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LOAD RATING BY MANUAL CALCULATIONS

LOAD RATING BY MANUAL CALCULATIONS. RC_ SLAB BRIDGE RATING Amjad Waheed, PE Ohio Department of Transportation. Agenda – Day 1. 8:00 am – 8:15 am Introductions and House Keeping 8:15 am – 8:45 am Session 1: Load Rating Basics 8:45 am – 9:30 am Session 2: Basic Load Rating Calculations

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LOAD RATING BY MANUAL CALCULATIONS

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  1. LOAD RATING BY MANUAL CALCULATIONS RC_ SLAB BRIDGE RATING Amjad Waheed, PE Ohio Department of Transportation Load Rating

  2. Agenda – Day 1 8:00 am – 8:15 am Introductions and House Keeping 8:15 am – 8:45 am Session 1: Load Rating Basics 8:45 am – 9:30 am Session 2: Basic Load Rating Calculations 9:30 am – 9:45 am Break 9:45 am – 11:45 am Session 3: Example – Load Rating Concrete Slab Bridge 11:45 am – 12:00 pm Questions 12:00 pm – 1:00 pm Lunch 1:00 pm – 2:30 pm Session 4: Example – Load Rating Steel Beam Bridges 2:30 pm – 2:45 pm Break 2:45 pm – 3:45 pm Session 4: Example – Load Rating Steel Beam Bridges (Con’t) 3:45 pm – 4:00 pm Questions Load Rating Seminar

  3. What is Load Rating? The safe live load carrying capacity of a highway structure is called its load rating. How to calculate the rating factor (RF) A1 = Factor for dead loads A2 = Factor for live load C = Capacity of the bridge D = Dead loads I = Impact loads L = Live loads Capacity for (L+I) RF = Actual (L + I) C – A1 * D RF = A2 * (L + I) Load Rating

  4. Factors for LFR Load Rating Ref: AASHTO Manual for Condition Evaluation of Bridges 1994 Load Rating

  5. Rating Factor Equation Inventory Rating C – A1 * D R.F. = A1 = 1.3 A2 = 2.167 = 1.3 * 1.67 A2 * (L + I) C – 1.3 * D R.F. = 1.3 * 1.67 * (L + I) C/1.3 – D R.F. = 1.67 * (L + I) Load Rating Seminar

  6. Rating Factor Equation Operating Rating C – A1 * D R.F. = A1 = 1.3 A2 = 1.3 A2 * (L + I) C – 1.3 * D R.F. = 1.3 * (L + I) C/1.3 – D R.F. = (L + I) Load Rating Seminar

  7. Single-span slab bridge Load Rating

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  21. Live Load Distribution Factor AASHTO Standard Specification for Highway Bridges 3.24.3.2 CASE B – Main Reinforcement Parallel to Traffic Load Rating

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  23. Impact Load (Impact Factor) AASHTO Standard Specification for Highway Bridges 3.8.2 Impact Formula Load Rating

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  31. Summary of Rating Results POSTING NOT REQUIRED Load Rating Seminar

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  37. Material Strengths BMD - Figure 904 Load Rating Seminar

  38. Material Strengths BMD - Figure 905 Load Rating Seminar

  39. Learning Curve Load Rating

  40. ODOT Rating Contact Information • Amjad Waheed, PE614.752.9972 (awaheed@dot.state.oh.us) • Shelton A. Howard, PE614.752.9975 (showard@dot.state.oh.us) • Richard C. Irwin, PE614.752.9977 (richard.irwin@dot.state.oh.us) • Cindy Wang, PE614.466.1973 (cindy.wang@dot.state.oh.us) Load Rating

  41. That’s all folks Load Rating

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