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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Experimental study of uplift pressures on wharf decks due to tsunami bores
Experimental study of uplift pressures on wharf decks due to tsunami bores
Author : C. CHEN(1) & B.W. MELVILLE(2)
ABSTRACT
Tsunamis are extreme waves that can result from the sudden displacement of a significant volume of ocean water.
Coastal buildings, bridges, highways, and harbor facilities that are at risk of tsunami inundation may suffer from
significant damage if their structure has not been adequately designed for the fluid loading. This paper explores the
behaviour of a combination structural model of a wharf deck mounted on a sloping shore and subjected to tsunami
bores. The tsunami bores were generated in a tsunami wave flume and the deck model was built on a 30 degree sloping
shore with a height of 25 cm above the bed. Detailed measurements of bore heights and bore velocities were recorded
with depth transducers and high-speed video camera, and seven cases of hydrodynamic conditions were applied in the
experiment. Pressure transducers were attached to the soffit of the deck to capture the spatial distribution of time-history
of uplift pressures. Preliminary results demonstrate that the time-history of uplift pressures have three stages: impulsive,
run-up, and quasi-steady. The impulsive pressures gradually reduced from the deck-slope connection to the front edge
of the deck, and the impulsive pressures and run-up pressures appeared to be decreased by a side effect. Higher
tsunami bores were generally found to generate higher uplift pressures, and a strong linear correlation was observed
between the maximum uplift pressure and the bore height. An equation is presented for estimating deck mid-point
maximum uplift pressures from bore heights, when the model bore heights range from 0.146~0.273m. Examples of
applying the equation at prototype scales are given.
File Size : 1,907,971 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 18/08/2015
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