1. Fatigue Characteristic of RC Beams Strengthen with CFRP Strand sheet
B4 Junpei Kasai

2. Today’s Topic
・Background & Purpose
・Experiment & Result
・Future plan

3. Background & Purpose Static behavior clear Fatigue behavior unclear
To make fatigue behavior clear
To analyze residual strength after 2milion fatigue load

4. Experiment & Result
Maximum load 90kN
Minimum load　10kN
・Specimen

5. Experiment & Result
Figure of Crack

6. Experiment & Result
Figure of Crack

7. Experiment & Result ・Failure model １layer Bending failure
Maximum load kN
Debonding occur at end of sheet
２layer Bending failure
　　　　　 Maximum load 260kN　
　　　Debonding occur at end of sheet

8. Experiment & Result
Load-displacement at loading point of 1 layer

9. Experiment & Result
Load-displacement at loading point of 1 2ayer

10. Experiment & Result Maximum load Static After fatigue
1layer kN kN
2layers kN kN
Enough residual strength

11. Experiment & Result
Strain of sheet

12. Experiment & Result Strain of sheet 1layer＞2layer
The number of loads increase
Strain of sheet increase
Strain of sheet
1layer＞2layer

13. Experiment & Result
Bond stress of sheet

14. Experiment & Result 1layer＞2layers Bond stress of sheet
Sheet debonding
Bond stress move

15. Future plan Static test Thank you for your kind attention !!
～　2009　Dec　24
2009 Dec 25 ～
Analysis & Thesis
Thank you for your kind attention !!