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SesamTM
40 years of success
Sesam for collapse analysis


Pål Dahlberg, Sesam Principal Sales Executive
17 April, 2012
Benefits from using Sesam for jackets
New builds covering Manage existing                                              Collapse analysis        Modification work
  entire life cycle re-analysis models                                            Requalification           - all phases




MTO, deflection check,                          Understand models over time,   Extreme conditions,          Design of new parts
 code check, fatigue                              produce and view results   accidents, fire, explosion     Re-design of existing


                    Same model for all stages – can be shared with other units like the floating department
SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.                                2
Non-linear analysis
             -              Re-qualification
             -              Accidents
             -              Collapse & large scale deformations
             -              Fire & explosions


SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.   3
The SESAM suite of programs
Packages:

DeepC
 Coupled global
response
 of moored deep water
 floating systems

GeniE
 Design of beam and
 plate offshore
structures

HydroD
 Hydrodynamic
analysis
of ship and floating
offshore structures




SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.   4
Our tools – your solutions – your decisions


                                                                   xml          xml




  Transportation, launching                                                                                Transportation, lifting
  Deflections, Stresses,                                                                                   Deflections, Stresses,
  Code-check, Fatigue                                                                                      Code-check, Fatigue



                                                     fem




                                            Non-linear analysis,             Linear analysis (wave, pile/soil)
                                            collapse, accidents,             Deflections, Stresses,
                                            re-qualifications                Code-check, Fatigue, Earthquake

SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.                            5
Structural analysis & design
  Non-linear analysis
      - Accidents: Member yields and changes shape
          - Impact, Collision, Explosion, Dropped objects
      - Geometry changes significantly
          - Lifting operations, cable structures
      - Loads depend on structural response
          - Wave, current, wind, motions

      - Static analysis
          - Ultimate strength, Energy absorption
      - Dynamic simulation (of real events)
          - Collision, explosion, motions
          - Environment (wave, buoyancy, stability, wind)
      - Foundation
          - Pile, soil, spudcan (jack-up)
      - Temperature effects
          - Changed material properties, Fire




SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.               6
Non-linear analysis
  USFOS is a specialized tool for ultimate resistance
   evaluation of typical offshore structures
      - Increased efficiency
      - Better numerical predictions
      - Lower threshold for new users to enter complex physics

  The ultimate resistance of a structure is important
   for many reasons
      - New loading conditions, linear design exceeded, e.g.
          - Extreme waves, increased explosion pressure
          - Increased platform weight, extra conductors
      - Damaged structure (cracks etc) – necessary to repair
        immediately?
      - Energy absorption performance
          - Boat landing, crane operations/dropped objects, vessel
            impact etc.




SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.              7
Non-linear analysis in Usfos
  Why non-linear
      - Linear codes cannot describe ductility
        (metal)

      - Linear codes cannot account for the
        change in geometry for increasing
        loads

      - Usfos includes “all” physical effects and
        predicts the “real” behaviour of a
        structure




SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.       8
Importing models into Usfos
                       Model consistency :

                                                      GeniE          Sacs
                                      Model
                                      Wave loads
                                      Soil




                      The Sacs input file          The GeniE model   The Usfos model

SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.             9
Importing models to Usfos
  Migration to Usfos
      - Detailed model not needed for Collapse analysis
          - This model would benefit from a “clean-up”
      - Deck plating  Coarse Mesh
          - Necessary to get rid of the small gaps
      - Beams  One element per physical member
          - Enough for detection of buckling & Plastic Hinges (end
            nodes + middle of beam)
      - Gravity + Explicit Deck Loads + Wave load (to be
        exported to Usfos)
          - More loads can easily be imported to Usfos, but they
            should be relevant for collapse analysis
      - Remove Dummy beams  Not relevant for non-linear
        analysis
      - Wave loads exported from GeniE as explicit loads
          - No need to define wave data and hydrodynamic
            coefficients in Usfos



SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.              11
Importing models to Usfos
  How to do it?
      - Start Usfos (Xact) and import the structure and wave load data




SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.      12
Collapse analysis
  History Plots
      - Global Load vs. Displacement of Control Node (normally a node with large displacements)
      - Global Stiffness vs. Step Numbers




SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.     13
Collapse analysis
  Displacements                                      Plastic utilization




SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.   14
Collapse analysis
  Element forces




SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.   15
Boat impact


  Boat Impact
      -   Energy specified by user to be dissipated
      -   Local Denting of Tube
      -   Buckling & Plastic Hinges for local Hit Member
      -   Fracture Criteria based on strains
          - In this case when less 0.15
      - Global Deformation of the Global Model




SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.        16
Boat impact
  History Plots (Global Load = 1, means              Plastic utilisation
   Max Impact Energy)
      - Shown for control node




SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.   17
Safeguarding life, property
       and the environment

       www.dnv.com




SesamTM
13 December 2011
© Det Norske Veritas AS. All rights reserved.   18

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Sesam for Collapse Analysis

  • 1. 1 SesamTM 40 years of success Sesam for collapse analysis Pål Dahlberg, Sesam Principal Sales Executive 17 April, 2012
  • 2. Benefits from using Sesam for jackets New builds covering Manage existing Collapse analysis Modification work entire life cycle re-analysis models Requalification - all phases MTO, deflection check, Understand models over time, Extreme conditions, Design of new parts code check, fatigue produce and view results accidents, fire, explosion Re-design of existing Same model for all stages – can be shared with other units like the floating department SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 2
  • 3. Non-linear analysis - Re-qualification - Accidents - Collapse & large scale deformations - Fire & explosions SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 3
  • 4. The SESAM suite of programs Packages: DeepC Coupled global response of moored deep water floating systems GeniE Design of beam and plate offshore structures HydroD Hydrodynamic analysis of ship and floating offshore structures SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 4
  • 5. Our tools – your solutions – your decisions xml xml Transportation, launching Transportation, lifting Deflections, Stresses, Deflections, Stresses, Code-check, Fatigue Code-check, Fatigue fem Non-linear analysis, Linear analysis (wave, pile/soil) collapse, accidents, Deflections, Stresses, re-qualifications Code-check, Fatigue, Earthquake SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 5
  • 6. Structural analysis & design  Non-linear analysis - Accidents: Member yields and changes shape - Impact, Collision, Explosion, Dropped objects - Geometry changes significantly - Lifting operations, cable structures - Loads depend on structural response - Wave, current, wind, motions - Static analysis - Ultimate strength, Energy absorption - Dynamic simulation (of real events) - Collision, explosion, motions - Environment (wave, buoyancy, stability, wind) - Foundation - Pile, soil, spudcan (jack-up) - Temperature effects - Changed material properties, Fire SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 6
  • 7. Non-linear analysis  USFOS is a specialized tool for ultimate resistance evaluation of typical offshore structures - Increased efficiency - Better numerical predictions - Lower threshold for new users to enter complex physics  The ultimate resistance of a structure is important for many reasons - New loading conditions, linear design exceeded, e.g. - Extreme waves, increased explosion pressure - Increased platform weight, extra conductors - Damaged structure (cracks etc) – necessary to repair immediately? - Energy absorption performance - Boat landing, crane operations/dropped objects, vessel impact etc. SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 7
  • 8. Non-linear analysis in Usfos  Why non-linear - Linear codes cannot describe ductility (metal) - Linear codes cannot account for the change in geometry for increasing loads - Usfos includes “all” physical effects and predicts the “real” behaviour of a structure SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 8
  • 9. Importing models into Usfos Model consistency : GeniE Sacs Model Wave loads Soil The Sacs input file The GeniE model The Usfos model SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 9
  • 10. Importing models to Usfos  Migration to Usfos - Detailed model not needed for Collapse analysis - This model would benefit from a “clean-up” - Deck plating  Coarse Mesh - Necessary to get rid of the small gaps - Beams  One element per physical member - Enough for detection of buckling & Plastic Hinges (end nodes + middle of beam) - Gravity + Explicit Deck Loads + Wave load (to be exported to Usfos) - More loads can easily be imported to Usfos, but they should be relevant for collapse analysis - Remove Dummy beams  Not relevant for non-linear analysis - Wave loads exported from GeniE as explicit loads - No need to define wave data and hydrodynamic coefficients in Usfos SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 11
  • 11. Importing models to Usfos  How to do it? - Start Usfos (Xact) and import the structure and wave load data SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 12
  • 12. Collapse analysis  History Plots - Global Load vs. Displacement of Control Node (normally a node with large displacements) - Global Stiffness vs. Step Numbers SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 13
  • 13. Collapse analysis  Displacements  Plastic utilization SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 14
  • 14. Collapse analysis  Element forces SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 15
  • 15. Boat impact  Boat Impact - Energy specified by user to be dissipated - Local Denting of Tube - Buckling & Plastic Hinges for local Hit Member - Fracture Criteria based on strains - In this case when less 0.15 - Global Deformation of the Global Model SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 16
  • 16. Boat impact  History Plots (Global Load = 1, means  Plastic utilisation Max Impact Energy) - Shown for control node SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 17
  • 17. Safeguarding life, property and the environment www.dnv.com SesamTM 13 December 2011 © Det Norske Veritas AS. All rights reserved. 18