Fatigue Characteristic of RC Beams Strengthen with CFRP Strand sheet
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Fatigue Characteristic of RC Beams Strengthen with CFRP Strand sheet B4 Junpei Kasai
description
Fatigue Characteristic of RC Beams Strengthen with CFRP Strand sheet. B4 Junpei Kasai. Today’s Topic. ・ Background & Purpose ・ Experiment & Result ・ Future plan. Static behavior. Background & Purpose. clear. Fatigue behavior. unclear. To make fatigue behavior clear. - PowerPoint PPT Presentation
Transcript of Fatigue Characteristic of RC Beams Strengthen with CFRP Strand sheet
Fatigue Characteristic of RC Beams Strengthen with CFRP Strand sheet
B4 Junpei Kasai
Today’s Topic
・ Background & Purpose
・ Experiment & Result
・ Future plan
Background & Purpose
Static behavior clear
Fatigue behavior unclear
To make fatigue behavior clear
To analyze residual strength after 2milion fatigue load
Experiment & Result
・ SpecimenMaximum load 90kN
Minimum load 10kN
Experiment & Result
Figure of Crack
Experiment & Result
Figure of Crack
Experiment & Result
・ Failure model１ layer Bending failure
Maximum load 250kN
Debonding occur at end of sheet ２ layer Bending failure
Maximum load 260kN
Debonding occur at end of sheet
Experiment & Result
Load-displacement at loading point of 1 layer
0
50
100
150
200
250
300
350
0 5 10 15 20
displacement mm)（
Load
KN)
（
1100
1,00010,000100,0001milion
2milionstatic
Experiment & Result
Load-displacement at loading point of 1 2ayer
0
50
100
150
200
250
300
350
0 5 10 15 20
displacement(mm)
Load
KN)
（
11001,00010,000100,0001milion2milionstatic
Experiment & Result
Maximum load
Static After fatigue
1layer 278kN 250kN
2layers 315kN 260kN
Enough residual strength
Experiment & Result
Strain of sheet1layer
0
500
1000
1500
2000
0 10 20 30 40 50 60 70
Distance from supporting point（ｃｍ）
str
ain
μ（
ｍ）
1
100
1,000
10,000
100,000
1milion
2milion
2layers
0
500
1000
1500
2000
0 10 20 30 40 50 60 70
Distance from the supporting point（ｃｍ）
str
ain
μ（
ｍ）
1
100
1,000
10,000
100,000
1milion
2milion
Experiment & Result
Strain of sheet
The number of loads increase
Strain of sheet increase
Strain of sheet
1layer ＞ 2layer
Experiment & Result
- 1.5- 1
- 0.50
0.5
11.5
22.5
0 10 20 30 40 50 60 70
Distance from the supporting point（ｃｍ）
Str
ess
N/m
m)
（
1
100
1,000
10,000
100,000
1milion
2milion
Bond stress of sheet
-2.5-2
-1.5
-1-0.5
00.5
1
1.52
2.5
0 10 20 30 40 50 60 70
Distance from the supporting point（ｃｍ）
Str
ess
N/m
m)
（
1
100
1,000
10,000
100,000
1milion
2milion
Experiment & Result
Bond stress of sheet
1layer ＞ 2layers
Sheet debonding
Bond stress move
Future plan
Static test～ 2009 Dec 242009 Dec 25 ～ Analysis & Thesis
Thank you for your kind attention !!
