How to add concentrated force on curve beam?

Dear sir,

1. I want to add concentrated force on mid of curve beam, but the curve beam not support the operation. So I break the curve beam into two part, and add the force at the break node. But the bending moment of the beam is strange, is the operate of loading right? And also, I built one straight beam, and add concentrated force at mid, the bending moment is so different, what is thereason? Which way of loading is more logical?Image may be NSFW.
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