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- Dr. Jerry G. Rose, PE
1 Dr. Jerry G. Rose, PE Professor of Civil Engineering 2 3 4 5 - - PowerPoint PPT Presentation
1 Dr. Jerry G. Rose, PE Professor of Civil Engineering 2 3 4 5 - - PowerPoint PPT Presentation
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
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6a
Periodic Replacement of Track Components Periodic Replacement of Track Components
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6b
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10a
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10b
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10c
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10d
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Plates Strain gauge
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Pressure Cell Junction Box Battery
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Zero Deflection Reference Rod LVDT LVDT Pin
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Cell Placement on Asphalt
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Cell Location at Richmond
2 1 4 3
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5 10 15 20 25 30 9 10 11 12 13 14 15 16 17 18 19 20 21 22
Initial 2 Cars 2 6‐Axle Locomotives
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2 6‐Axle Locomotives Initial 2 Cars
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2 6‐Axle Locomotives Initial 2 Cars
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2 6‐Axle Locomotives Initial 2 Cars
Loaded Coal Train at Richmond
P‐Cell 822 C/L Track and Tie P‐Cell 820 Beneath Rail and Tie P‐Cell 821 C/L Track in Crib P‐Cell 819 Beneath Rail in Crib
Time (s) Time (s) Time (s) Time (s) Pressure (psi) Pressure (psi) Pressure (psi) Pressure (psi)
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5 10 15 20 25 30 2 3 4 5 6 7 8 9 10 5 10 15 20 25 30 2 3 4 5 6 7 8 9 10 5 10 15 20 25 30 2 3 4 5 6 7 8 9 10
5 10 15 20 25 30 2 3 4 5 6 7 8 9 10
Initial 2 Cars Initial 2 Cars Initial 2 Cars Initial 2 Cars 1 6‐Axle Loco 1 4‐Axle Loco 1 6‐Axle Loco 1 4‐Axle Loco 1 6‐Axle Loco 1 4‐Axle Loco 1 6‐Axle Loco 1 4‐Axle Loco
Loaded Auto Train at Richmond
P‐Cell 822 C/L Track and Tie P‐Cell 820 Beneath Rail and Tie P‐Cell 821 C/L Track in Crib P‐Cell 819 Beneath Rail in Crib
Time (s) Time (s) Time (s) Time (s) Pressure (psi) Pressure (psi) Pressure (psi) Pressure (psi)
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2 6‐Axle Locos Initial 6 Cars 2 6‐Axle Locos Initial 6 Cars
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2 6‐Axle Locos Initial 6 Cars
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5 10 15 20 25 30 2 3 4 5 6 7 8 9 10 Time (s) Stress (psi) 8 in. HMA surface Subgrade surface
Reduction of Dynamic Stresses
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Thickness Ballast/HMA in. Vertical Compressive Stress on Ballast KPV/ITD, psi Vertical Compressive Stress on HMA KPV/ITD, psi Vertical Compressive Stress on Subgrade 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 Ballast/HMA in. Vertical Compressive Stress on Ballast KPV/ITD, psi Vertical Compressive Stress on HMA KPV/ITD, psi Vertical Compressive Stress on Subgrade 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
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- 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
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- 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
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- 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 ‐ ?
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- Direct Pressure Measurements in Track
Structure Compare Favorably with Predicted Pressures form KENTRACK
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