Presentation by Pal Dahlberg on Seminar Design of Fixed Structures with DNV Software (April 2012)

1. STRENGTH AT SEA INTEGRITY MANAGEMENT RISK AND RELIABILITY
SesamTM
40 years of success
How to import a Sacs model into GeniE
Ole Jan Nekstad
15 March 2012

2. Importing a Sacs model into GeniE
 General about the Sacs  GeniE data translation
 What can be automatically imported
 What must be manually modified
 How to verify that the GeniE model is the same as the Sacs model
 How to run linear analysis of the imported model
 How to look at results of the imported model
 What purposes can the imported model serve
 Use GeniE version 6.2 or later
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15 March 2012
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3. Capabilities and Limitations
 Listed in separate document
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4. Automatic import
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5. How to import a model from Sacs
 The procedure today
- Import structure (automatic)
- Import wave load data (automatic)
- Import load combinations (automatic)
- Add soil data, blanket and wind loads
- Verify model with previous reports or model data
- Run a linear static analysis and verify selected key results (displacements, forces and
stresses)
 You can do it
- Without training or assistance
- By reading our tutorial
- Learning from a course where the goal is to import 3 structures
- We can do it as a consulting service to you
 Once the model is verified it can be used for all purposes in Sesam
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15 March 2012
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6. Import structure, loads, wave data and load combinations
 Remember to specify database units before importing
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7. Decide how to import
 Normally use the following settings if there is wave data. For topsides ignore «import
wave load data»
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8. Joint and beam numbers - 1
 The imported model has the same number as the Sacs model
 For the purpose of change capacity and making a true GeniE model you should
change the mesh settings to «always regenerate mesh»
 When you make a new analysis the finite element
numbers will change
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15 March 2012
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9. Joint and beam numbers - 2
 If you want to keep the same finite element numbers for existing structure
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10. Analysis, loads and wave loads
 Analysis set-up, loads, wave loads and load combinations are part of the Activity
 If all data has been correctly
imported you can run analysis
and look at results
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11. How do you know that all has
been imported correctly?
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12. Check the log file after import
 The log file is located in the workspace
- Data not converted is listed in the beginning of log file
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13. Check the quality of the model
 The verify feature can detect problems and help you understand the model
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14. Compare GeniE model with Sacs model
 Graphical visualisation and easy to query
object properties
- Structure – model, point masse and sets
- Total mass and centre of gravity
- Properties – sections, materials & hydro-
coefficients
- Local co-ordinate systems – beams and
plates
- Loads – both manually applied and waves
- Load combinations – loads and scaling
factors
- Soil layers
- Displacements, stresses, forces, deflections
for single load-case(s) or envelope
 From reports
- All above
- Maximum wave shear and overturning
moment
- Load sums and reaction forces
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15. Which purposes can an imported
Sacs model serve once it is inside
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16. Our tools – your solutions – your decisions
Transportation, launching Transportation, lifting
Deflections, Stresses, Deflections, Stresses,
Code-check, Fatigue Code-check, Fatigue
Non-linear analysis, Linear analysis (wave, pile/soil)
collapse, accidents, Deflections, Stresses,
re-qualifications Code-check, Fatigue, Earthquake
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15 March 2012
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17. Benefits by 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 others for collaboration
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18. Safeguarding life, property
and the environment
www.dnv.com
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