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Beam structure analysis - Dealing with angle iron loads

I am trying to complete a set of hand calculations for a structure as depicted in the attached jpg. I have done the calculations using singularity equations and assumed initial conditions to solve for the initial set of moments and shear forces at C & D however, I know there should be some axial forces @ C and D. I have looked into how to calculate that and discovered that to find the axial load, I would have to be able to calculate the shear going through the angle iron (member 1) due to the load applied to it. All the material I have found so far is really confusing and I was wondering if someone would be able to provide some assistance.