0
RESEARCH PAPERS

Analytical Models for Mooring Chain-Soil Interaction

[+] Author and Article Information
K. Larsen

STATOIL Research Centre, Trondheim 7005, Norway

G. Svano̸

SINTEF Geotechnical Engineering, Trondheim, Norway

J. Offshore Mech. Arct. Eng 121(1), 1-8 (Feb 01, 1999) (8 pages) doi:10.1115/1.2829550 History: Received April 24, 1998; Revised September 11, 1998; Online December 17, 2007

Abstract

For most catenary mooring systems, a quite long part of the line is resting on the bottom, even in extreme situations. Hence, a good design of the anchor requires an accurate prediction of the loading from the anchorline, including any soil-chain interaction. This requires that the longitudinal chain-soil characteristics are well described for different soil conditions and that efficient computational models exist. This is particularly important in fatigue design of e.g., suction anchors. Design against fatigue is in many cases critical for these type of anchors. A problem is the lack of design tools handling the soil-chain interaction correctly. Traditionally, the soil effects are neglected completely in a fatigue design process. A consequence in many cases is an expensive overdesign. There exist chain-soil models to be applied together with FEM programs. These are too impractical to use in efficient fatigue design which requires the load assessment due to many seastates. They also suffer from the lack of reliable soil parameters. The paper addresses analytical models of the tension and longitudinal displacement along the part of the line resting on the bottom, assuming the tension at “touch-down” to be known. Hence, only longitudinal chain-soil interaction is considered. The models are based on recently established soil parameters for longitudinal chain-soil interaction. Comparison with FEM computations shows that the analytical models are performing very well in the prediction of cyclic loads. They are therefore a major improvement to the existing design procedures for anchor design.

Copyright © 1999 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In