Strength assessment of transversal T-beam webs in cruise ships

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master_Pudovkin_Mikhail_2017.pdf (7.52 MB)

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Insinööritieteiden korkeakoulu | Master's thesis
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Date

2017-08-28

Department

Major/Subject

Nordic Master in Maritime Engineering

Mcode

ENG3034

Degree programme

Master’s Programme in Mechanical Engineering

Language

en

Pages

56+11

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Abstract

Shipyards are increasing production efficiency. The main means to achieve higher efficiency are reducing the number of structural parts and increasing manufacturing automation. Potential target for the improvements would be design of transversal T-beams webs. This thesis presents strength assessment method for evaluation transversal T-beam webs in cruise ships. The method is based on nonlinear finite element method and shell element mesh for ultimate strength and linear analysis and Timoshenko beam elements for the load assessment. Generic loading is applied to T-beams as a load vectors in nonlinear analysis to evaluate capacity using buckling, yielding and ultimate limit state criteria. The obtained strength of T-beams is compared against realistic loading calculated with linear analysis. The main realistic loadings were presented: global still water and wave loads, local deck pressure and block lifting. The method is applied to a two case studies. Case study one compares the effect of the tripping brackets. It is discovered that strength is not increased significantly in case of 0, 1 and 2 tripping brackets. However, the presence of the tripping brackets significantly increase post buckling capacity of the T-beams. Case study two shows an approximate range of production induced damage. Induced damage is caused by different bending sequences from transportation, welding, blocks balancing, block lifting etc. which lead to plastic deformations of T-beams. The magnitude of production induced damage is found to be significantly higher than combined contribution from operational loads.

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Supervisor

Romanoff, Jani

Thesis advisor

Laakso, Aleksi
Niemelä, Ari

Keywords

ship, strength, T-beam, FEM

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https://urn.fi/URN:NBN:fi:aalto-201709046899

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