Cover to Reinforcement (Concrete wall: EC2)
For 1 layer of reinforcement, the vertical bar is on the centre-line of the wall thickness, the face of the horizontal bar is closest to the critical concrete face.
For 2 layers of reinforcement, the horizontal bars are placed outside the vertical bars at each face.
The nominal concrete cover is measured to the face of the horizontal bar or any link/confinement transverse reinforcement that may be present.
You are required to set a minimum value for the nominal cover, cnom, for each wall in the wall properties.
These values are then checked against the nominal limiting cover, cnom,lim which depends on the diameter of the reinforcement plus an allowance for deviation, Δcdev (specified in Design Settings > Concrete > Cast-in-place > Wall > General Parameters).
Generally, the allowance for deviation, Δcdev is a NDP. 1 The recommended value is 10mm, but under strict controls it can be reduced to 5mm.
If cnom < cnom,lim then a warning is displayed in the calculations.
Footnotes
1 EN 1992-1-1:2004 cl 4.4.1.3 (1)P