Level-crossing analysis of long-crested, Gaussian waves in space and time are studied in the context of wave loads on a fixed, horizontal deck-box above mean waterline. Vertical wave loads on decks due to insufficient airgap are a major concern for many in-service platforms. Reliable estimation of magnitude and duration of these loads is important in assessing structural and global response of an offshore platform. In the case of an irregular wave-impact on a flat deck of dimensions comparable to mean wavelength of the incident waves, both temporal and spatial variability of wave-kinematics need to be considered during the deck-wetting process. In the present study, we have used a multidimensional Gaussian formulation of incident wave-kinematics to derive a joint probability density function of deck-wetting (or exceedance) duration and its spatial extent. We have also derived a probability density function for initial slam force on deck. A numerical scheme for simulating wave-impact events on a two-dimensional deck is discussed, results from which are compared against corresponding analytical estimates. Vertical force on deck was estimated using the momentum method, which includes a von Kármán slamming model applied over the wetted-length determined from an undisturbed wave profile.
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e-mail: ravi.kota@ntnu.no
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November 2010
Offshore Technology
Gaussian Analysis of an Irregular Wave Impact on Deck
Ravikiran S. Kota,
Ravikiran S. Kota
Centre for Ships and Ocean Structures (CeSOS),
e-mail: ravi.kota@ntnu.no
Norwegian University of Science and Technology (NTNU)
, NO-7491 Trondheim, Norway
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Torgeir Moan
Torgeir Moan
Centre for Ships and Ocean Structures (CeSOS),
Norwegian University of Science and Technology (NTNU)
, NO-7491 Trondheim, Norway
Search for other works by this author on:
Ravikiran S. Kota
Centre for Ships and Ocean Structures (CeSOS),
Norwegian University of Science and Technology (NTNU)
, NO-7491 Trondheim, Norwaye-mail: ravi.kota@ntnu.no
Torgeir Moan
Centre for Ships and Ocean Structures (CeSOS),
Norwegian University of Science and Technology (NTNU)
, NO-7491 Trondheim, NorwayJ. Offshore Mech. Arct. Eng. Nov 2010, 132(4): 041302 (12 pages)
Published Online: September 24, 2010
Article history
Received:
June 18, 2009
Revised:
October 29, 2009
Online:
September 24, 2010
Published:
September 24, 2010
Citation
Kota, R. S., and Moan, T. (September 24, 2010). "Gaussian Analysis of an Irregular Wave Impact on Deck." ASME. J. Offshore Mech. Arct. Eng. November 2010; 132(4): 041302. https://doi.org/10.1115/1.4001436
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