So I have a 10 metre cantilever with a pin in the middle There is a roller at the end and a UDL of 10 kN / m acting across. Drawing the BMD is confusing me. By my calculations; there should be a 50 kN load acting at the fixed end and roller. Hence shape of the shear force diagram would be up, negative gradient and then up again. But this would make it impossible for the BMD to equal zero at the pin. Moreover when I split the cantilever at the pin, I find that the support reactions equal 25 kN now.... Where am I going wrong?