Pth

Sc3(%)

1,75

1,75

1,75

1,75

1,90

2,1

2,2

2,3

Scu3(%)

3,5

3,5

3,5

3,1

2,9

2,7

2,6

2,6

The values for £c3u are the same as for £c2u and follow therefore from Eq. 9. An approximate expression for £c3 is

£c3 (%) = 1.75 + 0.11 (fck - 55)0.42 for fck > 55 MPa

The design stress-strain relations derived in this way are shown in Fig. 3.11.

sc3 SC3u

Figure 3.10. Bilinear design stress-strain relation g [MPa]

sc3 SC3u

Figure 3.10. Bilinear design stress-strain relation g [MPa]

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