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GTSTRUDL User’s Group

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GTSTRUDL User’s Group

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  1. GTSTRUDL User’s Group Annual Meeting - 2011 BASE PLATE ANALYSIS June 23, 2011Parimal Gandhi, PE Sr. Engineer

  2. PURPOSE • Non-Linear Finite Element Analysis For Base Plate. • AND • Stiffness Analysis For Base Plate.

  3. AGENDA • INTRODUCTION AND THEORY • BASE PLATE MODELING • EDIT THE BASE PLATE INPUT FILE • BASE PLATE STRESSES & BOLTS LOADS • FLEXIBLE & RIGID BASE PLATE RESULTS • CONCLUSION

  4. Introduction & Theory • The finite element method is used to analyze the base plate considering the beam on elastic foundation. • The concrete and bolts are represented by non linear spring elements attached to the nodal points on the steel base plate and to the ground. • The steel base plate is modeled with SBHQ6 • and SBHT6 plate bending element. • Attachments and Stiffeners are modeled as RIGID SOLIDS in the plane of the base plate.

  5. Introduction & Theory The Beam on Elastic Foundation

  6. Introduction & Theory • Non Linear Spring Element • Concrete

  7. Introduction & Theory • Non Linear Spring Element • Bolt

  8. Introduction & Theory Non-linear Spring Curves

  9. Base Plate Modeling • Base Plate Data • Base Plate: ¾” x 12” Dia • 4 ( Four) 5/8” Hilti Kwik Bolt 3 • @ 5” Radius With Minimum • Embed 4” • Attachment : 4” Sch. 40 Pipe • Concrete : f’c = 4000 psi

  10. Base Plate Modeling

  11. Circular Base Plate Modeling

  12. Circular Base Plate Modeling

  13. Circular Base Plate Modeling

  14. Circular Base Plate Modeling

  15. Circular Base Plate Modeling

  16. Circular Base Plate Modeling

  17. Circular Base Plate Modeling

  18. Circular Base Plate Modeling Elements=24x12=288 Joints=289 Joint 289 Element 288

  19. Edit Base Plate Input File The GT Model Wizard creates a GTSTRUDL input file that remains after the Wizard is closed.

  20. Edit Base Plate Input File Soil Spring Values

  21. Edit Base Plate Input File For Attachment Master Joint ‘C1’ Slave Joints 74 to 97

  22. Edit Base Plate Input File For Concrete Stiffness

  23. Edit Base Plate Input File For Concrete Stiffness

  24. Edit Base Plate Input File For Bolt Stiffness

  25. Edit Base Plate Input File For Bolt Stiffness

  26. Edit Base Plate Input File LOADING Non Linear Analysis Output

  27. Base Plate Stresses

  28. Bolt Support Reactions

  29. Square /Rectangular Base Plate Modeling • Base Plate Data • Base Plate: ¾” x 12” x 12” • 4 ( Four) 5/8” Hilti Kwik Bolt 3 • @ 10” c/c With Minimum • Embed 4” • Attachment : TS 4x4x3/8 • Concrete : f’c = 4000 psi

  30. Square /Rectangular Base Plate Modeling

  31. Square /Rectangular Base Plate Modeling

  32. Square /Rectangular Base Plate Modeling

  33. Base Plate odeling Square /Rectangular Base Plate Modeling

  34. Square /Rectangular Base Plate Modeling

  35. Square /Rectangular Base Plate Modeling

  36. Square /Rectangular Base Plate Modeling

  37. Base Plate Modeling Square /Rectangular Base Plate Modeling

  38. Square /Rectangular Base Plate Modeling

  39. Square /Rectangular Base Plate Modeling

  40. Square /Rectangular Base Plate Modeling

  41. Square /Rectangular Base Plate Modeling

  42. Square /Rectangular Base Plate Modeling X Total Joints =169 Total Elements =144 z

  43. Square /Rectangular Base Plate Modeling Master Joint ‘C1’ Spring Element ‘S1’ Spring Element ‘S169’ Slave Joints 57, 61 … 113

  44. Edit Base Plate Input File LOADING Non Linear Analysis `` Output

  45. Square /Rectangular Base Plate Stresses B3 B4 B1 B2

  46. Support Reactions for Bolts

  47. Edit Rigid Base Plate Input File Rigid Attachment Bolt : Pinned Support `` Loading `` Stiffness Analysis `` Output

  48. Flexible & Rigid Base Plate Result Flexible Rigid 339 lbs 423 lbs 949 lbs 949 lbs 9215 psi 9404 psi Δy=0.00361” Δy=0.00432”

  49. THE END Questions? Thank you.