Experimental Study of the Hydrodynamic Responses of a Bridge Tower to Waves and Wave Currents
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143, Issue 3
Abstract
To understand the hydrodynamic responses of a bridge tower, which consists of a large round-ended caisson foundation and a diamond-type superstructure, a model experiment at a 1:150 scale was conducted in a laboratory flume. The model was designed to be an elastic structure, which would simulate the dynamic properties of a freestanding bridge tower. Regular waves and the combined action of waves and currents were used as loads in the experiment. The horizontal base shear forces of the foundation and the dynamic responses of displacement and acceleration on the superstructure were measured and analyzed. It is found that the wave current–induced base shear force is approximately equal to the sum of the corresponding wave-induced and current-induced base shear forces. The vibrations of the superstructure are irregular and consist of free vibration at a natural frequency and forced vibration at a wave frequency. The vibration responses driven by the wave currents are slightly larger than those driven by the waves alone, indicating that a forward current does not observably amplify the dynamic responses of the bridge tower.
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Acknowledgments
This work is supported by the Technology Programs of the Ministry of Transport of China (Grant 2011318494150) and the State Key Laboratory of Coastal and Offshore Engineering of the Dalian University of Technology (Grant SL2012-3).
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143 • Issue 3 • May 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Jun 16, 2016
Accepted: Oct 27, 2016
Published online: Jan 16, 2017
Published in print: May 1, 2017
Discussion open until: Jun 16, 2017
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