A floor slab modeled in Revit may not import into Ram Concept using ISM for various reasons.
In order for a Concrete Slab in ISM to be imported into Ram Concept that slab must be:
Normal slabs using default Structural Family files modeled on plans typically work fine, but if with custom floor families it's possible to set up a floor slab that will not pass these tests. Then, when importing the model into Ram Concept there will be no valid slabs to import and the result will be an empty Ram Concept file.
You can also confirm the validity of the slab using the Structural Synchronizer Viewer. Select the slab and confirm these things.
Ram Concept can import slabs with steps, but not sloped slabs.
The program will also import columns and walls. In order to import, the columns and walls must be:
For multi-story structures the preferred workflow is to import or model the structure from scratch in Ram Structural System and then generate the Concept floors directly from that Ram SS Model.
RAM Concept-RAM Structural System Integration TN