Faculté des Sciences appliquées
Faculté des Sciences appliquées

Global Response Analysis of the Jack-up Platform Odin

Tran, Viet Hai ULiège
Promotor(s) : Kaeding, Patrick ; Wenzel, Sebastian
Date of defense : 2014 • Permalink :
Title : Global Response Analysis of the Jack-up Platform Odin
Author : Tran, Viet Hai ULiège
Date of defense  : 2014
Advisor(s) : Kaeding, Patrick 
Wenzel, Sebastian 
Committee's member(s) : Rigo, Philippe ULiège
Language : English
Number of pages : 171
Discipline(s) : Engineering, computing & technology > Civil engineering
Target public : Researchers
Professionals of domain
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master de spécialisation en construction navale
Faculty: Master thesis of the Faculté des Sciences appliquées


[en] A jack up vessel is a type of mobile platform which is capable of elevating its hull form above the water surface. A Jack up vessel is normally used in offshore construction area for the purposes of transportation, installation and maintenance. Odin, named after the Nordic Father God, is one platform in the fleet of HOCHTIEF solutions AG. The jack up is used for offshore projects in different locations. Hence, it is necessary to understand the behaviour of the Odin under different environmental conditions.
The operational profile of a jack up vessel can be divided into three main modes, namely floating mode, operational mode and survival mode. The scope of the thesis is to conduct a global response analysis of the Odin in the operational and survival modes. The main objective is to establish the envelopes of feasible environmental conditions depending on water depth, leg penetration, and deck load components.
In order to fulfil the goal, the jack-up Odin is modelled and analysed using the ANSYS APDL software package. The finite element model (FEM) of the Odin is built based on detail equivalent structure calculations. Finite element analyses conducted include linear static analyses, nonlinear static analyses and dynamic analyses. Also, dynamic amplification factors (DAF) are determined for each environmental load case. Sub-structuring technique is assessed and applied to most of analyses to reduce the computation time.
The work is performed complying with requirements of SNAME 5-5A - Guidelines for Site Specific Assessment of Mobile Jack-Up Units. The parts which are not covered by the guidelines are performed complying with other guidelines, namely DNV-RP-C205 – Environmental Conditions and Environmental Loads and EUROCODE 3 – Design of steel structures
The main finding of the thesis is the ultimate weather conditions regarding wave heights and wind speeds for different water depths and leg penetrations. Besides, suggestions for structural improvements are also made in order to extend the operational limitation.



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