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Superload Move

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

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Superload Move

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

  2. Superload - Route

  3. 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

  4. 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)

  5. Superload - Permit

  6. Superload - Permit

  7. Superload - Jump

  8. Superload - Restrictions

  9. Superload - Crabs

  10. Superload

  11. Superload

  12. 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

  13. Superload • Bridge Fed ID: 24505

  14. Superload Bridge Fed ID:24505 Wheel Configuration: Straight

  15. Superload • Bridge Fed ID: 25334

  16. Superload Bridge Fed ID:25334 Wheel Configuration: Straight

  17. Superload • Bridge 24231

  18. Superload Bridge Fed ID:24231 Wheel Configuration: Straight

  19. Superload 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.

  20. Superload

  21. Superload • http://www.youtube.com/watch?v=Dmacnt5GaHw • http://www.youtube.com/watch?v=v8_3uyecXSc

  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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