Response Spectra Analysis of a Liquid Storage Tank

Response Spectra Analysis of a Liquid Storage Tank PowerPoint PPT Presentation


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Contents. IntroductionBackgroundTank GeometryProblem DescriptionProblem ApproachPre-processingTank Wizard vs. ExcelJoint CoordinatesElement IncidencesApplying LoadsAnalysisSub dividing Input FilesPost-processingP-M Interaction curvesExport GT Strudl Output to ExcelSecondary Loading (T

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Response Spectra Analysis of a Liquid Storage Tank

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1. Response Spectra Analysis of a Liquid Storage Tank

2. Contents Introduction Background Tank Geometry Problem Description Problem Approach Pre-processing Tank Wizard vs. Excel Joint Coordinates Element Incidences Applying Loads Analysis Sub dividing Input Files Post-processing P-M Interaction curves Export GT Strudl Output to Excel Secondary Loading (Thermal Load) Results

3. Background Nuclear Power Plant 3 Units Pressurized Water Nuclear Reactor System 3 x Turbine Generators (1311, 1314 and 1247 MWe) Refueling Water Tank Capacity – 750,000 Gallons Stores borated water for refueling

4. Tank Geometry Tank Properties: Seismic Category I Wall thickness 1’ - 9” Mat depth 4’ - 0” Wall height 68’ - 0” Water volume 750,000 gal Embedment 13’ – 10”

5. Problem Description An additional 3’-0” of water required. Overstress (Dead Load + EQ. Load) Vertical Reinforcing Steel @ wall base mat junction (20%) Hoop Reinforcing Steel @ El. 129’ – 0” (9.5%)

6. Problem Description (cont’d)

8. Contents Background Tank Geometry Problem Description Possible Approach Pre-processing Tank Wizard vs. Excel Joint Coordinates Element Incidences Applying Loads Analysis Sub dividing Input Files Post-processing P-M Interaction curves Export GT Strudl Output to Excel Secondary Loading (Thermal Load) Results

9. Pre processing Use of GT STRUDL Tank Wizard vs. Excel

10. Pre processing (cont’d) Rectangular basemat possible Rectangular plate elements possible Customized plate element size possible.

11. Pre processing (cont’d) X = R Sin ? Z = R Cos ? Y - varies

12. Pre processing (cont’d)

13. Pre processing (cont’d) Loads considered Dead Hydrostatic Hydrodynamic Earthquake Thermal

14. Pre processing (cont’d)

15. Pre processing (cont’d)

16. Pre processing (cont’d)

17. Pre processing (cont’d)

18. Pre processing (cont’d)

19. Pre processing (cont’d)

20. Pre processing (cont’d)

21. Contents Background Tank Geometry Problem Description Possible Approach Pre-processing Tank Wizard vs. Excel Joint Coordinates Element Incidences Applying Loads Analysis Sub dividing Input Files Post-processing P-M Interaction curves Export GT Strudl Output to Excel Secondary Loading (Thermal Load) Results

22. Analysis Analysis Split in to 4 parts: Static Analysis Eigen Value Analysis Response Spectrum Analysis Post Processing Small input files help in managing the whole analysis and also in debugging the input files.

23. Contents Background Tank Geometry Problem Description Possible Approach Pre-processing Tank Wizard vs. Excel Joint Coordinates Element Incidences Applying Loads Analysis Sub dividing Input Files Post-processing P-M Interaction curves Export GT Strudl Output to Excel Secondary Loading (Thermal Load) Results

24. Post processing Tank Body Vertical Reinforcing steel Hoop Reinforcing steel Radial shear and Tangential shear Basemat Reinforcing Steel in orthogonal directions Section shear.

25. Post processing (cont’d) Check Vertical and Hoop Reinforcing Steel (P,M) sets are plotted on existing Interaction charts.

26. Post processing (cont’d) Response Spectrum analysis gives the maximum peak values of displacements and forces. Stat : Static Load RS : Response Spectra Load Consider load cases:

27. Post processing (cont’d)

28. Post processing (cont’d)

29. Post processing (cont’d)

30. Post processing (cont’d) Tank Body Vertical Reinforcing Steel OK Hoop Reinforcing Steel OK Radial Shear OK Tangential Shear OK Basemat Reinforcing Steel (N-S) OK Reinforcing Steel (E-W) OK Shear OK

31. Post processing (cont’d) Under thermal loading – concrete already cracked Concrete sectional properties change A second model used with changed sectional properties Results from Primary loading and Thermal loading combined Externally.

32. Post processing (cont’d)

33. Post processing (cont’d) Tank Body Vertical Reinforcing Steel OK Hoop Reinforcing Steel OK Radial Shear OK Tangential Shear OK Basemat Reinforcing Steel (N-S) OK Reinforcing Steel (E-W) OK Shear OK

34. Post processing (cont’d)

35. Post processing (cont’d)

36. Post processing (cont’d)

37. Post processing (cont’d)

38. Post processing (cont’d)

39. Post processing (cont’d)

40. Post processing (cont’d)

41. Results No overstress in the tank (existing water level). Tank can accommodate an additional 3 ft of water.

42. GT Strudl and Excel GT STRUDL Technically solid Simple command structure Helps creating input files easily Command line gives more control over the analysis Database driven system Helps dividing the analysis in to smaller portions Helps in input file debugging Saves time in debugging Excel Ability to import large data and manipulate Macros help in data formatting and manipulation.

43. Questions ?

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