Using the software USFOS from DNV, Fabio Orsini from Promon Engenharia presented this at SUC.

1. Nonlinear Analysis of
Offshore Steel Jackets:
Study and Application of the Quasi-Static
Pushover Method
Fábio Orsini
Structural Engineer – Promon Engenharia
Professor – Universidade Federal do Rio de Janeiro
Sesam User Conference 2012 – Rio de Janeiro, Brazil

2. Agenda
1 INTRODUCTION
2 MOTIVATION
3 JUSTIFICATION
4 STEEL JACKETS
5 TUBULAR JOINTS
6 SOIL-PILE INTERACTION
7 MEMBER MODELING
8 USFOS SOFTWARE
9 PROTEUS JACKET
10 ANALYSIS RESULTS
2
ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

3. 1 INTRODUCTION
OFFSHORE STEEL JACKETS ARE COMPLEX STRUCTURES SUBMITTED
TO A GREAT SET OF DIFFERENT LOADS AND ENVIRONMENTAL ACTIONS.
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

4. 2 MOTIVATION
MANY OF THESE STRUCTURES ARE MORE THAN 25 YEARS OLD AND
SOME MORE ARE GETTING THERE  SAFETY IS THE MAIN ISSUE.
TROPICAL CYCLONE CATARINA,
PIPER ALPHA, 1988
2004
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

5. 3 JUSTIFICATION
YET, MANY OTHER JACKETS ARE BEING BUILT  INFIELD SYSTEMS
PREDICTS MORE THAN USD81Bi UNTIL 2016 FOR NEW CONSTRUCTIONS
PRA-1 (PETROBRAS)
PMXL-1 (PETROBRAS)
MOP-1 (PETROBRAS)
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

6. 4 STEEL JACKETS
3D TRUSS-WORK FRAMED SYSTEMS: (MOST OF THEM) MAY BE
DESIGNED AS QUASI-STATIC STRUCTURES
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

7. 5 TUBULAR JOINTS
BOUWCAMP, 1980 AND MORIN et al., 1998  LOCAL JOINT FLEXIBILITIES
CHANGE STRUCTURAL RESPONSE.
BARLTROP et al., 1984 , FESSLER et al., 1986 AND BUITRAGO et al., 1993
 MODELS FOR PREDICTING LOCAL JOINT FLEXIBILITIES.
DIER et al., 2000 (MSL ENGINEERING JIP PROJECT)  NON LINEAR
FORCE X DISPLACEMENT CURVES FOR LOCAL JOINT FLEXIBILITIES.
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

8. 5 TUBULAR JOINTS
FESSLER et al., 1986 AND BUITRAGO et al., 1993  PARAMETRIC
EQUATIONS FOR LINEAR ELASTIC JOINT FLEXIBILITIES.
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

9. 5 TUBULAR JOINTS
FESSLER et al., 1986 AND BUITRAGO et al., 1993  PARAMETRIC
EQUATIONS FOR LINEAR ELASTIC JOINT FLEXIBILITIES.
9
ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

10. 5 TUBULAR JOINTS
FESSLER et al., 1986 AND BUITRAGO et al., 1993  PARAMETRIC
EQUATIONS FOR LINEAR ELASTIC JOINT FLEXIBILITIES.
10
ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

11. 5 TUBULAR JOINTS
DIER et al., 2000 (MSL ENGINEERING JIP PROJECT)  NON LINEAR
FORCE X DISPLACEMENT CURVES FOR LOCAL JOINT FLEXIBILITIES.
11
ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

12. 5 TUBULAR JOINTS
DIER et al., 2000 (MSL ENGINEERING JIP PROJECT)  NON LINEAR
FORCE X DISPLACEMENT CURVES FOR LOCAL JOINT FLEXIBILITIES.
12
ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

13. 6 SOIL-PILE INTERACTION
THREE CURVES: P-Y, T-Z AND Q-Z RELATIONSHIPS FOR DESCRIBING
SOIL REACTIONS
P-Y
T-Z
Q-Z
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

14. 6 SOIL-PILE INTERACTION
P-Y T-Z
Q-Z
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

15. 7 MEMBER MODELING
NON LINEAR ANALYSIS MUST ACCOUNT FOR GEOMETRIC AND
MATERIAL NONLINEARITIES  LARGE DISPLACEMENTS DOMAIN
NON LINEAR ANALYSIS MUST ACCOUNT POST-BUCKLING BEHAVIOR OF
COMPRESSED TUBULAR MEMBERS  INITIAL IMPERFECTIONS
15
ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

16. 8 USFOS SOFTWARE
SPECIFIC GEOMETRIC MODEL CONSTRUCTED USING GENIE 
CONVERTING TO USFOS
ENVIRONMETAL LOADS AND PILE MODELING ARE ALL DEFINED USING
USFOS ITSELF
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

17. 8 USFOS SOFTWARE
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

18. 8 USFOS SOFTWARE
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

19. 9 PROTEUS JACKET
28 METERS WATER DEPTH  NATURAL GAS EXPLOTATION SYSTEM
SUPPORT PLATFORM  UNMANNED
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

20. 10 ANALYSIS RESULTS
20
ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

21. 10 ANALYSIS RESULTS
21
ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

22. 10 ANALYSIS RESULTS
22
ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

23. 10 ANALYSIS RESULTS
23
ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.

24. THANK YOU ALL!
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ORSINI, F., Non Linear Analysis of Offshore Steel Jackets: Study and Application of the Quasi-Static Pushover Method. DNV Sesam User Conference
2012, Rio de Janeiro, Brazil.