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
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