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123456789_123456789_1123456789Parametric Buildings (Revit Add-ins FRBL)

Analysis Model Lusas (FEM)
 ICDAS YouTube Channel   ICDAS FRBL 2025.00R



FRBL Model Examples 

Model description  




BIM model


Analysis model


Landscape model


ICDAS Basis of Design


Workflow of Software


Additional features



Rendering, Animation &
Vitural Reality


Trial Version





Automatic FEM model creation in Lusas


ICDAS provide two options for automation of the FEM model, either by DXF or CMD file. Both of options use

the same input for Revit information model.

DXF Lusas

DXF file is exported from Revit Analytical Model View, which is automatically created when you run ICDAS

Add-Ins for 3D geometry model. The house example below shows some partition walls of non-structural in

Revit Geometry Model which are not stored in Revit Analysis Model, and thereby not exported to the FEM

model. The users need therefore to keep control on input structural/non-structural for each wall, and also

beam, brace, column, slab and link elements.


Once Revit Analytical Model has been imported in Lusas through *.dxf file, you need to create meshes for the

imported elements. You need also to check e.g. the floor slabs and the walls are connected at the same points.

Note also that automatic mesh creation will determine the shell axes direction for the results. This option is

default in Parametric Buildings.



Figure: FEM model created from Revit Analytical Model

123456789_123456789_1123456789CMD Lusas

CMD file is automatically created when you run ICDAS Add-Ins in Revit for geometry model. Input for

structural/non-structural elements are as mentioned above.


Once the *.cmd file imported in LUSAS you will obtain correct mesh of the model without further works as the

DXF case. Further, the *.cmd file includes also materials, loads and loads combinations on the building, just

ready for the analysis work. Most important is that, the *.cmd file is programmed in LUSAS discipline and does

not depended on Revit model, at all. It just uses the same Excel input for the Revit model. I.e. the users will

obtain both of geometry and analysis model on the same time. This unique option is available only in specific



Note further that LUSAS has Smart Combinations of load cases. It detects automatically which loads are

favourable or unfavourable in a combination, and which combination is worst among many. This feature

reduces time and complication for verification of the elements significantly.


If you use StruSoft or Robot, ICDAS automatic models creation in Revit has already options for structural/

non-structural element needed to export to StruSoft/Robot.


Automatic FEM model creation in StruSoft

For StruSoft you need first to install StruSoft StruXML Revit Add-In in Revit. Then in Revit you export the

automated model to *.struxml file from the above addin. Check the StruSoft video for connection status and

mapping materials of elements in this addin. In StruSoft you open the *.struxml file for the analysis model.


Automatic FEM model creation in Robot

For Robot you can apply Revit Integration with Robot Structural Analysis. It requires Architecture, Engineering

& Construction (AEC Collection) installed including both of Revit and Robot. Extension software needed to install to

make use of the Revit - Robot workflow. Before you can run Robot you need to create the mesh as mentioned for

Lusas DXF.


See Workflow of Software and Additional Feature for other details.

Updated 13-04-2022


123456789_123456789_1123456789ICDAS  •  Hans Erik Nielsens Vej 3  •  DK-3650 Ølstykke  •   E-mail: th@icdas.dk  •  Tel.: +45 60 53 83 79  •  CVR no.: 34436169