SUC Brasil 2012 : Engineering Study for Barge Lifting Weight on Crane Barge Overload Test

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Presented at SUC by Guilherme Leal from Proper Marine.

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SUC Brasil 2012 : Engineering Study for Barge Lifting Weight on Crane Barge Overload Test

  1. 1. Engineering Study for Barge Lifting Weight on Crane BargeOverload TestBernardo XavierGuilherme LealThayanna AraujoRio de Janeiro – 03/12/2012
  2. 2. MotivationTypical crane overload test description;
  3. 3. MotivationLoad curve estimate for overload test procedures;
  4. 4. MotivationSimple engineering for overload test weight determination;Overload test engineering becomes tricky when lift weightincreases; - HARD TO CALIBRATE - DINAMIC BEHAVIOUR
  5. 5. MotivationSolution?- Modify the concept of the test weight. TEST BARGEEngineering?- Loading conditions and draft marks definition;- Evaluation of the structural integrity of the test barge and lifting padeyes;
  6. 6. Objectives- Engineering study for crane overload test for SWL 2050 tonsmaximum load curve; - Test weight shall be a calibrated ballasted deck barge;Crane barge main particulars: Test barge main particulars Length over all 110 m Length over all 59.90 m Molded breadth 39 m Molded breadth 21.36 m Molded depth 7 m Molded depth 4.2 m Main hook capacity 2050 ton Deadweight 3000 ton
  7. 7. Design premissesThe maximum overload weight shall be 2255 tons, which considers a10% overload factor of a maximum safe working load of 2050 tons.A total of five loading conditions shall be tested: Load Condition Total (ton) 1 720.72 2 1186.15 3 1596.45 4 1782.02 5 2255.02The test barge was carefully selected for the lifting weight purposein which shall be fully lifted out of the water in order to provide aaccurate and realistic results of the overload test as well as thecalibration of the load cells for the crane barge;
  8. 8. Design premissesFor structural integrity analysis, DNV SESAM software package wasused:- GeniE V5.3-10: Local and global structural analysis;- SESTRA 8.4-01: Linear Structural analysis- Submod V6.1-05: Submodeling coupling from global to local FEmodel;- Xtract 3.0-00: Post-process of the structural results;
  9. 9. Design premissesStructural evaluation of test barge (DEC Criteria);
  10. 10. Lifting configurationTypical spreader bar scheme;
  11. 11. Lifting pointsTypical 4 lifting point design;
  12. 12. Lifting Padeyes DesignPadeye design for SWL 650 tons based on “N2683 – EstruturasOceânicas – Olhal de içamento – Dimensionamento”.Special consideration for weld shear stress stiffness and loadtransfer to the test barge;
  13. 13. Engineering Study for Barge Lifting Weight on Crane BargeOverload TestGlobal FEM model O QUE ? COMO ?
  14. 14. Engineering Study for Barge Lifting Weight on Crane BargeOverload TestGlobal FEM model mesh size = 0.5m; O QUE ? COMO ?
  15. 15. Engineering Study for Barge Lifting Weight on Crane BargeOverload TestTypical ballasted load condition;
  16. 16. Engineering Study for Barge Lifting Weight on Crane BargeOverload TestLocal FEM model
  17. 17. Engineering Study for Barge Lifting Weight on Crane BargeOverload TestLocal FEM model mesh size = 0.05m;
  18. 18. Engineering Study for Barge Lifting Weight on Crane BargeOverload TestVon mises stress results (Max allowable = 225 MPa) (Max load case);
  19. 19. Engineering Study for Barge Lifting Weight on Crane BargeOverload TestAnalytical hull girder bending check;Bending moments, normal stresses and shear stress along the hull.
  20. 20. Engineering Study for Barge Lifting Weight on Crane BargeOverload Test Bending moments x length Normal Stresses x length 2,00E+05 3,00E+07 1,50E+05 Bending Moment (Pa) 2,00E+07 1,00E+05 Normal Stress (Pa) 5,00E+04 1,00E+07 0,00E+00 0,00E+00 0,5 4 7,5 11 14,5 18 21,5 25 28,5 32 35,5 39 42,5 46 49,5 53 56,5 59,9 -5,00E+04 0,5 3,5 6,5 9,5 12,5 15,5 18,5 21,5 24,5 27,5 30,5 33,5 36,5 39,5 42,5 45,5 48,5 51,5 54,5 57,5 -1,00E+07 -1,00E+05 -1,50E+05 -2,00E+07 -2,00E+05 -3,00E+07 Length (m) Length (m) Shear Stresses x length 3,00E+06 RESULTS ARE IN 2,00E+06 Shear Stress (Pa) 1,00E+06 0,00E+00 ACCORDANCE WITH 0,5 4 7,5 11 14,5 18 21,5 25 28,5 32 35,5 39 42,5 46 49,5 53 56,5 59,9 -1,00E+06 -2,00E+06 FEM ANALYSIS -3,00E+06 -4,00E+06 Length (m)
  21. 21. Advantages of using SESAM software• User friendly interface for complex geometry modeling;• Easy to model structures which optimizes precious time on overall project schedule;• Great result analysis tools for stress plots;
  22. 22. ConclusionSESAM software package was highly suitable for theproposed study in which demonstrated that the test bargehas adequate structural integrity for the proposed loadingconditions;Crane barge overload actual test is scheduled for January2013;

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