A 6m long simply supported beam is carrying a factored concentrated load of 500 kN acting at midspan and factored uniformly distributed load of 6.921 kN/m. The beam is 300mm wide and has a total depth of 700mm. It is reinforced at the bottom side with 3 - 32mm diameter bars. Compressive strength of concrete is 27.60 MPa. Tensile strength of bars is 276 MPa and steel covering up to tensile reinforcement is 70mm. Required:
a. Shear strength provided by the concrete using detailed calculation b. Spacing of stirrups if the diameter of the stirrups is 10mm.