fatigue study with screws

Dear SolidWorks Simulation group:

I have an assembly with two parts. These two parts are screwedtogether using two screws. One of the parts is under load.

So, I did a stress analysis with 2 bolts (with torque specified)and the load. The problem is in Fatigue analysis, how do I specifyload ration just for the load and keep the bolt torque constant? Ibelieve that, when I specified loading ratio, it applies to all theload, ie, the load + two torque on the bolts.

Any suggestion?

Pei-YingSolidworksSimulation