Determination stirrups around section

 

The stirrups around section are taking into account on a length corresponding to horizontal projection of a length of compression strut (the width of concrete strut), which can be calculated according to formula

δ = z ∙ cot θ

where

z	is inner lever arm of cross-section , see "Inner lever arm for shear check"
θ	Angle between concrete compression strut and beam axis perpendicular to the shear force, see "Angle between concrete compression strut and beam axis"