Vertical and horizontal pullout capacity of mooring lines embedded in very soft clays

2021 ◽  
Vol 234 ◽  
pp. 109229
Author(s):  
Naloan Coutinho Sampa ◽  
Fernando Schnaid ◽  
Marcelo Maia Rocha ◽  
Roberto Cudmani ◽  
Claudio dos Santos Amaral
Keyword(s):  
Pullout Capacity ◽  
Mooring Lines ◽  
Soft Clays

A Research on Tension Determination and Morphological Simulation Model of Mooring Lines

ICTIS 2013 ◽  
2013 ◽  
Author(s):  
Shengli Li ◽  
Zhengwei He ◽  
Jia Shi ◽  
Youqin Zheng ◽  
Xiaoqiao Geng ◽  
...  
Keyword(s):  
Simulation Model ◽  
Mooring Lines

USING FIELD DATA FOR THE EVALUATION OF THE IMPACT OF ULTRA-LOW FREQUENCY MOTIONS ON THE FATIGUE OF MOORING LINES

2019 ◽  
Author(s):  
Guilherme Borzacchiello ◽  
Carl Albrecht ◽  
Fabricio N Correa ◽  
Breno Jacob ◽  
Guilherme da Silva Leal
Keyword(s):  
Field Data ◽  
Low Frequency ◽  
Mooring Lines ◽  
The Impact

Development of Design Charts for Installation of Granular Piles in Soft Clays

2019 ◽  
Author(s):  
Akash Jaiswal ◽  
Rakesh Kumar ◽  
Sareesh Chandrawanshi
Keyword(s):  
Soft Clays ◽  
Design Charts ◽  
Granular Piles

scholarly journals Compressibility Characteristics of Soft Clays Treated by Graphene

2020 ◽  
Vol 978 ◽  
pp. 012035
Author(s):  
Mohammed Y. Fattah ◽  
Sinan A. Al-Haddad ◽  
Kumail R. Al-Khafaji
Keyword(s):  
Soft Clays ◽  
Compressibility Characteristics

scholarly journals Time and Frequency Domain Dynamic Analysis of Offshore Mooring

2021 ◽  
Vol 9 (7) ◽  
pp. 781
Author(s):  
Shi He ◽  
Aijun Wang
Keyword(s):  
Dynamic Analysis ◽  
Frequency Domain ◽  
Time Domain ◽  
Linearization Method ◽  
Euler Method ◽  
Single Component ◽  
Hydrodynamic Drag ◽  
Lumped Mass ◽  
Mooring Lines ◽  
The Time Domain

The numerical procedures for dynamic analysis of mooring lines in the time domain and frequency domain were developed in this work. The lumped mass method was used to model the mooring lines. In the time domain dynamic analysis, the modified Euler method was used to solve the motion equation of mooring lines. The dynamic analyses of mooring lines under horizontal, vertical, and combined harmonic excitations were carried out. The cases of single-component and multicomponent mooring lines under these excitations were studied, respectively. The case considering the seabed contact was also included. The program was validated by comparing with the results from commercial software, Orcaflex. For the frequency domain dynamic analysis, an improved frame invariant stochastic linearization method was applied to the nonlinear hydrodynamic drag term. The cases of single-component and multicomponent mooring lines were studied. The comparison of results shows that frequency domain results agree well with nonlinear time domain results.

scholarly journals Transient Responses Evaluation of FPSO with Different Failure Scenarios of Mooring Lines

2021 ◽  
Vol 9 (2) ◽  
pp. 103
Author(s):  
Dongsheng Qiao ◽  
Binbin Li ◽  
Jun Yan ◽  
Yu Qin ◽  
Haizhi Liang ◽  
...  
Keyword(s):  
Service Condition ◽  
Mooring Line ◽  
Mooring System ◽  
Transient Effects ◽  
Floating Platform ◽  
Transient Responses ◽  
Mooring Lines ◽  
Performance Deterioration ◽  
Steady State Responses ◽  
Influence Process

During the long-term service condition, the mooring line of the deep-water floating platform may fail due to various reasons, such as overloading caused by an accidental condition or performance deterioration. Therefore, the safety performance under the transient responses process should be evaluated in advance, during the design phase. A series of time-domain numerical simulations for evaluating the performance changes of a Floating Production Storage and Offloading (FPSO) with different broken modes of mooring lines was carried out. The broken conditions include the single mooring line or two mooring lines failure under ipsilateral, opposite, and adjacent sides. The resulting transient and following steady-state responses of the vessel and the mooring line tensions were analyzed, and the corresponding influence mechanism was investigated. The accidental failure of a single or two mooring lines changes the watch circle of the vessel and the tension redistribution of the remaining mooring lines. The results indicated that the failure of mooring lines mainly influences the responses of sway, surge, and yaw, and the change rule is closely related to the stiffness and symmetry of the mooring system. The simulation results could give a profound understanding of the transient-effects influence process of mooring line failure, and the suggestions are given to account for the transient effects in the design of the mooring system.

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