Transcription of Offshore Structural Design - Structural Engineers
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Offshore Structural Design - Structural Engineers
11 Offshore Structural DesignOffshore Structural DesignDetail EngineeringDetail EngineeringFixed PlatformsFixed of Fixed Platforms3 Design of structuresIn-place Phase (Piles, Jacket ,Deck Integral)Three types of analysis are performed: Survival state----- wave/current/wind attack with 50 or 100 years recurrence period. Operational state--- wave/current/wind attack with 1 or 5 years recurrence period, under full operation. Fatigue assessment for Design life. analyses are performed on the complete and intact structure. Assessments at damaged structures, with one member deleted, and assessments of collision situations are occasionally of structures(contd) Majority of Structural analyses are based on the linear theory of elasticity for total system behaviour. Dynamic analysis is performed for the system behaviour under wave-attack if the natural period exceeds 3 seconds. 5 Structure GeometryJacket configuration depends of of : They areRisers , Boat Landing , Barge bumpersRiser guards, Pumps or Model Preparation- JacketsJacket structure shall be modelled as a 3D space frame.
structural offshore code, Regulations of a major certifying authority. – DnV: Rules for the classification of fixed offshor e installations. – AISC: Specification for the design, fabrication an d erection of structural steel for buildings. American Institute of Steel Construction . Widely used structural code
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