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Shear Repair of P/C Box Beams using CFRP Fabric KYDOT

July 27, 2011 Salt Lake City, Utah. RAC/TRB Summer Meeting. Shear Repair of P/C Box Beams using CFRP Fabric KYDOT. Kentucky Transportation Center University of Kentucky. Kentucky Transportation Cabinet. Objective.

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Shear Repair of P/C Box Beams using CFRP Fabric KYDOT

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  1. July 27, 2011 Salt Lake City, Utah RAC/TRB Summer Meeting Shear Repair of P/C Box Beams using CFRP FabricKYDOT Kentucky Transportation Center University of Kentucky Kentucky Transportation Cabinet

  2. Objective Retrofit P/C Spread Box Beams using carbon fiber reinforced polymer (CFRP) fabric to increase Shear Capacity

  3. CFRPCLOTH/FABRIC

  4. CFRP Fabric vs. Steel wCFRP = 0.0051 lb/ft wSteel = 0.19 lb/ft ≈ 37 wCFRP Steel Plate (A36 Steel) hCFRP = 0.0066” CFRP Fabric + Resin hSteel= 0.056” ≈ 8.5 hCFRP 1” 1” Ultimate Load = 3.25 kip

  5. Task #1 Material Testing

  6. CFRP Fabric Test Specimens

  7. Task #2 Beam Testing

  8. Beam Strengthening 45o

  9. Beam Testing

  10. Beam Testing

  11. Task #3 Field Application

  12. Bridge on KY 3297 over Little Sandy River Carter County, Kentucky Shear Cracks in P/C Box Beams

  13. Severe Shear Cracks Cracks Growing at an Alarming Rate

  14. Original Solution Replace the Superstructure - Cost: ~ $600,000 - Close Bridge to Traffic

  15. Alternate Solution Use CFRP Fabric - Cost: $105,000(Design, Repair, and 3-years Monitoring) - Bridge Remains Open to Traffic

  16. Placement of CFRP Fabric Step 1: Surface Preparation

  17. Placement of CFRP Fabric Step 2: Crack Injection and Filling of Voids

  18. Placement of CFRP Fabric Step 3: Apply Primer

  19. Placement of CFRP Fabric Step 4: Apply Carbon Fabric

  20. Placement of CFRP Fabric Step 5: CFRP Fabric on Outside Face Painted to Match Concrete Color

  21. Task #4 Monitoring

  22. Bridge Monitoring (10/01 to 12/06) Scaffolding Used for Monthly Bridge Monitoring

  23. CFRP Fabric on Inside Faces of the Beams Was Not Painted to Match Concrete Color Crack Monitor

  24. Crack Monitor on Inside Beam Face No Crack Movement Since Repair Was Completed in October 2001

  25. Conclusion Cost Effective: $105,000 for Repair vs. $600,000 for Replacement- Repair is Effective: No Crack Movement Since Repair was Completed in October 2001- No Detour- No Traffic Control- No Traffic Disruption !!!!! HURRAY !!!!!!

  26. Associated PressNovember, 2001

  27. The State Journal, December, 2001

  28. The Daily Independent November 2001

  29. Other CFRP Projects in KY • 9 Bridges Strengthened with CFRP • 3 Bridges Strengthened With Steel FRP

  30. Thank Youand Have a Nice Day

  31. KY

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