LOAD RATING BY MANUAL CALCULATIONS
LOAD RATING BY MANUALCALCULATIONSRC SLAB BRIDGE RATINGAmjad Waheed, PEOhio Department of TransportationLoad Rating1
Agenda – Day 18:00 am – 8:15 am8:15 am – 8:45 am8:45 am – 9:30 am9:30 am – 9:45 am9:45 am – 11:45 am11:45 am – 12:00 pm12:00 pm – 1:00 pm1:00 pm – 2:30 pmBeam2:30 pm – 2:45 pm2:45 pm – 3:45 pmBeam3:45 pm – 4:00 pmIntroductions and House KeepingSession 1: Load Rating BasicsSession 2: Basic Load RatingCalculationsBreakSession 3: Example – Load RatingConcrete Slab BridgeQuestionsLunchSession 4: Example – Load Rating SteelBridgesBreakSession 4: Example – Load Rating SteelBridges (Con’t)QuestionsLoad Rating Seminar2
What is Load Rating?The safe live load carrying capacity of a highwaystructure is called its load rating.How to calculate therating factor (RF)Capacity for (L I)RF RF A1 Factor for dead loadsA2 Factor for live loadC Capacity of the bridgeActual (L I)D Dead loadsC – A1 * DI Impact loadsA2 * (L I)L Live loadsLoad Rating3
Factors for LFR Load RatingRating Type A1 Factor forInventory* Design levelOperatingdead loads1.31.3A2 Factor forlive load2.171.3Ref: AASHTO Manual for Condition Evaluation of Bridges 1994Load Rating4
Rating Factor EquationInventory RatingR.F. C – A1 * DA2 * (L I)A1 1.3A2 2.167 1.3 * 1.67C – 1.3 * DR.F. 1.3 * 1.67 * (L I)C/1.3 – DR.F. 1.67 * (L I)Load Rating Seminar5
Rating Factor EquationOperating RatingR.F. C – A1 * DA2 * (L I)A1 1.3A2 1.3C – 1.3 * DR.F. 1.3 * (L I)C/1.3 – DR.F. (L I)Load Rating Seminar6
Single--span slab bridgeSingleLoad Rating7
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Live Load Distribution FactorAASHTO Standard Specification for Highway Bridges3.24.3.2 CASE B – Main Reinforcement Parallel to TrafficFor wheel loads, thedistribution widthE 4 0.06*S 7’E 4 0.06*13 4.78’S Effective Spanlength in feet3.24.1S 13’Load Rating21
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Impact Load (Impact Factor)AASHTO Standard Specification for Highway Bridges3.8.2 Impact FormulaThe amount of impact allowance,I, as a fraction of the live loadI 50 / (L 125) 0.3I 50 / (13 125) 0.362Load RatingL Effective Spanlength in feetUse I 0.323
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Summary of Rating ResultsPOSTINGLoad Weight(GVW)TonsHS 20362F1153F1234F1275C140M L Ift. k/ft14.138.8310.7310.9410.73R.F. Safe LoadTons(28.09/M L I)1.988723.181482.618622.569692.618108% OhioLegal----318%262%257%262%POSTING NOT REQUIREDLoad Rating Seminar31
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Material StrengthsBMD - Figure 904Load Rating Seminar37
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DeteriorationLoad Rating39
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2F1 15 8.83 3.181 48 318% 3F1 23 10.73 2.618 62 262% 4F1 27 10.94 2.569 69 257% 5C1 40 10.73 2.618 108 262% POSTING NOT REQUIRED. Load Rating 32. Load Rating 33. Load Rating Seminar 34. Load Rating Seminar 35. Load Rating Seminar 36. Material Strengths Lo
Part II - Branch-Circuit Load Calculations (221.10 - 221.18) Part III - Feeder/Service Load Calculations (221.40 - 221.61) Part IV - Optional Feeder/Servi ce Load Calculations (221.80 - 221.88) Part V - Farm Load Calculations(221.100 - 221.103) 220.40 - General The calculated load of a feeder or service shall not be less than
Manual for Bridge Evaluation and Section 27.1. All load ratings will be independently reviewed for reasonableness and general conformity with the state's load rating practices. On the Load Rating Summary Sheet, the reviewer will note "Reviewed for Conformity" and sign each load rating reviewed.
1.3.2 Determination of guideway and cage lengths 17 1.3.3 Hole 18types and hole patterns 1.3.4 End pieces 20and wipers 1.3.5 Load rating, load carrying capacity 21 Basic1.3.5.1 static load rating 21 1.3.5.2 Static 21load carrying capacity 1.3.5.3 Basic 22dynamic load rating 1.3.5.4 Dynamic load carrying capacity 22and rating life
turning radius speed drawbar gradeability under mast with load center wheelbase load length minimum outside travel lifting lowering pull-max @ 1 mph (1.6 km/h) with load without load with load without load with load without load with load without load 11.8 in 12.6 in 347 in 201 in 16 mp
Floor Joist Spans 35 – 47 Floor Joist Bridging and Bracing Requirements 35 Joist Bridging Detail 35 10 psf Dead Load and 20 psf Live Load 36 – 37 10 psf Dead Load and 30 psf Live Load 38 – 39 10 psf Dead Load and 40 psf Live Load 40 – 41 10 psf Dead Load and 50 psf Live Load 42 – 43 15 psf Dead Load and 125 psf Live Load 44 – 45
1. Load on the front axle (kg) 2. Maximum front axle weight 3. Load curve for the front axle 4. Load curve for the rear axle 5. Highest load on front axle when unloading 6. Show how the vehicle is unloaded from the rear 7. Load on the rear axle (kg) 8. The size of the load as a percentage of the maximum load F (kg) R (kg) 9 000 8 000 7 000 6 .
1. Rating Analysis 2. Financial Information 3. Rating Scale 4. Regulatory and Supplementary Disclosure Rating History Dissemination Date Long Term Rating Short Term Rating Outlook Action Rating Watch 08-May-2021 AA A1 Stable Maintain - 16-May-2020 AA A1 Stable Maintain - 15-Nov-2019 AA A1 Stable Maintain - 17-May-2019 AA A1 Stable Maintain -
Kindergarten Writing Curriculum Pacing Guide Content Area: Writing-Language Arts Grade Level: Kindergarten Building a Talking Community: Oral Language September Unit 1: Launch Writing October-November Unit 2: Writers are Readers December-January Unit 3: How-To Books February-March Unit 4: Persuasive Writing April-June
