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Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
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Torsional hull girder response of containerships – feasible with Cargo Hold models?

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Nguyen, Ngoc Do ULiège
Promotor(s) : Bronsart, Robert ; Kaeding, Patrick ; Rorup, Jorg ; Rathje, Helge
Date of defense : 2012 • Permalink : http://hdl.handle.net/2268.2/6098
Details
Title : Torsional hull girder response of containerships – feasible with Cargo Hold models?
Author : Nguyen, Ngoc Do ULiège
Date of defense  : 2012
Advisor(s) : Bronsart, Robert 
Kaeding, Patrick 
Rorup, Jorg 
Rathje, Helge 
Committee's member(s) : Boote, Dario 
Language : English
Number of pages : 72
Discipline(s) : Engineering, computing & technology > Civil engineering
Target public : Researchers
Professionals of domain
Student
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master de spécialisation en construction navale
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] The analysis of warping stresses and hatch opening deformations is an essential part of the
containerships’ structural design. These vessels also call for detailed investigations of the hull
girder response to torsion and to hull girder bending in order to predict fatigue damage and
buckling capacity.
The global strength analysis which takes into account all hull girder sectional load
components, i.e, vertical bending, horizontal bending, vertical shear, horizontal shear and
torsion is to obtain a reliable description of the overall hull girder stiffness, to calculate and
assess the global stresses and deformations of all primary hull members for specified load
cases resulting from realistic loading conditions including the wave-induced forces and
moments. This method is able to verify the structural adequacy of the longitudinal and
transverse primary structure, particularly the influence of torsional moment on side shell
longitudinals, radii of the hatch corners as well as face plates and horizontal girders of the
transverse bulkheads.
The current Cargo Hold model is able to carry out a global strength analysis by calculating
and assessing the combined stresses and deformations in the midship area for specified load
cases in head and following sea only, including wave-induced loads as well as vertical hull
girder bending.
This study aims to analyze the feasibility of using the Cargo Hold model to analyze the
torsional effects in oblique sea on containerships by justifying and developing a new set of
boundary conditions. The two criteria used to adjust the boundary conditions are the relative
deflexions of hatch diagonals and the longitudinal stress in the coaming and bilge areas.
These criteria are compared between Cargo Hold finite element (FE) model and Entire FE
model in different loading cases. The GL computer program SHIPLOAD, which is a linear
frequency-domain hydrodynamic load generation program based on strip theory is used to
calculate ship accelerations and wave-induced pressures corresponding to different load cases.
Two ships of different sizes (2700 TEU and 11000 TEU) have been analysed. By numerical
analyses, it is shown that the current boundary constraint beams should be stiffer in the case
where high torsional moment exists in the midship area in order to have a correct relative
deflexion. Also, the warping stresses are shown to be independent of the constraint beam
stiffness.


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Author

  • Nguyen, Ngoc Do ULiège Université de Liège - ULiège >

Promotor(s)

Committee's member(s)

  • Boote, Dario
  • Total number of views 13
  • Total number of downloads 251










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