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Superload Move. April 06, 2013 Prasad Nallapaneni & Jonathan Mallard Structure and Bridge, VDOT. Superload - Route. Superload - Details. Total Distance : Approximately 96 Miles Number of Structures: 62 (61 VDOT) Bridges: 25 Culverts: 37 VDOT Structures: Analyzed in-house: 47 - PowerPoint PPT Presentation
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Superload MoveApril 06, 2013Prasad Nallapaneni & Jonathan MallardStructure and Bridge, VDOT
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Superload - Route
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Superload- DetailsTotal Distance :
Approximately 96 Miles Number of Structures: 62 (61 VDOT)
Bridges: 25Culverts: 37
VDOT Structures:Analyzed in-house: 47Third Party Analysis: 16
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Superload - DetialsAnalysis Method:
In house: LFR/LRFR – »VIRTIS if available»Compared Simple span moments with HS20 ratings
Third Party: LRFR -16 BridgesVerified hand calculations/ LFR analysis
Structures Jumped: 5 (five)
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Superload - Permit
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Superload - Permit
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Superload - Jump
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Superload - Restrictions
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Superload - Crabs
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Superload
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Superload
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SuperloadAttempt Made:
• Run few bridges in 6.5 with Non Standard Gage Vehicle
• Compare with calculations received from Third Party and in-house STAAD runs
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SuperloadBridge Fed ID: 24505
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Superload
BrR Model Hand Clacs % Diff Reason
Dead Load Moment (K ft) 1550 1519 2.04% Model has slightly higher
Superimposed loadsCapacity (K Ft) 6271 6221 0.80% Round of errorRating Factor 2.01 2.09 -4.22%
Live Load (K ft) 2355 2246 4.83%
May be round off error in Distribution Factor. No detail output in BrR for
Live Load.
Bridge Fed ID: 24505Wheel Configuration: Straight
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SuperloadBridge Fed ID: 25334
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Superload
BrR Model Hand Clacs % Diff Reason
Dead Load Moment (K ft) 5701 5691 0.18% Round Off
Capacity (K Ft) 15475 15463 0.08% Round OffRating Factor 1.11 1.19 -6.48%
Live Load (K ft) 8805 8233 6.95%
May be round off error in Distribution Factor. No detail output in BrR for
Live Load.
Bridge Fed ID: 25334Wheel Configuration: Straight
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SuperloadBridge 24231
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Superload
BrR Model Hand Clacs % Diff Reason
Dead Load Moment (K ft) 320 320 0.0%
Capacity (K Ft) 1828 1828 0.08%Rating Factor 2.07 2.19 -5.6%
Live Load (K ft) 729 688 5.93%
May be round off error in Distribution Factor. No detail output in BrR for
Live Load.
Bridge Fed ID: 24231Wheel Configuration: Straight
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SuperloadDifficulties Faced
• Installation issues with 64 vs. 32 bit• Long time run process• Memory issues• Run only from bridge explorer • Not able to get a detailed LL output.
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Superload
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Superloadhttp://www.youtube.com/watch?v=Dmacnt5GaHw http://www.youtube.com/watch?v=v8_3uyecXSc
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Field OperationsField Surveys• LIDAR survey was taken before and after on 5 long
span structures.• Calculated LL deflections from vehicle were up to 6”• Survey showed before and after elevations of the
bridge deck surface and the bottoms of the girders were within the tolerance of the method used.
• Any post move deflection was undetectable from a survey perspective.
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Field OperationsStructure 10720, Lee County• Originally designated to be ‘jumped’• Field review of route raised concerns about limited
hospital access for an extended period.• Detour length = 50 miles.• Hauler’s consultants recommended removing a 20 kip
counterweight from each of the tractors.• Tractors effectiveness was limited due to traction
loss.
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Field OperationsStructure 24362, Norton• Rated by private consultant. Substructure controlled
at pier due to uneven span arrangement• Travel restrictions were issued. • During transport, hydraulic line broke while crossing
the structure. Lead tractor was over critical pier.• After line replacement, vehicle initiated movement
from rear tractor, which was not on bridge.
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Field OperationsStructure 22454, Norton• Simple Span Plate Girder with partial depth welded
diaphragms• First diaphragm on girder 4 cracked at the base.• Retrofitted by drilling, arrested by next inspection
cycle.
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