Minimum area of shear reinforcement

The minimum area of shear reinforcement in beams, Asw.min should be calculated from

Rw,min where Pwmm can be obtained from Table 9.

Figure 14

Procedure for determining longitudinal shear capacity of flanged beams

Calculate the longitudinal shear stress from: VEd = D Fd/(hf Dx) (see Figure 13)

Calculate the longitudinal shear stress from: VEd = D Fd/(hf Dx) (see Figure 13)

Determine the concrete strut capacity from Table 8

Determine the concrete strut capacity from Table 8 or from: VRd= 0.160 fck(1-fck/250)

Determine the concrete strut capacity from Table 8

Determine the concrete strut capacity from Table 8 or from: VRd= 0.160 fck(1-fck/250)

Determine Yf from:

0f = Q.5sin"1

VEd

.0.2 /ck(1- /ck/250)

Yes I (cot df ' ' = 1.25)

Table 8

Concrete strut capacity for longitudinal shear in flanged beams

fck

VRd,max

Flange in compression

Flange in tension

20

2.94

II359

25

3.60

4.39

28

3.98

4.85

30

4.22

5.15

32

4.46

5.44

35

4.82

5.87

40

5.38

6.55

45

5.90

7.20

50

6.40

Values for Rw,min

Table 9

Values for Rw,min

fck

20

25

28

30

32

35

40

45

50

Rw,minXl0-3

0.72

0.80

0.85

0.88

0.91

0.95

1.01

1.07

1.13

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