Effects of Sea Surface Movement on Offshore Structures

by G. D. Hahn, (M.ASCE), Vanderbilt Univ, Nashville, United States,

Document Type: Proceeding Paper

Part of: Structures Congress XII


Examinations are made of the effects of the sea surface movement on the fundamental model response of deep-water, Wave-excited offshore structures. These effects are accounted for by using the linear wave theory in combination with the 'stretching' and the 'vertical extrapolation' models. The structural response is examined by the separating its static and dynamic components. It is shown that applications of the stretching model lead to the prediction of small sea-surface movement effects on the response that can be ignored. It is further shown that the main effect of the vertical extrapolation model is to increase the static response, particularly for drag-force dominated system. The influences of extrapolation on the dominated systems. The influences of extrapolation on the dynamic response of the structure are not particularly significant under conditions of practical importance. The results reported herein apply to offshore platforms operating in water depths in the approximate range of 300-900m.

Subject Headings: Offshore structures | Seas and oceans | Surface waves | Land subsidence | Structural models | Dynamic models | Mathematical models | Structural response

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