Exercise $2.$ Design the necessary shear reinforcement $($if required$)$ with $2-$leg stirrups for the rectangular section shown. Use f$\text{'}=210$kg$/$em and f$,=4200$kg$/$em$\text{'}.$ Propose steel with #$3$ stirrups for the loads:

a$)V_u=24,985kg$

b$)V_u=49,970kg$

c$)V_u=65,260kg$