Given, factored (ultimate) design shear force, Vu=150kN
Also, ultimate shear capacity of concrete,
Vuc=τcbd
=0.56×250×450N=63kN
∴ Ultimate shear force to be resisted by shear reinforcement,
Vus=Vu−Vuc
=150−63=87kN
For vertical stirrups, spacing is given as
Sv=0.87fyASDdVus
=0.87×250×2×π4×102×45087×103=176.71mm