In a 4 part tutorial, Junghwo Park explains how to create a simple 1 storey structure in Karamba & Grasshopper and then export the geometry into Revit using IFC formats in Geometry Gym.
The third and fourth tutorial explain how Geometry Gym can be used to export the geometry created in Karamba into Revit. You can download Geometry Gym from here.
The first two tutorials show how this simple structure of beams and shell can be created in Grasshopper and then analyzed in Karamba. See Tutorial 1 & 2 – Analyze a Shell & Beam Structure.
Get the reference files here: KarambaToGGymToRevit