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  Steel Frame Bridge

Model description 
ICDAS YouTube Channel   ICDAS SFB 2022.00R 

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Steel Bridge Model

Model description


Geometry model

Analysis model

Landscape model

Basis of Design &


Workflow of Software

Additional features

Rendering & Animation 

Case Study and 



Welcome to ICDAS Add-Ins for automatic creation of Steel Frame Bridges (SFB).

This section (and sections on the left menu) is a brief introduction to working with automatic model

creation of Steel Frame Bridges. It describes the basic methodology and is not contained all ICDAS 

tools and descriptions. All examples are generic for worldwide use and do not conform to specific

company standards. Refer to a ICDAS licence for more details on all parameters and guides to your



To automate geometry and analysis models, you need licence for the following software

which are run in Window 7 and 8 operative system:


§      ICDAS SFB 2022.00R

§      Revit 2022

§      Lusas Bridge V19 (also on previous version)

§      Input Excel file (*.xlsx with 1048576Rows*16384Columns).


To use Virtual Reality in Revit LIVEyou need VIVE VR System where computer graphics NVIDIA GeForce

GTX 1060 (or above) and all other requirements (HTC Headset) are listed in the link.

Geometry model


ICDAS SFB create BIM model automatically in Revit from Excel (or text) input file.

Once the BIM model is obtained in Revit, the user can create all 2D sections for drawing

dimensions.The bridge is created in relative coordinate at origin (0,0,0) for both of Revit and Lusas

models. Once the absolute coordinates are know, the user can replace the origin point with (X,Y,Z)

in input, and run the model again. All created 2D drawings and sheets will be updated accordantly.

Figure below shows automatic creation of steel frame deck in Revit. Enlarge this image you will see

the spaces at intersections of beams and diagonals, which are ready for Revit structural connections.  


Figure 1: Revit parametric model of Steel Frame Deck, 16x60m.

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Steel structural connection


See Revit 2017 New Structural Features.

Analysis model


When create geometry model in Revit (by run ICDAS add-ins in Revit) a Lusas*.cmd file is also created.

Import this file in Lusas, the user will obtain analysis model (FEM) created automatically. The FEM model

is also included loads on bridge in case they are activated in input (the first UDL is non zero).


Figure below shows automatic creation of steel frame deck in Lusas Bridge. Enlarge the image you will see
the shell elements are integrated with the beam elements longitudinal and transverse. The piers have been
manually created using predefined cross section stored in ICDAS Lusas template file.

: LUSAS FEM parametric model of Steel Frame Bridge, 16x60m.

Load model


Automatic loads creation free your time to define and assign loads on bridge. Further, single loadcases,

basis combinations, envelope of single loadcases, envelope of basis combinations, smart combinations

and final envelope of smart combinations in Lusas are all automatically created. It is ready for you to

analyse and document the bridge.


Figure below shows Lusas model where some concrete shell elements (green surfaces) are shown above
the steel frame. Further, load on bridges are also automatically created on each surface creating the
concrete deck. The UDL (Uniformly Distributed Load) is shown in light-blue colour as a single case act on
a single surface. Lusas "smart combinations" of loads will combine these single surface cases and found
out which cases yield Max/Min result at a selected node on bridge. See further in Arch Bridge 
Loads Model.

Updated 17-03-2022


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