Verification of Crack Width
Crack width is evaluated according to chapter 7.3.4 of standard.
First, the maximal tension stress in concrete is calculated at the ideal section. If the stress is less than concrete tension strength fctm than cracks don't develop.
If not fulfilled then the crack width is determined according to:
where σs is stress in tensile reinforcement determined at the ideal section with crack
If the distance of the reinforcement bar is less or equal than 5(c+ϕ/2):
reinforcement bar diameter
If the distance of reinforcement bars is greater than 5(c+ϕ/2):