Faculté des Sciences appliquées
Faculté des Sciences appliquées

Structural scantling of yachts: different direct calculations vs. numerical analysis

Sipauba Rocha Coelho Santos, Marianna ULiège
Promotor(s) : Rigo, Philippe ULiège
Academic year : 2022-2023 • Permalink :
Title : Structural scantling of yachts: different direct calculations vs. numerical analysis
Author : Sipauba Rocha Coelho Santos, Marianna ULiège
Advisor(s) : Rigo, Philippe ULiège
Committee's member(s) : Rigo, Philippe ULiège
Language : English
Number of pages : 153
Discipline(s) : Engineering, computing & technology > Multidisciplinary, general & others
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] Nowadays yacht’s superstructures represent a real complex problem to structural engineers.
Ship’s structural calculations already constitute a difficult task, but when it comes to
yachts the level of compromise for this design field is increased. Since the main purpose
of these type of ships is usually leisure, the general arrangement, aesthetics and clients
requirements are prioritized. Therefore, the yacht structure needs to fulfill these constraints
and, actually, enable most of them. This fact is amplified for the superstructure area. The
most common desired large windows, open spaces, pools and jacuzzi are only possible
because of the complex structure behind it.
In this work, the superstructure of a real yacht is analyzed in terms of two different classification societies: Lloyd’s register and ABS. The first part consisted into performing rule-based
calculations in order to verify and compare both register’s requirements. To achieve that
two python codes were created based on each classification society rules. In the end, it was
also possible to implement an optimization procedure in order to obtain the lighter structural design possible for the study case. The comparisons shown that LR is more severe
for safety coefficients, but ABS compensates that with higher requirements for design loads.
Finally, the second part of the study was to perform a finite element analysis for the
optimized structure. The idea was to evaluate the proposed design in terms of its structural
reliability and to comprehend if there was space for further improvements. The FEA was
performed for the deck pressures load case. The results were positive for most locations,
and shown some localized problems. Specific locations appear to need local reinforcement,
while other would require geometrical smoothing. At last, it was possible to state that a
satisfactory design was proposed. Future works could involve, however, other load cases to
evaluate possible different weak locations.
Keywords: classification society, direct calculation, finite element method, finite element
analysis, python, rule-based design, yacht structural design.



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  • Sipauba Rocha Coelho Santos, Marianna ULiège Université de Liège > Master ing. civ. méc. (EMSHIP+)


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