WP 5 DOME and RISER-TUBE ASSESMENT (STRUCTURAL BEHAVIOUR) Solver: ABAQUS standard 6.6.4 March 2007. DOME DETAILS: Number of cables: 12. Material: Dyneema. Young modulus: 65130 MPa. Diameter: 98 mm. Section: 4970 mm2. Minimum Break Load: 5838 kN. FE model.
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DOME and RISER-TUBE ASSESMENT
Solver: ABAQUS standard 6.6.4
Boundary conditions: x, y, z displacements constrained.
Truss elements (only axial stiffness)
- Vertical load (1000 or 2000 Tn)
Linear behaviour is verified
Lateral reaction at the top of the dome due to the current over riser tube: 1,182·106 N.
Non linear behaviour is observed
Based on the small differences showed beside for the two different speeds analysed, the same pressure distribution (Cp-values) has been used to obtain the pressure at different speeds.
P = 0.5 * Cp * density * vel^2
SCENARIO 3 (1000 Tn): ANCHORING LOADS
SCENARIO 3 (2000 Tn): ANCHORING LOADS
SCENARIO 3 (2000 Tn – speed 0.6 m/s): CABLE STRESSES
SCENARIO 3 (1000 Tn): CABLE STRESSES
SCENARIO 3 (2000 Tn): CABLE STRESSES
SCENARIO 3. VERTICAL DISPLACEMENT OF THE RIGID RING.
SCENARIO 3. HORIZONTAL DISPLACEMENT OF THE RIGID RING.
At time 0:
Maximum stress of PE tube between two rigid rings: 1.67MPa
(Design stress at time cero: 9.4MPa)
After 50 years
Maximum stress of PE tube between two rigid rings: 1.75MPa
(Design stress at time cero: 6.3MPa)
RISER TUBE DETAILS:
(without taking into account dynamic effects)