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 VEd and a normal force NEd acting over a compressive area Acc, the absolute value of the design shear stress τcp should be taken as:
|τcp = k VEd / Acc||(12.4)|
and the following should be checked: τcp ≤ fcvd where fcvd is the concrete design strength in shear and compression.
The recommended value of k is 1,5.