1 2 3 4

1 185-8540 2-8-38E-mail:oyado@rtri.or.jp

2 305-8573 1-1-1E-mail:kanakubo@kz.tsukuba.ac.jp

3 305-8573 1-1-1E-mail:yamamoto@kz.tsukuba.ac.jp

4 185-8540 2-8-38E-mail:ben@rtri.or.jp

13

3D

Key Words : corrosion, bending, static loading, percentage weight loss, ultimate strength

1.

19801),2)

2)

3)

(1)

C = w/w (1)

C ww

土木学会論文集Ｅ Vol.62 No.3, 542-554, 2006. 8

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Puc / Pun 1 k C (2)

Puc Pun

k C

4)

5),6),7)

k

2.

(1)a)

S,M C 2

85),6),7)

8)

17 3%1 3

20

50mm 5kg/m3

8 S20 M 12

NaCl

0.02 0.103) 9)

5

9)

*

(kg/m3)

(%) NaCl

AE

(C %)S,M 50 165 245 932 953 10

C 45 164 252 833 1049 10 0.25 * =24N/mm2 =8 2.5cm

=4 1% =65%** NaCl

5) 20 5) 12 6), 7)

S-0N SD-1N, SD-2N, SD-3N, SD-4S

M1,M2,M3

(0) (0.35) (0.84) (1.33)C1 C2 C3 C4, C5

M1, M2, M3 6), 7) C, B, A ( ) (A h/cm2)

8)

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10)

50%

b)

M

SC

M50 100mm 11)

C

JCI SC1

(1) wC

S,M

(2) a)

C2C1 M2

C2

C1

M2 C2

S C

S-0N SD-1N,2N,3N SD-4S 21.7 23.2 29.7 C1 C2 C3 C4,C5 29.8 30.8 42.3 34.3

N/mm2

6) M

M3 19700 28.5 77.2 27.6 M2 31800 42.4 45.1 40.2 M1 31800 38.6 51.2 36.8

11)

V VV V

N/mm2

C

(N/mm2) (kN/mm2) (N/mm2) ( )D13* 366 195 433 26.0 D6* 355** 193 417 26.3

* D13 D6** 0.2%

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M3 7)

P=22kN sb

sa sc

b)P

6),7)

C4 C5

C4 C5

C5C4

M3

12)

(a)

(a) (b)

2,3

P2 P3 2 3

P P

P3 2P2 3 P3

P2

23

0 20 40 60 800

20

40

60

M1

M2

M3

(mm)

P(kN

)

0 20 40 60 800

20

40

60C1( )

C2 C3

C4

C5

(mm)

P(kN

)

0

10

20

30

40

0.0 0.5 1.0 1.5 2.0

P(k

N)

7) M3

6),7)

M3

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C

(Puc

/ P u

n)

13)

14)

(P uc/P un )= 1.21C +1 R 2 =0.46

P3

P2 P3

C4 M3 P2 P3

(b) M3 P3

P2 P3

P2 P3

Pu

C Puc

Pun

CM

700mm

C2 C5

Pu C(kN)

*mode

C1 50.6 1.00 0.00 - 1 C2 43.0 0.85 0.21 0.20 0.22 1

C3 42.7 0.84 0.10 0.10 0.11 1 C4 36.2 0.72 0.24 0.22 0.26 3 C5 8.7 0.17 0.44 0.37 0.50 4

M1 6),7) 36.4 0.72 0.14 0.13 0.14 0.16 2 M2 6),7) 40.5 0.80 0.13 0.13 0.13 0.12 0.15 1 M3 6),7) 42.2 0.83 0.11 0.10 0.11 0.12 0.12 2

S-0N 5) 52.5 1.00 0.00 - 1 SD-1N 5) 47.1 0.90 0.02 0.00 0.03 1 SD-2N 5) 45.6 0.87 0.04 0.03 0.04 1

SD-3N 5) 48.1 0.92 0.01 0.00 0.03 1 SD-4N 5) 49.5 0.94 0.02 0.02 0.02 1

*mode1234

S-0NC1

(2)k 1.64

C51.35 1

k 1.97k

13),14)

C5

0 0.3

13)

14)

C

C

(Puc

P un)

(P uc /P un)= 1.97C +1 R 2=0.69

(P uc /P un)= 1.35C +1 R 2=0.40(P uc /P un)= 1.64C +1 R 2=0.83

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C

fsuc

f sun

C =0.35

(f suc /f sun )= 1.35C +1 R 2=0.79

C<0.35 (f suc /f sun )= 1.24C +1 R 2=0.14

8)

9)

1k 1.21

fsun

fsuc8) 9)

(Puc / Pun ) ( fsuc / fsun) k1.35 1

C0.35

k 1

kk

kk

k 3)

10)

k

k 1

15)

k=1 k

15) D16

D13 15)

15)

15)

128 mm

15)

k 1

C k

3) 10)

1.41 1.34 1.35 2.17 1.171.97 1.59 1.64

C<0.35

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3.

(1)

10),16)

3D3D

z

x,y

400mm 1mm20

:600 700nm:1.0mW:350 s

:2857Hz0.2 600.2 406.4mm

254mm 406.4mm

(2)3D

L d

3D

3D

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L d

1%

3D(b) 196.4mm2

(c) 178.9mm2

3D 0.91D10

3D

3D

3D

3D0.91

(3)3D

19)

10)

1mm 13D

d

L

3D

(a) D13 3D

(b) (D16) (c) (D16)

No. C,L1 D13 0,70

2 D130.15,150 (M2)

3 D130.12,360

9)

4 D130.40,360 (C5)

5 D160.39,250 ( *) 10)

6 D10 -,270 C L (mm) -*

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No.5No.1

No.2

No.3,4No.2

No.6

No.5

D13 No.1 No.4

No.2

No.3 No.2No.3

No.2

No.3 4No.4

C2 (3)

C2=(An Ac)/An (3)

An Ac

A Am

n c

An=121.0 n=8.2

Amn=113.4

Ac=100.1 c=8.1

Amc=86.5

Ac=99.3 c=5.5

Amc=84.6

Ac=70.7 c=18.1

Amc=24.3

No.5 10)

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Am Amc/Amn

Amc

Amn

C2 Amc/Amn

(Puc/Pun) (Amc/Amn) C C2

k 1.761.8

No.3

No.2

4.

(1)3D

iP i

= f ( ) Ai

i = P/Ai = f ( i)i = f -1 ( i) (4)

LL i Li

L L

L = i Li (5)

D16

No.2,3

C2 Amc /Amn

100mm15mm

A0.85AC 2

(Am

c / A

mn)

(A mc /A mn)= 1.76C 2+ 1R 2= 0.97(Amc/Amn)= 1.76C2+1R2=0.97

C2

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240 260 280 300 320 340 3600

50

100

150

200

250

(mm)

(mm

2 )

0 2.0 4.0 6.0 8.00

20

40

60

80

100

EXPCAL2.TXD16-C1.PRN

L(mm)

P(kN

)

(63kN)

( )(53kN)

124(mm2) =53(kN)148(mm2) =63(kN)

=425(N/mm2)

50 100 150 200 250 300 35040

60

80

100

120

140

(mm)

(mm

2 )

0 2.0 4.0 6.0 8.00

20

40

60

80

100

D16-C1.PRNEXPCA

L(mm)

P(kN

)15 20%

15%85%

148.5125.0mm2 0.84

16

= f ( )

3D1mm

(2)

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0 0.02 0.04 0.06 0.08 0.100

100200300400500600

(N/m

m2 )

6.TXT6.TXT6.TXT{

P/2

- No.3

- -

eM

-M –

M

C3

5.

3D

1)

V-86 pp.171-172

1981.

2) RC

6

pp.177-180 1984.

3)

pp.43-74

1998.

4)

RC

Vol.40 No.3 pp.53-58 2002.

5) RC

Vol.12 No.1 pp.557-562 1990. P

M-

M

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6)

Vol.23 No.3 pp.1315-

1320 2001.

7)

55

V-360 pp.722-723 2000.

8)

RC

Vol.24 No.1 pp.783-788 2002.

9)

Vol.24 No.2 pp.961-966 2002.

10)

55

V-358 pp.718-719 2000.

11)

473 pp.19-28 1995.

12)

Vol.17 No.1 pp.877-882 1995.

13)

RC

Vol.12 No.1 pp.563-568 1990.

14)

RC

pp.87-92 1996.

15) RC

Vol.24 No.2 pp.1501-1506 2002.

16)

Vol.23 No.3 pp.1327-1332 2001.

INFLUENCE OF CORROSION OF REINFORCING BARS ON BENDING PERFORMANCE OF REINFORCED CONCRETE MEMBERS

Michiaki OYADO, Toshiyuki KANAKUBO, Yasuhiko YAMAMOTO and Tsutomu SATO

This paper studied about the influence of corrosion of reinforcing bars on bending performance of reinforced concrete (RC) members in order to serve for maintenance of RC strucutures. Bending tests on corroded RC members and 3 dimensional shape scanning of the corroded reinforcing bars were carried out. It was proved that tensile strength of reinforcing bars and ultimate strength of RC members were decreased by not only the weight loss (which means the averaged reduction of cross section) of the reinforcing bar but also the localized corrosion. It was also clarified that the localized corrosion of reinforcing bars had effect on the stress-strain relationships of reinforcing bars around the yield point.

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