Nonlinear Model-Based System Identification of Lead–Rubber Bearings
Publication: Journal of Structural Engineering
Volume 134, Issue 2
Abstract
A nonlinear model-based system identification method is proposed, formulated, implemented, and applied to a three-span continuous base-isolated bridge. Transverse and rotational rigid-body motions of the bridge superstructure are formulated into two degrees-of-freedom dynamic governing equations. To model hysteretic behavior of lead–rubber bearings, the Menegotto–Pinto model is used. The proposed system identification procedures consist of two phases to address ill-conditioning issues. The uncertainty of parameters is considered, which results in probability distributions instead of single values for identified parameters. The proposed system identification is adopted in the comparison of experimental data sets. Hypothesis testing is used to determine the closeness of identification results. The proposed method is applied to quick-release field experiments on the bridge to investigate aging and temperature dependent effects in lead–rubber bearings.
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Acknowledgments
Financial support is gratefully acknowledged from the Multidisciplinary Center for Earthquake Engineering Research under FHwA Contract No. UNSPECIFIEDDTFH-61-92-C-00106 on Seismic Vulnerability of Existing Highway Construction. NYSDOT made available the bridge and facilitated site access and field coordination, including providing traffic control during many of the field tests. Field work and logistics provided by numerous former graduate students and departmental technicians are gratefully acknowledged, in particular that of Dr. Daniel Wendichansky, Dr. Gökhan Pekcan, and Mr. Mark Pitman. Collaboration on various aspects of the project with Dr. John Mander is also gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 2 • February 2008
Pages: 318 - 328
Copyright
© 2008 ASCE.
History
Received: Oct 10, 2005
Accepted: Mar 9, 2007
Published online: Feb 1, 2008
Published in print: Feb 2008
Notes
Note. Associate Editor: Vinay Kumar Gupta
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