A 9m span simply supported beam AB supports a train of point loads as shown below.
The maximum positive shear force at one-third span from end 'A' is
Let us first of all draw ILD for shear at one-third span from end A.
For the SF to be maximum positive, the trailing load 50 kN should be placed at ‘C’.
∴(VC)max=50×23+20×49+10×2.59=45 kN