Effect of Failure Mode of Taut Mooring System on the Dynamic Response of A Semi-Submersible Platform

Abstract Floating Storage and Regasification Unit (FSRU) becomes one of the most popular equipment in the industry for providing clean energy due to its technical, economic and environmental features. Under the combined loads from wind, wave and current, it is difficult for the prediction of the dynamic response for such FSRU-LNGC (Liquified Natural Gas Carrier) side-by-side mooring system, because of the complicated hydrodynamic interaction between the two floating bodies. In this paper, a non-dimensional damping parameter of the two floating bodies is obtained from a scaled model test. Then the numerical analysis is carried out based on the test results, and the damping lid method is applied to simulate the hydrodynamic interference between floating bodies. The dynamic response of the side-by-side mooring system including six degrees of freedom motion, cable tension and fender force are provided and analyzed. According to the comparisons between numerical results and the test results, it is shown that the proposed coupled analysis model is reliable, and the numerical analysis can properly describe the dynamic response of the multi-floating mooring system in the marine environment. Moreover, the non-dimensional damping parameter which is used in numerical analysis can act as a good reference to the dynamic response analysis of similar multi-floating mooring systems.

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Dynamic response characteristics and failure mode of slopes on the loess tableland using a shaking-table model test

Landslides ◽

10.1007/s10346-020-01373-y ◽

2020 ◽

Vol 17 (7) ◽

pp. 1561-1575 ◽

Cited By ~ 2

Author(s):

Zhi-jian Wu ◽

Duo-yin Zhao ◽

Ai-lan Che ◽

Da-wei Chen ◽

Chao Liang

Keyword(s):

Dynamic Response ◽

Failure Mode ◽

Model Test ◽

Shaking Table ◽

Response Characteristics ◽

Table Model ◽

Dynamic Response Characteristics ◽

Shaking Table Model Test

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Dynamic Response and Failure Mode Analysis on Light-Weight Steel Columns under Blast Loads

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.166-169.1489 ◽

2012 ◽

Vol 166-169 ◽

pp. 1489-1497 ◽

Cited By ~ 1

Author(s):

Shi Yan ◽

Lei Liu ◽

Peng Li ◽

Zhi Qiang Xin ◽

Bao Xin Qi

Keyword(s):

Dynamic Response ◽

Failure Mode ◽

Failure Modes ◽

Shear Failure ◽

Mode Analysis ◽

Material Strength ◽

Light Weight ◽

Blast Loads ◽

Element Analysis ◽

Steel Columns

The dynamic response and failure mode of light-weight steel columns under blast loads were studied in this paper by using nonlinear finite element analysis (FEA) software ANSYS/ LS-DYNA, aiming to develop the degree and modes of the excessive plastic deformation during failures of the columns under diverse parameters. The damaged columns with initial blast-induced deformation may evidently influence vertical stability of light-weight steel frame structures. During the numerical simulation, the element of three dimensional solid SOLID164 was used, and the strain rate effect on material strength was included in the material model with Plastic-Kinematic (MAT-03). The main parameters included in the analysis were boundary conditions, scaled distances of explosions, and the vertical compressive load ratios applied on tops of the columns. The results showed that the column with both two fixed ends was the most beneficial to resist blast shock wave, the horizontal displacement at the middle span of the columns were obviously decreasing as increasing of the scaled distances of the explosion, and the axial compression ratio only significantly influenced the column with a sliding end. The failure modes of the developed columns may be summarized as bending failure, direct shear failure, and bending shear combination failure.

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Mooring with Multicomponent Cable Systems

Journal of Energy Resources Technology ◽

10.1115/1.3227853 ◽

1980 ◽

Vol 102 (2) ◽

pp. 62-69 ◽

Cited By ~ 9

Author(s):

K. A. Ansari

Keyword(s):

Dynamic Response ◽

System Design ◽

Mooring Line ◽

Analysis Tool ◽

Mooring System ◽

Practical Application ◽

Analysis Techniques ◽

Anchoring System ◽

Cable Systems ◽

Stiffness Characteristics

Relative to the present-day need for offshore operations involving the use of moored vessels, mooring system design has become quite complex. Since a proper choice of mooring line components in the form of anchors, clump weights, chains and cables is vital for vessel station-keeping and mooring system survival, the adequacy of the mooring system under consideration must be checked out by suitable analysis techniques. This paper gives a general discussion of the various mooring line components available for use, presents an analysis tool to determine the stiffness characteristics of a multicomponent cable including the effect of line stretch, and demonstrates how these could be included in the dynamic analysis of an offshore construction vessel moored by a multileg anchoring system. The maximum limiting tension of the mooring line considered, which is a combination of anchors, clump weights, chains and cables is determined from the several breaking strengths and anchor capacities associated with the various cable configurations that can occur. Finally, in order to illustrate a practical application, the dynamic response of a moored production barge subjected to external environmental forces is examined.

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