Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007
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WP 5 DOME and RISER-TUBE ASSESMENT (STRUCTURAL BEHAVIOUR) Solver: ABAQUS standard 6.6.4 March 2007 PowerPoint PPT Presentation


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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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WP 5 DOME and RISER-TUBE ASSESMENT (STRUCTURAL BEHAVIOUR) Solver: ABAQUS standard 6.6.4 March 2007

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Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

WP 5

DOME and RISER-TUBE ASSESMENT

(STRUCTURAL BEHAVIOUR)

Solver: ABAQUS standard 6.6.4

March 2007


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.

Boundary conditions: x, y, z displacements constrained.

Truss elements (only axial stiffness)

Rigid ring.


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

SCENARIO 1:

- Vertical load (1000 or 2000 Tn)

F vertical

Linear behaviour is verified


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

A’

A

Lateral reaction at the top of the dome due to the current over riser tube: 1,182·106 N.

  • SCENARIO 2:

  • Vertical load (1000 or 2000 Tn)

  • +

  • Lateral load 118 Tn.

F vertical

F lateral

Non linear behaviour is observed


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

  • SCENARIO 3:

  • Vertical load (1000 or 2000 Tn)

  • +

  • Lateral load 118 Tn.

  • +

  • Pressure over dome due to current. Integrated by 5 concentrated loads in each cable. Every 20 meters height.

F vertical

F lateral


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

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


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

SCENARIO 3 (1000 Tn): ANCHORING LOADS


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

SCENARIO 3 (2000 Tn): ANCHORING LOADS


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

SCENARIO 3 (2000 Tn – speed 0.6 m/s): CABLE STRESSES


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

SCENARIO 3 (1000 Tn): CABLE STRESSES


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

SCENARIO 3 (2000 Tn): CABLE STRESSES


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

SCENARIO 3. VERTICAL DISPLACEMENT OF THE RIGID RING.

Ring displacement


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

SCENARIO 3. HORIZONTAL DISPLACEMENT OF THE RIGID RING.

Ring displacement


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

  • RISER TUBE DETAILS:

  • Detailed FE model of riser tube between two rings (50m).

    • Cables:

    • Number: 6.

    • Material: Dyneema.

    • Diameter: 98 mm.

    • Young modulus: 65190 MPa.

    • Section: 4970 mm2.

    • Minimum Break Load: 5838 kN.

  • Pipe:

  • Outer diameter: 2m.

  • Wall thickness: 76.9mm (77mm).

  • Material: PE100.

  • Modulus of elasticity at time cero: 1050MPa.

  • Modulus of elasticity after 50 years: 200MPa.

  • Design stress at time cero: 9.4MPa.

  • Design stress after 50 years: 6.3 MPa.


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

  • Boundary Conditions and Loads:

    • Vertical load: (1000Tn and 2000Tn).

    • Pressure map around the tube (1,29 m/s).

  • P = 0.5 * Cp * density * vel^2


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

  • RISER TUBE DETAILS:

  • Hypothesis:

  • Detailed FE model of riser tube between two rings (50m).

  • Rigid and fixed rings.

  • Only lateral forces transmitted between cables and tube.

  • (vertical pre-tension is not transmitted to the PE-pipe).

  • At time 0:

  • Maximum lateral displacement of PE pipe between two rigid rings: 131mm

  • After 50 years:

  • Maximum lateral displacement of PE pipe between two rigid rings: 680mm


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

  • RISER TUBE DETAILS:

  • Hypothesis:

  • Detailed FE model of riser tube between two rings (50m).

  • Rigid and fixed rings.

  • Properties at time 0.

  • Only lateral forces transmitted between cables and tube.

  • (vertical pre-tension is not transmitted to the PE-pipe).

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)


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

RISER TUBE DETAILS:

Cable stresses:


Wp 5 dome and riser tube assesment structural behaviour solver abaqus standard 6 6 4 march 2007

  • CONCLUSIONS:

    • Dome:

      • The dome is feasible till a bottom current velocity of about 0.3 a 0.4 m/s

        (without taking into account dynamic effects)

    • Riser tube:

      • A riser tube with rings minimal every 50 meter is needed to avoid large displacements of the tube within the Dyneema cables


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