Repair of Concrete Structures by Carbon Fiber Method

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Repair of Concrete Structures by Carbon Fiber Method. Asst. Prof Dr. Kittipoom Rodsin King Mongkuts University of Technology North Bangkok. What is FRP ?. Fiber reinforced polymer - PowerPoint PPT Presentation

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Repair of Concrete Structures by Carbon Fiber MethodAsst. Prof Dr. Kittipoom RodsinKing Mongkuts University of Technology North Bangkok

What is FRP ?Fiber reinforced polymer

3 1. (Carbon) CFRP2. (Aramid) AFRP3. (Glass) GFRP

1. 2. 3. CFRP

ROD

PLATE

SHEET

Strengthening Method

Material Properties & Design ConceptsStrainStress35000 ksc4000 kscDesign Stress Limit for CFRP(strain = 0.004) FRP

.

FRP1. FRP Sheet U2. Epoxy 3. FRP

CFRP Design Guideline

STEP 1 FRP STEP 2 FRP

STEP 3 Debonding Strain

(Dead Load Strain)

1. FRP

2. FRP Sheet U-Jacket

U-Jacket

Bonded two sides only

Vertical and Inclined Stripe

Continuous Sheet

FRP ACI440

= 0.95 full wrapped

= 0.85 U/2 sides- wrapped

FRPEffective Strain ACI Effective Strain

Full wrapped

3/2 sides-wrapped

3 sides2 sides

- (Confinement) - - - CFRP

: confinement FRP CFRP CFRP

CFRP

= 0.95

+

= 0.95

/

()

NSM bar (near surface mounted) Effective when small beam width More installation skill is needed

CFRP CFRP ACI440

1 7 34 32

34 34

FE Program

Rating Factor

CFRP Rating Factor 1