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Characteristics of the Wave Loads on Coastal Low-Lying Twin-Deck Bridges

Topics: Critical Infrastructure Theory, Water/Wastewater,

This paper presents a set of numerical experiments on the characteristics of periodic wave loads on coastal low-lying twin-deck bridges. Such bridges along the US Gulf Coast have failed in the past during hurricanes because the design did not adequately account for hydrodynamic loads due to storm surge and water wave loading. The study finds that that wave loads differ between the two decks and that horizontal and vertical loads on the seaward deck vary as a function of the relative deck gap. The methodology can be used to determine the optimal deck gap for a given wave design condition.

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