Coastal Structures and Solutions to Coastal Disasters Joint Conference 2015
Numerical Simulation of Hydrodynamic Interference Effects on Coastal Twin Bridge Decks under Hurricane Waves
Publication: Coastal Structures and Solutions to Coastal Disasters 2015: Tsunamis
ABSTRACT
The wave forces on the typical coastal twin bridge decks under Stokes 2nd order waves have been investigated using the Escambia Bay Bridge as the prototype one. The shear stress transport (SST) k-ω model is adopted as the turbulence closure for the RANS equations. Different still water depths with various structure elevations for prescribed gaps between the twin bridge decks (seaward bridge deck and landward bridge deck) are considered to represent different scenarios in field. Both the horizontal and vertical forces under the prescribed conditions are analyzed in details. The results show that at most times the wave forces on the landward bridge deck are relatively smaller than those on the seaward bridge deck. However, the comparisons of the wave forces between the single bridge deck and the twin bridge decks show that much larger wave forces (based on those on the single bridge deck) will be induced on the seaward bridge deck due to the hydrodynamic interference effects caused by the landward bridge deck. As such, it is extremely important to recalibrate the prediction equations proposed by the AASHTO code since these equations are based on the data acquired through the laboratory study regarding the wave forces on one single bridge model.
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ACKNOWLEDGEMENT
This work is supported by the Louisiana State University, under the Economic Development Assistantship for the first author and the NSF Grant CMMI-0927824. The work is also supported by HPC@LSU high performance computing resources. All the opinions presented here are those of the writers, not necessarily representing those of the sponsors.
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Published In
Coastal Structures and Solutions to Coastal Disasters 2015: Tsunamis
Pages: 87 - 97
Editors: Louise Wallendorf, U.S. Naval Academy and Daniel T. Cox, Ph.D., Oregon State University
ISBN (Online): 978-0-7844-8031-1
Copyright
© 2017 American Society of Civil Engineers.
History
Published online: Jul 11, 2017
Published in print: Jul 11, 2017
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