Elasto-Plastic Analysis of an Offshore Construction...Marianne Gudnor Philippe Sicabaig Karolis...
Transcript of Elasto-Plastic Analysis of an Offshore Construction...Marianne Gudnor Philippe Sicabaig Karolis...
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Elasto-Plastic Analysis of an Offshore Construction
Finite Element Method Final Project 2009
Made by
Marianne Gudnor
Philippe Sicabaig
Karolis Matulevicius
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Elasto-Plastic Analysis of an Offshore Construction
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Seipem 7000General characteristics
Class and type: Semi‐submersible crane vessel
Displacement: 172,000 t (heavy lift)
Length: 198 m (overall)
Beam: 87 m
Height: 43.5 m (keel to deck)
Draft: 10.5 metres (34 ft) (transit)18.0 metres (59 ft) (survival)
27.5 metres (90 ft) (heavy lift)
Installed power: 70,000 kW
Propulsion: 12 thrusters
Speed: 9.5 knots (18 km/h)
Crew: Up to 700 persons
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Analyzed elementsAnalyzed elements
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Analyzed elementsAnalyzed elementsAnalyzed elements
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Analyzed elements
IPE 500
L = 1m
D = 1.8m
h = 1m
b = 0.08m
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From 3D to 2D
The view of the top
The view of the front
From 3D to 2D
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Tension - CompressionCompressionTension
We calculated the thickness to have the same area for the section.
(IPEarea)/200 = 58mm
We calculated also the thickness of the weld.
(IPEarea+Weldarea)/230=52,8mm
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Tension - Compression
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Tension
Plastification starts at 55 kN
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Compression
Plastification starts at 82,5 kNPlastification starts at 82,5 kN
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Drawing
Because of the grid in Comsol, we had to make an approximation in the drawing.
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The maximum moment before the breaking is 149 kN.m.
First calculation with a moment involved by two horizontal forces
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Plastification starts for a bending moment of 53,64 kN.m.
It starts at the connection between the tube and the IPE profile.
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The structure totally plastifies in the middle of the beam.
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Second calculation with a moment involved by a vertical force
The maximum moment before the breaking is 149 kN.m.
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Plastification starts for a bending moment of 64,4 kN.m.
It starts at the connection between the tube and the IPE profile.
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The structure totally plastifies at the level of the joint.
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Thank you for your attention!