Torsional Moment of inertia (J, IT, K), for calculation of torsional deformation 
   Namespace:   Autodesk.Revit.DB.Structure.StructuralSections  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2015 
  Namespace:   Autodesk.Revit.DB.Structure.StructuralSections  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2015