuned mass dampers (PTMDs) are one of the most popular vibration control devices in use today for flexible towers, bridges, and buildings. Their most attractive feature is the design simplicity; the natural period can be controlled simply by adjusting the suspended length and viscous dampers can be easily integrated into the design. While this simplicity has resulted in their widespread adoption, the installed performance of PTMDs has not been investigated in much detail. This paper presents a methodology for conducting condition assessment of in-service PTMDs. Results from a full-scale study of a PTMD-equipped structure is used as a test bed to demonstrate the approach. The condition of an in-service PTMD is assessed using two criteria: the frequency and damping tuning ratios, and equivalent damping provided by the PTMD. These criteria are estimated while the PTMD is in service, without arresting the PTMD motion, using an extended Kalman filter. Practical considerations typical in full-scale structures arising from model reduction, measurements at limited degrees of freedom, and limited modes of interest are addressed in this assessment framework.
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Acknowledgments
The authors would like to thank Trevor Haskett, RWDI, for valuable discussions regarding the design of PTMDs in general, and the one studied here in particular. Support provided by the funding partners, Natural Sciences Engineering Research Council of Canada (NSERC) and the Greater Toronto Airports Authority (GTAA), is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 1 • January 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jun 27, 2014
Accepted: Apr 10, 2015
Published online: Jul 6, 2015
Discussion open until: Dec 6, 2015
Published in print: Jan 1, 2016
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