# Shear stress for a section of plain concrete member: the value of `k`

## Eurocode 2 part 1-1: Design of concrete structures 12.6.3 (2)

In plain concrete members, for a section subject to a shear force `V _{Ed}` and a normal force

`N`acting over a compressive area

_{Ed}`A`, the absolute value of the design shear stress

_{cc}`τ`should be taken as:

_{cp} τ = _{cp}k V / _{Ed}A _{cc} | (12.4) |

and the following should be checked: `τ _{cp}` ≤

`f`where

_{cvd}`f`is the concrete design strength in shear and compression.

_{cvd}## Recommendation

The recommended value of `k` is 1,5.