RAM Structural System Drag Strut Modelling

Hi,

Is there a way to model drag struts in RAM Structural System that would break up the diaphragm forces? I am not concerned so much about design of the strut but more so the distribution of the forces into the lateral system (perimeter precast concrete shear walls). 

I am analyzing an existing building - where the diaphragm will be going from a flexible condition to a semi-rigid (untopped metal roof deck). With flexible, the program allows you to control the % distribution into the lateral system. For a semi-rigid diaphragm, it will distribute the forces depending on the stiffness of the system/diaphragm. Does the program take into account the drag strut essentially breaking up the roof diaphragm? Do you have any recommendations how to properly model/run it to take the drag struts into consideration?

Thanks,

Michael Bui

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