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1 Dr. Jerry G. Rose, PE Professor of Civil Engineering 2 3 4 5 - PowerPoint PPT Presentation

Jun 17, 2023 •304 likes •721 views

1 Dr. Jerry G. Rose, PE Professor of Civil Engineering 2 3 4 5 6a Periodic Replacement of Track Components Periodic Replacement of Track Components 6b 7 8 9 10a 10b 10c 10d Plates Strain gauge Junction Box Pressure Cell Battery LVDT

  1. 1 Dr. Jerry G. Rose, PE Professor of Civil Engineering

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  6. 6a Periodic Replacement of Track Components Periodic Replacement of Track Components

  7. 6b

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  11. 10a

  12. 10b

  13. 10c

  14. 10d

  17. Plates Strain gauge

  18. Junction Box Pressure Cell Battery

  20. LVDT Zero Deflection LVDT Reference Rod Pin

  24. Cell Placement on Asphalt

  26. Cell Location at Richmond 4 3 2 1

  27. Loaded Coal Train at Richmond P ‐ Cell 819 Beneath Rail in Crib P ‐ Cell 820 Beneath Rail and Tie 30 30 2 6 ‐ Axle Locomotives Initial 2 Cars 25 25 Pressure (psi) Pressure (psi) 20 20 2 6 ‐ Axle Locomotives Initial 2 Cars 15 15 10 10 5 5 0 0 9 10 11 12 13 14 15 16 17 18 19 20 21 22 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Time (s) Time (s) P ‐ Cell 821 C/L Track in Crib P ‐ Cell 822 C/L Track and Tie 30 30 25 25 Pressure (psi) 20 20 Pressure 15 15 (psi) 2 6 ‐ Axle Locomotives Initial 2 Cars 2 6 ‐ Axle Locomotives Initial 2 Cars 10 10 5 5 0 0 9 10 11 12 13 14 15 16 17 18 19 20 21 22 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Time (s) Time (s)

  28. Loaded Auto Train at Richmond P ‐ Cell 819 Beneath Rail in Crib P ‐ Cell 820 Beneath Rail and Tie 30 30 1 6 ‐ Axle 1 4 ‐ Axle 1 6 ‐ Axle 1 4 ‐ Axle 25 25 Initial 2 Cars Loco Loco Loco Loco Initial 2 Cars Pressure (psi) Pressure (psi) 20 20 15 15 10 10 5 5 0 0 2 3 4 5 6 7 8 9 10 2 3 4 5 6 7 8 9 10 Time (s) Time (s) P ‐ Cell 821 C/L Track in Crib P ‐ Cell 822 C/L Track and Tie 30 30 25 25 1 6 ‐ Axle 1 4 ‐ Axle 1 6 ‐ Axle 1 4 ‐ Axle Loco Loco Loco Loco Initial 2 Cars Pressure (psi) Initial 2 Cars 20 20 Pressure 15 15 (psi) 10 10 5 5 0 0 2 3 4 5 6 7 8 9 10 2 3 4 5 6 7 8 9 10 Time (s) Time (s)

  29. 2 6 ‐ Axle Locos Initial 6 Cars 2 6 ‐ Axle Locos Initial 6 Cars

  30. 2 6 ‐ Axle Locos Initial 6 Cars

  31. Reduction of Dynamic Stresses 30 8 in. HMA surface Stress (psi) 25 Subgrade surface 20 15 10 5 0 2 3 4 5 6 7 8 9 10 Time (s)

  35. Thickness Vertical Compressive Vertical Compressive Vertical Compressive Ballast/HMA Stress on Ballast Stress on HMA Stress on Subgrade in. KPV/ITD, psi KPV/ITD, psi KPV/ITD, psi 10.0 / 5.0 47.9 / – 21.0 / 16.0 13.6 / – 10.0 / 8.0 48.7 / – 22.0 / 15.0 11.7 / – Thickness Vertical Compressive Vertical Compressive Vertical Compressive Ballast/HMA Stress on Ballast Stress on HMA Stress on Subgrade in. KPV/ITD, psi KPV/ITD, psi KPV/ITD, psi 12.0 / 4.0 43.5 / – 11.7 / 14.9 8.3 / 8.0 8.0 / 8.0 47.0 / – 21.9 / 14.9 8.2 / 7.7

  36. • Peak Dynamic Pressures (286,000 lb cars) ≈ 20 psi max on top of HMA mat ≈ 10 psi max under HMA mat • Dynamic Track Deflections (286,000 lb cars) ≈ 0.25 inch wood tie track ≈ 0.05 inch concrete tie track

  37. • Dynamic Track Modulus (286,000 lb cars) ≈ 2,900 lb/in/in wood tie track ≈ 7,200 lb/in/in concrete tie track • In ‐ Track Pressure Measurements Consistent • CSX Heavy Haul / TTCI High Tonnage Loop

  38. • Moisture Contents of Subgrade / Subballast ‐ Consistent with time ‐ Remain near optimum • Waterproofing and Confinement • HMA Mat – minimum variation in temperatures • Modulus – remains near uniform • Fatigue Life ‐ ?

  39. • Direct Pressure Measurements in Track Structure Compare Favorably with Predicted Pressures form KENTRACK

  40. Bennett McElroy Bei Su Daniel Durrett Lindsay Walker William Long Frank Tuehues Karthik Konduri CSX Transportaion & TTCI (Pueblo)

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