Evaluation of the Ice Load Acting on an Arctic Offshore Structure With Different Ice Drifting Angle

2021 ◽  
Author(s):  
Young-Shik Kim ◽  
Yunho Kim ◽  
Solyoung Han ◽  
Joo-Sung Kim ◽  
Hyunjoe Kim ◽  
...  
Keyword(s):  
Offshore Structure ◽  
Ice Load

Evaluation of the Ice Load Acting on an Arctic Offshore Structure With Different Ice Drifting Angle

2021 ◽  
Author(s):  
Young-Shik Kim ◽  
Yunho Kim ◽  
Solyoung Han ◽  
Joo-Sung Kim ◽  
Hyunjoe Kim ◽  
...  
Keyword(s):  
Offshore Structure ◽  
Ice Load

Ice rubble attenuation of ice loads on arctic offshore structures

1991 ◽  
Vol 28 (6) ◽  
pp. 881-895 ◽  
Author(s):  
T. T. Wong ◽  
N. R. Morgenstern ◽  
D. C. Segoz
Keyword(s):  
Finite Element ◽  
Field Measurements ◽  
Offshore Structures ◽  
Force Transmission ◽  
Offshore Structure ◽  
Element Analysis ◽  
Ice Load ◽  
Broken Ice ◽  
Transmission Capability ◽  
Ice Force

A state of the art survey of ice rubble mechanics is first presented. This survey covers ice rubble morphology, laboratory testing of ice rubble, the study of the load transmission capability of existing rubble fields, and field measurements in ice rubble surrounding offshore structures. Then, the implementation of a new plasticity model for normally consolidated broken ice into an existing finite element stress analysis code is described. The resulting program is validated using triaxial test data. Using this model, a two-dimensional parametric study on ice force transmission through a grounded ice rubble field is performed. The study shows that, in addition to the mechanical properties of ice rubble, the island or berm geometry may significantly affect the ice load. Key words: constitutive model, finite element analysis, ice load, ice rubble, offshore structure, plasticity.

Numerical Simulation of Sea Ice Compressional Strength with Discrete Element Model

2011 ◽  
Vol 268-270 ◽  
pp. 913-918
Author(s):  
Hai Li ◽  
Yu Liu ◽  
Xiang Jun Bi ◽  
Shun Ying Ji
Keyword(s):  
Experimental Data ◽  
Sea Ice ◽  
Element Model ◽  
Discrete Element ◽  
Discrete Element Model ◽  
Offshore Structure ◽  
Ice Load ◽  
Particle Bonding ◽  
Compressional Strength ◽  
Key Parameter

The compressional strength of sea ice is a key parameter to determine the interaction between ice cover and offshore structure. In this study, the discrete element model (DEM) with particle bonding function is adopted to model the sea ice compressional strength. The bonding strength is set as a function of the ice temperature and ice salinity, and their influences on sea ice compressional strength are observed. The simulated results are compared well with the physical experimental data. With the improvement of this DEM, the ice load and ice-induced vibration of offshore structure can be simulated.

Evaluation of the Ice Load Acting on an Arctic Offshore Structure With Different Ice Drifting Angle

2020 ◽  
Author(s):  
Young-Shik Kim ◽  
Yun-Ho Kim ◽  
Hyung-Do Song ◽  
Jin-Ho Jang ◽  
Solyoung Han ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Offshore Structures ◽  
Mean Value ◽  
Experimental Methodology ◽  
The Arctic ◽  
Design Stage ◽  
Ocean Engineering ◽  
Offshore Structure ◽  
Ice Load ◽  
National University

Abstract In this study, an evaluation method and results for ice load acting on an Arctic offshore structure with various ice drifting angles are discussed. Korea Research Institute of Ships and Ocean Engineering (KRISO) has conducted a research project to develop a hull form design for year-round floating type offshore structures in the Arctic condition with dynamic positioning and mooring system. Six cooperating organizations participated in the project: Samsung Heavy Industry, Korean Register, Pusan National University, Korea Maritime & Ocean University, Dong-Eui University, and Inha Technical College. In the design stage of an Arctic offshore structure, ice load consideration is the key component for the safety and reliability analysis. However, there is no generally used tool for evaluation of ice load acting on an Arctic offshore structures. In this study, ice loads acting on an Arctic FPSO in managed ice conditions with various ice drifting angles are examined by experimental methodology. Dramatic mean value changes in ice load with different ice drifting angles are observed in the model test. This experimental ice load evaluation method can be applied to the other types of offshore structure which might operate in sea ice condition.

A Parametric Study of Low-Frequency Damping of Mooring System

2014 ◽  
Author(s):  
Minglu Chen ◽  
Shan Huang ◽  
Nigel Baltrop ◽  
Ji Chunyan ◽  
Liangbi Li
Keyword(s):  
Low Frequency ◽  
Structure Design ◽  
The Body ◽  
Body Motion ◽  
Mooring Line ◽  
Offshore Structure ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Line System ◽  
Irregular Wave

Mooring line damping plays an important role to the body motion of moored floating platforms. Meanwhile, it can also make contributions to optimize the mooring line system. Accurate assessment of mooring line damping is thus an essential issue for offshore structure design. However, it is difficult to determine the mooring line damping based on theoretical methods. This study considers the parameters which have impact on mooring-induced damping. In the paper, applying Morison formula to calculate the drag and initial force on the mooring line, its dynamic response is computed in the time domain. The energy dissipation of the mooring line due to the viscosity was used to calculate mooring-induced damping. A mooring line is performed with low-frequency oscillation only, the low-frequency oscillation superimposed with regular and irregular wave-frequency motions. In addition, the influences of current velocity, mooring line pretension and different water depths are taken into account.

A New Spectral Method for Modeling Dynamic Ice Actions

2004 ◽  
Author(s):  
Tuomo Ka¨rna¨ ◽  
Yan Qu ◽  
Walter L. Ku¨hnlein
Keyword(s):  
Dynamic Response ◽  
Spectral Density ◽  
Time Correlation ◽  
General Purpose ◽  
Density Functions ◽  
Offshore Structure ◽  
Spectral Density Functions ◽  
Ice Force ◽  
Ice Forces ◽  
Scale Data

This paper presents a method of evaluating the response of a vertical offshore structure that is subjected to dynamic ice actions. The model concerns a loading scenario where a uniform ice sheet is drifting and crushing against the structure. Full scale data obtained at the lighthouse Norstro¨msgrund is used in the derivation of a method that applies both to narrow and wide structures. A large amount of events with directly measured local forces was used to derive formulas for spectral density functions of the ice force. A non-dimensional formula that was derived for the autospectrum applies for all ice thicknesses. Coherence functions are used to define the cross-spectra of the local ice forces. The two kind of spectral density functions for local forces can be used to evaluate the spectral density of the total ice force. The method takes account of both the spatial and time correlation between the local forces. Accordingly, the model provides a tool to consider the non-simultaneous characteristics of the local ice pressures while assessing the total ice force. The model can be used in conjunction with general purpose FE programs to evaluate the dynamic response of an offshore structure.

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