The design of members with shear reinforcement is based on a truss model (see figure below).

shear 001.png 

where

α is the angle between shear reinforcement and the beam axis, 

θ is the angle between the concrete compression strut and the beam axis perpendicular to the shear force, 

Ftd is the design value of the tensile force in the longitudinal reinforcement, 

Fcd is the design value of the compression force in the direction of the longitudinal member axis, 

bw is the minimum width between tension and compression chords, 

z is the inner lever arm. In shear analysis without axial force, the approximate value z = 0.9 d may normally be used.
 

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PRE-Stress Documentation