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http://dx.doi.org/10.12652/Ksce.2011.31.2A.089

Evaluation of Damping Properties on Suspension Bridge Using Extended Kalman Filter  

Park, Dong-Uk (부산대학교 대학원 사회환경시스템공학과)
Kim, Nam-Sik (부산대학교 공과대학 사회환경시스템공학부)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.31, no.2A, 2011 , pp. 89-96 More about this Journal
Abstract
The damping ratio as an index of bridge vibration could be considered as one of the important dynamic characteristics of a suspension bridge. But estimating of damping ratio on an existing suspension bridge under ambient vibration condition could be a laborious task. Moreover, it is not simple to directly distinguish aerodynamic damping and friction damping from apparent damping. According to previous studies, the aerodynamic damping properties can be linearly affected by wind speed level, and apparent damping ratio can be affected by amplitude of vibration. Therefore, in this article, the relationships among damping ratio, wind speed level and amplitude of acceleration were studied for separating extract aerodynamic damping and friction damping from apparent damping. Damping ratios on Sorok Bridge, a suspension bridge which is a located in Go-Heung, Korea, were estimated by two different methods as using Hilbert transform and extended Kalman filter which were well known as effective estimation methods for non-linear state. It was possible to distinguish aerodynamic damping and friction damping from apparent damping using averaged normal components of wind speed, RMQ values of acceleration, and estimated damping ratios from wind-induced vibration responses and vehicle loading responses.
Keywords
damping properties; suspension bridge; extended Kalman filter; aerodynamic damping; friction damping;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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