internal pressure able to compensate the total concreting loads. It provides weather protection during the construction phase of the inner steel tank and the installation of the bottom insulation (Icing, snow and wind condition). The steel plates are closely connected to the concrete by studs. Annexes A & B have been added to show the steel roof erection phases. The study has been performed in finite elements. The software used is ESA-Prima Win Version 3.50 from the company SCIA Calculation rules: The elements dimensioning is in suit with the following European regulation: • EC3 for the verifications • EC1 for the climatic loads • Standards and DTU in force relating to steel structures LNG tanks (two) General data Height: 49 metres Diameter: 76 metres Capacity: 125 000 cubic metres each Storage temperature: -163°C Completion: LNG1, July 2005, LNG 2, August 2005 Main contractor, storage tanks and ship loading systems: Tractebel Industry Engineering Sub-contractors: Outfitting: Entrepose Contracting Installation of ship loading system and low-pressure flare: Fabricom Concrete work: NCC Model & boundary conditions Type of structure • Number of nodes: 2352 • Number of members: 1543 • Number of 1D macros: 177 • Number of bound. lines: 2356 • Number of 2D macros:1121 • Number of profiles: 8 • Number of cases:13 • Number of materials: 2 Material S 275 S 355 List of material The total weight of the structure: 620891,84 kg Group of members: 1/1543 Macro2D Group of members: 1/1124 Conclusion • The linear analysis confirms that all individual load and loads combination are acceptable regarding the EC.3 (with applicable safety factors and allowable stresses). • The governing case is the 3rd case for non uniform snow load; the actual steel allows a concrete pouring in one layer with pressurization of the steel roof. • A survey of the snow height on the roof is required to guaranty the snow limit of the uniform case. • The next governing case is the 7th case for internal pressurization before concreting of the steel roof. • The structural beam and liner plates are suitable for the climatic condition and for the construction loads at different stages during winter time and before concrete pouring of the dome roof. • Non linear analysis of 2nd order according EC3 made the demonstration of the model convergence, there no plastic zone in the model after 50 iterations of 2nd order. Steel roof erection phases The purpose of the second part is to demonstrate that the erection phase of the steel roof will not produce over-stresses, excessive deformation and displacements in the roof element or in the central mast by a FEA verification at different stages of the erection procedure E066-AS-M-KK0104 (86600-EE35-PPR-104) to insure the final shape of the structure. The calculation note is aiming at verifying the steel elements part of the LNG container roof. The study has been performed in finite elements. The software used is ESA-Prima Win Version 3.50 from the company SCIA. 145
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