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Research Papers: Offshore Technology

Quasi-Static Analysis of the Multicomponent Mooring Line for Deeply Embedded Anchors

[+] Author and Article Information
Zhen Guo

Research Center of Coastal and Urban
Geotechnical Engineering,
College of Civil Engineering and Architecture,
Zhejiang University,
Hangzhou 310058, Zhejiang, China
e-mail: nehzoug@163.com

Lizhong Wang

Professor
Research Center of Coastal and Urban
Geotechnical Engineering,
College of Civil Engineering and Architecture,
Zhejiang University,
Hangzhou 310058, Zhejiang, China
e-mail: wlzzju@163.com

Feng Yuan

Research Center of Coastal and Urban
Geotechnical Engineering,
College of Civil Engineering and Architecture,
Zhejiang University,
Hangzhou 310058, Zhejiang, China
e-mail: yuanfen5742@163.com

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received November 6, 2011; final manuscript received November 5, 2015; published online December 10, 2015. Editor: Solomon Yim.

J. Offshore Mech. Arct. Eng 138(1), 011302 (Dec 10, 2015) (9 pages) Paper No: OMAE-11-1097; doi: 10.1115/1.4031986 History: Received November 06, 2011; Revised November 05, 2015

Multicomponent taut mooring lines are widely used to secure floating facilities to anchors embedded in the seabed to restrict motions. Optimal design of the mooring line system requires a realistic model of the combined performance of all segments of the mooring line, including the separate segments contained within both the water column and the soil column. This paper presents a two-dimensional quasi-static model, which can analyze mooring lines comprising multiple types of mooring lines or chains, taking into account the effects of ocean currents, soil resistance, and elastic elongation of mooring line. An example analysis is carried out to predict the responses of multicomponent mooring line during pretension and under service conditions. The example analysis puts special focus on conditions where the floating facility undergoes a series of motion away from its original position to assess the effect of the vertical offset is studied in detail. Finally, based on the presented model, the performances of different components of the mooring system are thoroughly investigated and some useful conclusions are drawn.

Copyright © 2016 by ASME
Topics: Mooring , Chain , Soil
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Figures

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Fig. 1

Arrangement of a multicomponent mooring line

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Fig. 2

Forces acting on the mooring line: (a) line suspended in water and (b) line embedded in soil

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Fig. 3

Bearing capacity factor

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Fig. 4

Discrete model for multicomponent mooring line

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Fig. 5

Force sketch of discrete segments: (a) segments in water and (b) segments in soil

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Fig. 6

Module one for the mooring line during pretension

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Fig. 7

Module two for the mooring line in service

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Fig. 8

Line profiles at different pretension levels

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Fig. 9

Uplift angles at different pretension levels

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Fig. 10

Profiles of mooring line at given moments

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Fig. 11

Effect of vertical offsets on the line tension

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Fig. 12

Effect of vertical offset on uplift angle

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Fig. 13

Line profiles for different combination moorings

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Fig. 14

Line tensions of top point under the motion

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Fig. 15

Line tensions under the motion

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