Drop beam system, it will disassociate all members from the beam system and delete the beam system. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2011 
Syntax
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Parameters
- beamSystem
-  Type:  Autodesk.Revit.DB BeamSystem  
 The beam system to be deleted.