CMU and CFMF shear walls in RAM SS

I am trying to analyze a building with CMU and CFMF shear walls. The diaphragm is a metal deck with 3" of concrete supported by CFMF floor trusses. I understand that RAM SS does not design CMU and CFMF shear walls but is there a way I could at least get the design forces? How does the software determine the relative stiffness of the walls if I assume a rigid diaphragm?

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  • You can model these using Concrete or Other material walls, typically lateral walls. You need to define an accurate E value, thickness (and unit weight). Then you can get forces from the Ram Frame analysis including wall group forces or reactions if needed. In a rigid diaphragm the connected walls have to move together in plan (deformation compatibility). The walls are meshed finite element plates connected to the diaphragm along the length. 



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  • You can model these using Concrete or Other material walls, typically lateral walls. You need to define an accurate E value, thickness (and unit weight). Then you can get forces from the Ram Frame analysis including wall group forces or reactions if needed. In a rigid diaphragm the connected walls have to move together in plan (deformation compatibility). The walls are meshed finite element plates connected to the diaphragm along the length. 



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