The Main shaft of a wind turbine is being redesigned. As part of the efforts, designers realized that it is necessary to calculate the deformations of the shaft that are produced by its own weight and by the weight of the flange-hub-blades assembly W. Complete the load, shear, and moment functions, using singularity functions, for the simply supported shaft. Then determine the critical points, sections, and principle stresses.

I currently have:

q(x) = -W<x-0>^-1 + R1<x-a>^-1 - W1<x-a>^0 + W1<x-b>^0 - W2<x-L>^0 + R2<x-L>^-1

as well as V(x), M(x), C1=0, C2=0, R1 and R2. I am unsure of where to go from there. ALso the shaft is made of steel.