![Page 1: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/1.jpg)
Shear Repair of P/C Box Beams using CFRP Fabric
KYDOT
July 27, 2011Salt Lake City, Utah
Kentucky Transportation Cabinet Kentucky Transportation Center University of Kentucky
RAC/TRB Summer Meeting
![Page 2: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/2.jpg)
Objective Retrofit P/C Spread Box Beams using carbon fiber
reinforced polymer (CFRP) fabric to increase Shear
Capacity
![Page 3: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/3.jpg)
CFRP CLOTH/FABRIC
![Page 4: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/4.jpg)
CFRP Fabric
+ Resin
Steel Plate
(A36 Steel)
Ultimate Load = 3.25 kip
1”1”
hCFRP = 0.0066”
wCFRP = 0.0051 lb/ft wSteel = 0.19 lb/ft ≈ 37 wCFRP
hSteel = 0.056”
≈ 8.5 hCFRP
CFRP Fabric vs. Steel
![Page 5: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/5.jpg)
Task #1
Material Testing
![Page 6: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/6.jpg)
CFRP Fabric Test Specimens
![Page 7: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/7.jpg)
Task #2
Beam Testing
![Page 8: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/8.jpg)
45o
Beam Strengthening
![Page 9: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/9.jpg)
Beam Testing
![Page 10: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/10.jpg)
Beam Testing
![Page 11: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/11.jpg)
Task #3Field Application
![Page 12: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/12.jpg)
Bridge on KY 3297 over Little Sandy RiverCarter County, Kentucky
Shear Cracks inP/C Box Beams
![Page 13: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/13.jpg)
Cracks Growing at an Alarming Rate
SevereShear
Cracks
![Page 14: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/14.jpg)
Original Solution
Replace the Superstructure - Cost: ~ $600,000 - Close Bridge to Traffic
![Page 15: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/15.jpg)
Alternate Solution Use CFRP Fabric - Cost: $105,000 (Design, Repair, and 3-years Monitoring) - Bridge Remains Open to Traffic
![Page 16: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/16.jpg)
Placement of CFRP FabricStep 1:Surface
Preparation
![Page 17: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/17.jpg)
Placement of CFRP FabricStep 2:
Crack Injection and Filling of Voids
![Page 18: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/18.jpg)
Step 3:Apply Primer
Placement of CFRP Fabric
![Page 19: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/19.jpg)
Step 4:Apply Carbon
Fabric
Placement of CFRP Fabric
![Page 20: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/20.jpg)
Step 5:CFRP Fabric on Outside Face Painted to Match Concrete Color
Placement of CFRP Fabric
![Page 21: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/21.jpg)
Task #4Monitoring
![Page 22: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/22.jpg)
Scaffolding Used for Monthly Bridge Monitoring
Bridge Monitoring (10/01 to 12/06)
![Page 23: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/23.jpg)
CFRP Fabric on Inside Faces of the Beams Was Not Painted to
Match Concrete Color
Crack Monitor
![Page 24: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/24.jpg)
No Crack Movement Since Repair Was Completed in October 2001
Crack Monitor on Inside Beam Face
![Page 25: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/25.jpg)
- 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
Conclusion
!!!!! HURRAY !!!!!!
![Page 26: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/26.jpg)
Associated Press November, 2001
![Page 27: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/27.jpg)
The State Journal, December, 2001
![Page 28: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/28.jpg)
The Daily Independent
November 2001
![Page 29: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/29.jpg)
Other CFRP Projects in KY 9 Bridges Strengthened with CFRP 3 Bridges Strengthened With Steel FRP
![Page 30: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/30.jpg)
Thank Youand
Have a Nice Day
![Page 31: Shear Repair of P/C Box Beams using CFRP Fabric KYDOT](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815f6a550346895dce6d6f/html5/thumbnails/31.jpg)
KY