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

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Presentation transcript:

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

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

CFRP C LOTH/ F ABRIC

CFRP Fabric + Resin Steel Plate (A36 Steel) Ultimate Load = 3.25 kip 1” h CFRP = ” w CFRP = lb/ft w Steel = 0.19 lb/ft ≈ 37 w CFRP h Steel = 0.056” ≈ 8.5 h CFRP CFRP Fabric vs. Steel

Task #1 Material Testing

CFRP Fabric Test Specimens

Task #2 Beam Testing

45 o Beam Strengthening

Beam Testing

Task #3 Field Application

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

Cracks Growing at an Alarming Rate SevereShearCracks

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

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

Placement of CFRP Fabric Step 1: Surface Preparation

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

Step 3: Apply Primer Placement of CFRP Fabric

Step 4: Apply Carbon Fabric Placement of CFRP Fabric

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

Task #4 Monitoring

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

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

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

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

Associated Press November, 2001

The State Journal, December, 2001

The Daily Independent November 2001

Other CFRP Projects in KY n 9 Bridges Strengthened with CFRP n 3 Bridges Strengthened With Steel FRP

Thank You and Have a Nice Day

KY