About the 3D - IFC Workflow
Explains the concept of the 3D - IFC Workflow planning type.
With the 3D - IFC Workflow , you can import architectures from an IFC file to create a linked DWG drawing and then analyze the building with LINEAR Building. If there are changes in the source IFC file, the link can be established again without losing any adjustments that may have been made.
The Workflow offers command groups with commands you can use for linking IFC architectures and for postprocessing the building models created as a result. You can then transfer, analyze and dimension the generated and edited building model in LINEAR Building.
Linking the IFC File
After selecting the IFC file that contains the architecture to be linked, you can specify which objects of the IFC file will be imported and whether any existing IFC zones will be imported as apartments or building parts. During the import, all IfcSpace of the IFC file are taken over as rooms with the data and building parts stored in the IFC file and get a room tag. Overlapping IfcSpace whose upper and lower edges intersect (e.g. in staircases) are merged into one room during the import.
Processing after Linking the File
After linking the IFC file, you can view any reports that may occur regarding errors, warnings and information in the report window and edit the messages.
In addition to the option of editing data for individual rooms, you can also define shafts at a later time. If a shaft has been modeled as an area enclosed by walls in the linked architecture, but is not marked as a room, you can make the shaft “visible” for building detection with or without room data after the link has been established.
If a shaft enclosed by walls is not defined as a room, adjacent room components are incorrectly marked as adjoining the outside after the building has been detected.
Shafts with room data are given a room tag and are adopted as a room during building detection in LINEAR Building. Select a suitable room type in the Room Data dialog and check the Heating/Cooling temperature. Shafts without room data do not receive a room tag and are not transferred during building detection. However, adjacent room components are correctly marked as being adjacent to Unheated Rooms.
The geometry of the architecture is taken from the linked IFC file when the building is created, so do not create shaft surfaces in existing rooms. Due to the lack of enveloping surfaces, such shafts are not correctly recognized in the building detection.
Transfer of the generated building model to LINEAR Building
Before the building is imported with LINEAR Building, you can exclude rooms from the detection in AutoCAD and execute a building detection to check the building structure of the model and make adjustments if necessary. For buildings with modeled floors, you can specify that only the modeled floors and not the floor structures stored in the storey table are taken into account during the transfer. You can also specify whether the data stored in the storey table or the topography of the drawing is used to determine the ground level.
The import of the building with LINEAR Building is carried out. In LINEAR Building, you can define specific settings for individual parameters via the synchronization settings in the configuration if required. When the building is transferred, all data from the building model that is required for the different dimensioning rules of the various standards in LINEAR Building is transferred as standard. If a building model contains components consisting of materials that were not defined in the IFC file, these components are created as pseudo components in LINEAR Building. You can then assign a U-value to these pseudo-components in LINEAR Building or define the layered structure of the components. After building detection, if there are components in LINEAR Building, which are, for example, incorrectly identified as adjoining the Exterior, you can trace the storey outlines of the individual storeys. This improves the detection of adjoining components, and you can then carry out the detection again or update the building data in LINEAR Building.