1. You want to get the reaction force and moment on the structure. To do this you can do a probe of the boundary condition and find out the values.
2. You want to know the relationship between principal stress and "tension stress". The principal stress does not have to be one positive(tension) or negative(compression). If you plot the Mohr's circle you will find out.
3. For members with bending, you can see a stress variation in the member and you can find high bending members by checking that, for example, the following image shows a contour plot of principal max stress.