I am having one shaft which is supported in two positions and it is loaded with a remote load. The problem that I have is when I am simulating the shaft using fixed hinge fixture the reaction forces on the supporting faces are different from the case that I am using bearing fixture and I cannot understand why this happening. Also when I am using bearing fixture the reaction force is zero and I can have only the free body forces. If I will allow alignment for the bearing fixture then I have reaction forces but also I have reaction moment which is not correct. With the hinge fixture I have both reaction and free body forces which are the same magnitude both, but different with the forces of bearing fixture. I want to know which is the right fixture. Can somebody give me a help about this.