Wave Impact on a Deck or Baffle
Some coastal or ocean structures have deck-like baffles or horizontal platforms that can be exposed to wave action in heavy seas. A similar situation may occur in partially-filled tanks with horizontal baffles that become engulfed by sloshing waves. This can result in dangerous wave impact loads (...
| Main Authors: | , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/8481/ http://umpir.ump.edu.my/id/eprint/8481/ http://umpir.ump.edu.my/id/eprint/8481/1/Wave_Impact_on_a_Deck_or_Baffle.pdf |
| Summary: | Some coastal or ocean structures have deck-like baffles or horizontal platforms that can be exposed to
wave action in heavy seas. A similar situation may occur in partially-filled tanks with horizontal baffles that become
engulfed by sloshing waves. This can result in dangerous wave impact loads (slamming) causing a rapid rise of
pressures which may lead to local damaging by crack initiation and/or propagation. We consider the wave impact
against the whole of underside of horizontal deck (or baffle) projecting from a seawall (or vertical tank wall),
previously studied by Wood and Peregrine (1996) using a different method based on conformal mappings. The
approach used is to simplify the highly time-dependent and very nonlinear problem by considering the time integral
of the pressure over the duration of the impact pressure-impulse, ܲሺݔǡ ݕሻ. Our method expresses this in terms of
eigenfunctions that satisfy the boundary conditions apart from that on the impact region and the matching of the two
regions (under the platform and under the free surface); this results in a matrix equation to be solved numerically. As
in Wood and Peregrine, we found that the pressure impulse on the deck increases when the length of deck increases,
there is a strong pressure gradient beneath the deck near the seaward edge and the maximum pressure impulse occurs
at the landward end of the impact zone. |
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