Faculté des Sciences appliquées
Faculté des Sciences appliquées

Investigation of the mechanical behaviour of conical cans with large slopes

De Oliveira Vieira, Marcos Vinicius ULiège
Promotor(s) : Rigo, Philippe ULiège
Academic year : 2022-2023 • Permalink :
Title : Investigation of the mechanical behaviour of conical cans with large slopes
Author : De Oliveira Vieira, Marcos Vinicius ULiège
Advisor(s) : Rigo, Philippe ULiège
Committee's member(s) : Rigo, Philippe ULiège
Language : English
Discipline(s) : Engineering, computing & technology > Mechanical engineering
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master : ingénieur civil mécanicien, à finalité spécialisée en "Advanced Ship Design"
Faculty: Master thesis of the Faculté des Sciences appliquées


[en] Currently, monopile foundations are the most used type of fixed-bottom structures in
the offshore wind industry. The support structure of a fixed offshore wind turbine also
includes a transition piece that connects the monopile to the wind tower. Both monopile
and transition pieces are commonly manufactured from welded cans. Moreover, often this
connection needs to overcome a diameter disparity between the pile and the wind tower.
In a typical design, this transition between diameters is done by using conical cans in the
monopile, in addition to the usual cylindrical ones. The greater the disparity, the greater
the required slope on the conical cans.
However, a non-conventional solution is offered. It consists of performing the diameter
change in the transition piece by means of conical cans. In that sense, the primary steel of
three different transition pieces is designed using a given available clearance based on a
real case situation. In addition, slope angles larger than the current industrial limit of 5°
are considered.
The proposed transition piece concepts are investigated in the face of the applicable
standards for the limit states. The aim is to obtain a minimum thickness of the cans that
complies with all the criteria established by the design standards. Initially, the ultimate
limit states are assessed analytically. Later, a computational analysis using the finite
element method provides comparable results. Moreover, the fatigue limit state is also
studied, especially the stress concentration factors generated by the conical cans and the
effect that the slope angle has on the fatigue life of the cans.
The results indicate how the large slope cans become a critical source of stress intensification
in the transition piece structure by increasing the stress concentration factors, creating
singularity regions, and interfering with the local stress convergence. Finally, a discussion
about manufacturing challenges related to the production of conical cans is introduced for
the case of the proposed designs.



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  • De Oliveira Vieira, Marcos Vinicius ULiège Université de Liège > Master ing. civ. méc. (EMSHIP+)


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