Non-Gaussian Model for Ringing Phenomena in Offshore Structures
Publication: Journal of Engineering Mechanics
Volume 128, Issue 7
Abstract
Significant interest has been shown in identifying the nonlinear mechanisms that induce a ringing type response in offshore structural systems. This high frequency transient type response has been observed in offshore systems, particularly in tension leg platforms (TLPs). Given the implications of this behavior on the fatigue life of TLP tendons, it is essential that ringing be considered in the overall response evaluation. This study presents two non-Gaussian probabilistic models of nonlinear viscous hydrodynamic wave forces that induce ringing. The response of a single-degree-of-freedom system exposed to these non-Gaussian wave force models is then evaluated using analytical and numerical studies based on the Ito⁁ differentiation rule and the Monte Carlo simulation procedure, respectively. The results demonstrate that the proposed models induce ringing type response in a simplified structure. This study provides a probabilistic framework for modeling ringing type phenomenon which will serve as a building block for more refined hydrodynamic load models.
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Published In
Journal of Engineering Mechanics
Volume 128 • Issue 7 • July 2002
Pages: 730 - 741
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Jul 21, 2000
Accepted: Jan 2, 2002
Published online: Jun 14, 2002
Published in print: Jul 2002
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