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W1 tracks kirse jb

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Transcript

  • 1.  
  • 2. By: Ken Kirse Civil Engineer, TriMet
  • 3. Light Rail Track Design
    • Wheel-Rail Interface
    • Track Design
    • Light Rail Track Materials
    • Track Road Crossings
    • Drainage
    • Special Trackwork
    • Noise and Vibration
    • Electrical Isolation
  • 4. Wheel – Rail Interface
    • Wheels
    • Where does flange go
  • 5.  
  • 6.  
  • 7.  
  • 8.  
  • 9. Why are flanges on the inside of wheels?
  • 10. Rail Sections
    • “ Tee” Rails
    • Girder Rails
  • 11.  
  • 12.  
  • 13.  
  • 14.  
  • 15.  
  • 16. Curving Characteristics
    • With solid axles
    • With stub axles
  • 17.  
  • 18.  
  • 19. Track Design
    • Gage
    • Tie and ballast open track
    • Basis of design of tie and ballast track
    • Embedded on paved track
  • 20.  
  • 21.  
  • 22.  
  • 23.  
  • 24.  
  • 25. Modulus of Track Elasticity (  )
    • Defined as the load per unit length of rail required to depress that rail by one unit.
    • p = -  y
    • p = upward pressure per unit length
    •  = track modulus of elasticity (track stiffness)
    • y = vertical deflection of rail
    •   with wood ties  = 2000 Avg., 1000 poor, 5000 stiff
  • 26. Maximum Deflection Y 0 of Rail
    • Y 0 = maximum deflection (x=0, under wheel)
    • p = Dynamic wheel load (static load + 1% per MPH over 5 MPH)
    •  = Modulus of elasticity of rail steel (30 x 10 6 psi)
    •  = Moment of Inertia of rail (65.6 in 4 for 115RE)
    • = Track modulus of elasticity
    •   AREMA recommended limit of deflection is 0.25”
    Y 0 = p (64  3 ) ¼
  • 27. Maximum Rail Bending Moment (M 0 ) M 0 = p  64  ¼
  • 28. Maximum Rail Bending Stress C = distance in inches from the base of rail to its neutral axis AREMA recommended maximum = 25,000 psi Rail steel yield point = 70,000 psi M 0 C  S =
  • 29. Ballast Pressure Under Centerline of Tie (P C ) P a = uniformly distributed pressure over the tie face h = depth below bottom of tie in inches P c of 20 psi is AREMA suggested value for firm subgrade soil. P C = 16.8 P a h 1.25
  • 30. Unit Pressure (P a ) Transmitted from Bottom of Tie to Ballast (psi) P = wheel load (lbs) 2P = Total tie load L = Tie length in inches b = Tie width in inches 2/3 = factor for 2 load bearing thirds of tie P a should not exceed 65 psi for wood ties 85 psi for concrete ties P a = 2P 2/3 bL 3P bL =
  • 31. Rail Stress from Temperature Change 115RE rail Area = 11.2465 sq.in. Moment of Inertia about neutral axis  = 65.9 Yield Strength 70,000 psi min. Modulus of elasticity “E” 30x10 6 psi To determine tensile force for temperature change. Rail changes 0.0000065 of its length per degree. F S = unit stress . 0000065  t = S 30,000,000
  • 32. Rail Stress from Temperature Change For 70  F change Total Restraining Force F = 70x195 x 11.2465 F = 153,515 lbs Yield Point of 115 # Rail 70,000 x 1102465 = 787,255 lbs Insulated Joints tested to 600,000 lbs For 1  F change S = 30,000,000 x 0.0000065x1 = 195 psi
  • 33.  
  • 34.  
  • 35. Embedded Track
    • Aesthetics
    • Maintenance considerations
    • Concrete track slabs
    • Covered tie and ballast track
  • 36.  
  • 37.  
  • 38.  
  • 39.  
  • 40.  
  • 41.  
  • 42.  
  • 43.  
  • 44.  
  • 45.
    • Common on bridges
    • DF fasteners
    • Methods of construction
    Direct Fixation Track
  • 46.  
  • 47.  
  • 48.  
  • 49. Material for Light Rail Track
    • Ties
    • Bumping posts
    • Switch heater
    • Switch stands
    • Insulated joints
    • Automatic train stop
  • 50.  
  • 51.  
  • 52.  
  • 53.  
  • 54.  
  • 55.  
  • 56.  
  • 57.  
  • 58.  
  • 59.  
  • 60. Light Rail Track Road Crossings
    • Design considerations
    • Crossing materials
    • Drainage
  • 61.  
  • 62.  
  • 63. Light Rail Track Drainage
    • Open track under drains
    • Paved track drainage
    • Special Trackwork Drainage
  • 64.  
  • 65.  
  • 66. Special Trackwork
    • Definition of turnout components
    • Turnout size, frog number
    • Frog types
    • Girder rail turnouts
    • Rail crossings, restraining rail
  • 67.  
  • 68.  
  • 69.  
  • 70.  
  • 71.  
  • 72.  
  • 73.  
  • 74.  
  • 75.  
  • 76.  
  • 77. Noise and Vibration
    • Problem Areas
    • Tri-Met history with Westside Project
    • Noise and vibration mitigation
  • 78. P49
  • 79.  
  • 80. P51
  • 81. P52
  • 82.  
  • 83.  
  • 84.  
  • 85.  
  • 86.  
  • 87.  
  • 88.  
  • 89. Electrical Isolation
    • Causes of stray current
    • Why is stray current a problem?
    • Methods of controlling stray current
    • Monitoring stray current
  • 90.  
  • 91.