Issue 53

R. M. Reda et al., Frattura ed Integrità Strutturale, 53 (2020) 106-123; DOI: 10.3221/IGF-ESIS.53.09

Two NSM Bars

One NSM Bar

Leg             Bar             angle     Length         

Leg             Bar angle     Length     

1.60

1.60

(b)

45        0.8L 45        0.5L 45        0.25L 60        0.8L 60        0.5L 60        0.25L 90        0.8L 90        0.5L 90        0.25L

(a)

45        0.8L 45        0.5L 45        0.25L 60        0.8L 60        0.5L 60        0.25L 90        0.8L 90        0.5L 90        0.25L

1.50

1.50

1.40

1.40

1.30

1.30

P u /P u,θ=0

P u /P u,θ=0

1.20

1.20

1.10

1.10

1.00

1.00

0

50

100

150

0

50

100

150

Leg inclination length (mm)

Leg inclination length (mm)

Figure 18: The effect of end anchorage inclination angle and length on P u / P u, θ =0 for: (a) beams strengthened with one NSM bar and (b) beams strengthened with two NSM bars.

One NSM Bar

Two NSM Bars

Leg             Bar angle     Length     

Leg             Bar angle     Length     

3.00

3.00

(a)

(b)

45        0.8L 45        0.5L 45        0.25L 60        0.8L 60        0.5L 60        0.25L 90        0.8L 90        0.5L 90        0.25L

45        0.8L 45        0.5L 45        0.25L 60        0.8L 60        0.5L 60        0.25L 90        0.8L 90        0.5L 90        0.25L

2.50

2.50

2.00

2.00

1.50

Δ u /Δ u,θ=0

1.50

Δ u /Δ u,θ=0

1.00

1.00

0.50

0.50

0.00

0.00

0

50

100

150

0

50

100

150

Leg inclination length (mm)

Leg inclination length (mm)

Figure 19: The effect of end anchorage inclination angle and length on Δ u / Δ u, θ =0 for: (a) beams strengthened with one NSM bar and (b) beams strengthened with two NSM bars.

Two NSM Bars

One NSM Bar

Leg             Bar angle     Length     

Leg             Bar angle     Length     

1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10

1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10

(b)

(a)

45        0.8L 45        0.5L 45        0.25L 60        0.8L 60        0.5L 60        0.25L 90        0.8L 90        0.5L 90        0.25L

45        0.8L 45        0.5L 45        0.25L 60        0.8L 60        0.5L 60        0.25L 90        0.8L 90        0.5L 90        0.25L

E/E θ=0

E/E θ=0

0

50

100

150

0

50

100

150

Leg inclination length (mm)

Leg inclination length (mm)

Figure 20: The effect of end anchorage inclination angle and length on E / E θ =0 for: (a) beams strengthened with one NSM bar and (b) beams strengthened with two NSM bars.

100 120 140 160 180 200

100 120 140 160 180 200

100 120 140 160 180 200

(a)

(b)

(c)

0 20 40 60 80

0 20 40 60 80

0 20 40 60 80

Load, (kN)

Load, (kN)

CB 2G‐0.5‐90/50 2G‐0.5‐90/100 2G‐0.5‐90/150

CB 2G‐0.5‐90/50 2G‐0.5‐90/100 2G‐0.5‐90/150

2G‐0.5‐90/50 2G‐0.5‐90/100 2G‐0.5‐90/150

Load, (kN)

0

5

10

15

0

5

10

15

20

25

30

35

0

5

10

15

Strain, (microstrain x 10 3 )

Deflection, (mm)

Strain, (microstrain x 10 3 )

Figure 21: The effect of end anchorage length: (a) load-deflection curve, (b) steel strain and (c) FRP strain.

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