Hybrid Nonlinear Seismic Analysis of Bridges with Moving Traffic
Publication: Journal of Aerospace Engineering
Volume 33, Issue 1
Abstract
Owing to current limitations on seismic forecasting, there is a high chance that a considerable number of vehicles will remain on bridges when an earthquake occurs. In traditional seismic analyses, traffic loads were often ignored. Mode-based bridge–traffic interaction analysis usually cannot consider the nonlinearity effects of bridges under earthquakes, which are critical to short- and medium-span bridges. Traditional nonlinear seismic analyses using commercial or open-source software cannot directly incorporate complex dynamic interactions between moving vehicles and bridges. There is no reported methodology so far that can be used for nonlinear seismic analyses of typical short- and medium-span bridges while rationally considering the coupling effects between the bridge, moving vehicles, and an earthquake at the same time. A hybrid simulation approach is proposed to conduct nonlinear seismic analyses of bridge–traffic–earthquake systems by integrating stochastic traffic flow simulation, a mode-based fully coupled simulation technique of bridge–traffic systems, and a nonlinear seismic analysis platform developed based on OpenSees. A skewed and curved bridge, which is a design commonly used to overcome complex intersections and terrain restrictions for short- and medium-span bridges, is studied as a demonstration followed by the numerical investigation of the bridge’s seismic performance and the impact of incorporating traffic loads. The results suggest that the proposed hybrid methodology can capture complex dynamic interactions between bridges and multiple vehicles as well as nonlinear seismic performance to provide rational prediction results.
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Acknowledgments
This research is supported by Colorado State University and the Mountain-Plains Consortium, a university transportation center funded by the US Department of Transportation. The contents of this paper reflect the views of the authors, who are solely responsible for the facts and accuracy of the information presented.
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Published In
Journal of Aerospace Engineering
Volume 33 • Issue 1 • January 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Oct 31, 2018
Accepted: Aug 1, 2019
Published online: Sep 28, 2019
Published in print: Jan 1, 2020
Discussion open until: Feb 28, 2020
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