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68 m Offshore Jacket Platform & Topside
Verification of global frame stability, wave-current hydrodynamic resistance, and topside dynamic sway for a 68 m offshore fixed jacket platform.
Offshore fixed jacket platforms in harsh marine environments must support heavy production facilities while resisting violent 100-year storm wave forces, sea currents, and earthquake vibrations. The submerged four-leg tubular space frame transfers immense overturning moments down to seabed pile anchorages. WebCAE computes coupled frame and shell behavior: battered tubular legs, X-braced lateral panels, conductor guide pipes, Cellar and Main decks, and the cantilevered helideck.
1. Geometry & FEA Mesh
- •5-tier battered tubular jacket (z = 0..60 m): 28×28 m seabed footprint tapering to 16×16 m at topside interface, legs Ø1200×40 mm, and braces Ø600×25 mm
- •4 internal well conductor guide pipes Ø762×25 mm spanning the entire height to the seabed
- •Three MITC4 shell decks: Cellar Deck at z = 60 m (24×24 m, t = 18 mm), Main Deck at z = 68 m (24×24 m, t = 18 mm), and cantilevered Helideck at z = 71 m (t = 12 mm)
- •FEA model combining 81 MITC4 quadrilateral shell elements and 438 Timoshenko beam elements (1,050 DOFs)
2. Loads & Boundary Conditions
- •Fixed seabed pile foundation constraints for all 4 main legs and 4 well conductors at mudline level (z = 0)
- •800 t total topside equipment mass (250 t drilling derrick, 300 t gas processing units, 250 t living quarters and power modules) with 25 kPa live loads
- •Hydrodynamic storm wave lateral forces stepped up to 240 kN per leg node along the wave direction (+X)
3. Simulation Results & Findings
- ✓Critical buckling factor λ₁ = 19.47 confirms large structural stability margin against leg compressive buckling under combined wave overturning and gravity
- ✓Fundamental horizontal sway vibration frequency f₁ = 1.654 Hz avoids cyclic resonance with predominant sea wave periods (8–14 s)
- ✓Cantilevered helideck support struts maintain high rigidity without excessive vibration during helicopter landings
Offshore energy operators and marine engineering firms utilize WebCAE to assess fixed platform structural integrity and wave fatigue resistance in browser sessions. Fast solver turnaround allows teams to verify storm survivability, optimize tubular steel tonnage, and ensure full compliance with ISO 19902 and API RP 2A standards.
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- ✓Nonlinear Contact & Buckling (Kσ, MITC4, RBE2/RBE3)
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