Superload Move April 06, 2013 Prasad Nallapaneni & Jonathan Mallard Structure and Bridge, VDOT

Superload - Route 2

Superload- Details Total Distance : Approximately 96 Miles Number of Structures: 62 (61 VDOT) Bridges: 25 Culverts: 37 VDOT Structures: Analyzed in-house: 47 Third Party Analysis: 16 3

Superload - Detials Analysis Method: In house: LFR/LRFR – »VIRTIS if available »Compared Simple span moments with HS20 ratings Third Party:LRFR -16 Bridges Verified hand calculations / LFR analysis Structures Jumped: 5 (five) 4

Superload - Permit 5

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Superload - Jump 7

Superload - Restrictions 8

Superload - Crabs 9

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Superload Attempt Made: Run few bridges in 6.5 with Non Standard Gage Vehicle Compare with calculations received from Third Party and in-house STAAD runs 12

Superload Bridge Fed ID:

Superload BrR Model Hand Clacs % DiffReason Dead Load Moment (K ft) % Model has slightly higher Superimposed loads Capacity (K Ft) %Round of error Rating Factor % Live Load (K ft) % May be round off error in Distribution Factor. No detail output in BrR for Live Load. 14 Bridge Fed ID: Wheel Configuration: Straight

Superload Bridge Fed ID:

Superload BrR Model Hand Clacs % DiffReason Dead Load Moment (K ft) % Round Off Capacity (K Ft) % Round Off Rating Factor % Live Load (K ft) % May be round off error in Distribution Factor. No detail output in BrR for Live Load. 16 Bridge Fed ID: Wheel Configuration: Straight

Superload Bridge

Superload BrR Model Hand Clacs % DiffReason Dead Load Moment (K ft) % Capacity (K Ft) % Rating Factor % Live Load (K ft) % May be round off error in Distribution Factor. No detail output in BrR for Live Load. 18 Bridge Fed ID: Wheel Configuration: Straight

Superload 19 Difficulties 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 5GaHw ecXSc 21

22 Field Operations Field 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.

23 Field Operations Structure 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.

24 Field Operations Structure 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.

25 Field Operations Structure 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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