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Table 2 Mechanical properties of tendons, auxiliary bonded reinforcement and stirrup.

From: Balanced Ratio of Concrete Beams Internally Prestressed with Unbonded CFRP Tendons

Types

Diameter (mm)

Effective area (mm2)

CFRP

Steel

f pfm or f bfm

(MPa)

E pf or E bf

(MPa)

É› pfm or É› bfm

(%)

f y

(MPa)

Tendons

CFCC

7.5

30.4

1880

144,000

1.30

–

10.5

55.7

1880

144,000

1.30

–

15.2

113.6

1750

135,000

1.30

–

DWC

9.5

70.9

2500

135,000

1.85

–

Auxiliary bars

DWC

6.0

28.3

2200

139,000

1.58

–

Steel

6.0

31.6

–

–

–

420

Stirrups

DWC

6.0

28.3

2200

139,000

1.58

–

Steel

6.0

31.6

–

–

–

420

  1. f pfm : tensile strength of CFRP tendons (MPa); f bfm : tensile strength of non-prestressed auxiliary bonded reinforcements (MPa).