Assessment of Simplified Linear Dynamic Analysis of a Multispan Skew Bridge on Steel-Reinforced Elastomeric Bearings
Publication: Journal of Bridge Engineering
Volume 17, Issue 1
Abstract
The dynamic response of a three-span reinforced concrete deck on steel girder skew bridge supported by elastomeric bearings is investigated both experimentally and analytically. The case study presents modal parameter estimates obtained from a large-scale field deployment of accelerometers supported under a wireless sensor network. Through output-only system identification, the natural frequencies, damping ratios, and mode shapes are extracted for the first 20 structural poles. Linear dynamic analysis of the bridge through three-dimensional finite-element analysis is then performed to provide a comparison between the response estimate predicted under the minimum requirements of multimode spectral analysis dictated by the AASHTO design specifications and the in-service dynamic response. Linear elastic bearing stiffness in the compressive, shear, and flexural states is estimated using independent design specifications set forth by AASHTO and Standards Australia, and modeled with idealized fixity. The case study concludes that linear dynamic analysis provides a well-correlated, yet conservative estimate of multimodal displacement for bridges supported by steel-reinforced elastomeric bearings when bearing stiffness is defined by using either design specification.
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Acknowledgments
This research has been funded by the New York State Energy Research and Development Authority (NYSERDA) in collaboration with the New York State Department of Transportation (NYSDOT). The authors graciously acknowledge the assistance of the New York State Department of Transportation and, in particular, the Region 7 engineers and bridge maintenance crew for facilitating and assisting with the field testing. Additionally, the authors would like to recognize graduate students Michael Gangone and Dan Nyanjom for their assistance with sensor installation and logistics throughout the field deployment. Any opinions, findings, conclusions, or recommendations expressed in this paper are those of the authors and do not reflect the views of the agencies.
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Published In
Journal of Bridge Engineering
Volume 17 • Issue 1 • January 2012
Pages: 151 - 160
Copyright
© 2012 American Society of Civil Engineers.
History
Received: May 3, 2010
Accepted: Jan 4, 2011
Published online: Dec 15, 2011
Published in print: Jan 1, 2012
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