I have modeled a simply supported beam with several members. Why are the signs of the shear force diagram partially incorrect?


There is very likely no uniform member orientation, see Figure 01.

Figure 01 - Shear Force Diagram Without Uniform Member Orientation

As soon as the member orientation is uniform (right-click on the member → "Reverse Member Orientation"), the signs of the shear force diagram also match, see Figure 02.

Figure 02 - Shear Force Diagram with Uniform Member Orientation


Shear force Sign Shear force diagram Member orientation


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