Faculté des Sciences appliquées
Faculté des Sciences appliquées

Analytical and Numerical Buckling analysis for Cruise Vessel specific Structures

Garcia Humia, Alejandro ULiège
Promotor(s) : Kaeding, Patrick
Date of defense : 2019 • Permalink :
Title : Analytical and Numerical Buckling analysis for Cruise Vessel specific Structures
Author : Garcia Humia, Alejandro ULiège
Date of defense  : 2019
Advisor(s) : Kaeding, Patrick 
Language : English
Discipline(s) : Engineering, computing & technology > Mechanical 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


[fr] Buckling is one of the main failure modes in ship structures subjected to compressive loading and it is of crucial importance fort the overall structural strength. This Thesis is based in the buckling analysis of unstiffened plates and stiffened panels which form the basic building block and load bearing element in ship structure.
Different structural arrangements based on a global cruise vessel of 342 m long are derived. The analysis considers unstiffened plates, stiffened panels and an enhanced model for the stiffened panel including surrounding heavy members such as girders and frames. A comparison between analytical, semi-analytical (PULS) and numerical methods (Non-linear Finite Element Method) is performed for longitudinal and transverse loading conditions.
The increase in structural capacity due to the influence of surrounding structures and their influence in the boundary conditions is derived through the numerical method. Initial imperfections introduced by scaling the buckling eigenmode according to production standards as well as non-linear large deflection and material effects are considered.
Moreover, the agreement between the semi-analytical and numerical method is analysed. A trend is observed, PULS tends to underestimate the ultimate capacity for thin structures while for thick structures tends to overestimate it. This trend arises from PULS assumption of neglecting the effect of bending stress in the limit state yield criteria, which tends to become significant as the thickness increase.
Finally, given that PULS is a code for rules checking purposes according to DNV and IACS, the increase in strength by applying an Ultimate Limit State design is derived with results provided by the numerical enhanced model.




  • Garcia Humia, Alejandro ULiège Université de Liège - ULiège >


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