Members requiring design vertical shear reinforcement: the values of ν1 and αcw for the maximum shear resistance
Eurocode 2 part 1-1: Design of concrete structures 6.2.3 (3)
For members with vertical shear reinforcement, the shear resistance, VRd is the smaller value of:
 | (6.8) |
and:
| VRd,max = αcw bw z ν1 fcd /(cotθ + tanθ) | (6.9) |
Recommendation
Note 1: The recommended value of ν1 is ν (see Expression (6.6N) - § 6.2.2 (6)).
Note 2: If the design stress of the shear reinforcement is below 80% of the characteristic yield stress fyk, ν1 may be taken as:
| ν1 = 0,6 for fck ≤ 60 MPa | (6.10.aN) |
| ν1 = 0,9 - fck/200 > 0,5 for fck ≥ 60 MPa | (6.10.bN) |
Note 3: The recommended value of αcw is as follows:
| 1 for non-prestressed structures | |
| (1 + σcp/fcd) for 0 < σcp ≤ 0,25 fcd | (6.11.aN) |
| 1,25 for 0,25 fcd < σcp ≤ 0,5 fcd | (6.11.bN) |
| 2,5 (1 - σcp/fcd) for 0,5 fcd < σcp ≤ 1,0 fcd | (6.11.cN) |
where σcp is the mean compressive stress, measured positive, in the concrete due to the design axial force.
