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123456789_123456789_1123456789Concrete Bridge Software 

ICDAS YouTube Channel   ICDAS COB 2018.01R


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Concrete Bridge

Model Examples

Model description


Geometry model

Analysis model

Landscape model

ICDAS Basis of Design

Workflow of Software

Additional features

Rendering & Animation 

Case study


ICDAS provides addin in Revit to read Excel input and automate models in Revit and Lusas. Therefore, keep control over the input is to keep control over what you see on the two models. When you want to undo an input, just press Ctrl+Z in Revit and run addin again for a new input. A LusasCOB.cmd is automatically created (or updated) each time the you run addin in Revit. By import LusasCOB.cmd in Lusas, you will get a FEM model.


ICDAS can read input from Excel (default), text or *.xml format. Excel and text format allow free comments anywhere in the file, except ‘:’ is used read data. All texts from the default Excel file are also comments, except the texts having (i, j) in the grey row may not be changed. I.e. the users do not need to write the texts as the default texts when copy a row for adding numerical input. The users can ask ICDAS for *.xml format with special purpose.  


The users can perform calculations in any other sheet in Excel input, then link the values to the first two sheets for inputs.


The users can keep many bridges in one Excel file, e.g. concrete approach bridges to the main cable-stayed bridge (CSB). Drag the bridge you want to run on sheet 1 and 2 which are the input for ICDAS. You can also keep inputs of two bridges in the same sheet. In this case keep control over the sign ‘:’ for the bridge of concerning.


The user can develop further Excel input for the planning time (4D) and the price (5D) based on the existing input and output writing back from Revit (for quantities, materials, dimensions) and additional input sheet for time rate of wages. Or to combine Excel input in Microsoft Project.


Excel input are for Arch BridgesCable Stayed BridgesConcrete Bridges and Steel Frame Bridges by default. For subscription of a single type of Concrete Bridges, the other inputs will not be run. All bridges are including Concrete Bridges by default.



Input for Concrete Bridge are entered in two sheets ‘BRIDGE’ and ‘STL’. The key parameters are summarized below.


1. Excel input Sheet BRIDGE

/a/ Set Bridge=3 for Concrete Bridge Revit+Lusas model; Set Bridge=13 for LusasCOB.cmd only. The option ‘13’ is used when the users want to keep Revit model but update the LusasCOB.cmd file for Lusas only.

/b/ Create deck in *Profile_2D*.rfa being used in Revit Civil Structures; Only available when Civil Structures add-ins installed in Revit.

/c/ Create pier in *3D_Pier*.rfa being used for all types of bridges.

2. Excel input Sheet STL

/a/ Alignment horizontal radius RY, vertical radius RZ or vertical slopLongiZ

/b/ Cross section slopTop, slopMesh and box thicknesses

/c/ E, Nu, Rho, Alfa

/d/ UDL, Tandem, Class. UDLType on selected lane.

Deck Design


The 4-, 6-, nbottom-lines and boxes of cross section of deck


ICDAS characterizes a concrete deck cross section by many bottom lines to be input. Below show examples for 4-, 6-bottom-lines.


Figure: Lusas (top) and Revit (bottom) model for a 4-bottom-lines.




I addition to the bottom lines, a slab deck is constructed by minimum 8 boxes (surfaces) from right to left of the deck cross section, looking in STL direction. Box A, B, C represent the right wing; H, G, F the left wing of the deck. In between there are box 4 and 5 where box A, B, C count also as 1, 2, 3. Box 4 and 5 in the center can be modelled as many boxes in case of prestressing cables having many longitudinal lines represented the longitudinal cables. Or the cases where the center boxes need to fit many columns support below. ICDAS calculates the varying thicknesses and eccentricities of boxes using the key input of thicknesses and slopes in Excel file. Below shows an example for 6-bottom-lines.


Figure: Lusas (top), Revit (center) and Excel input sheet STL (bottom) for a 6-bottom-lines.



     For horizontal deck set slopMesh = 0 for all boxes in row 4.

     Each box has two thicknesses at Y1, Y2 given at input row 6, 7. Figure above shown Y1, Y2 at box 4 and 5.

     slopTop 2.5% at the edge beam box A and thickness 565mm determine thickness 651mm at box C(Y2).

     If you want to raise the thickness 651, then raise the thickness 565mm (and change the slopTop of box A).

     Set thickness 980mm at the center, then 905=980-3000*25/1000 needed for input box 4 and 5.

     If you raise the thickness 980, then modify the 905 accordingly.

     slopTop input for box 4 and 5 needed for Revit only


ICDAS COB provide automations for the about two 4- and 6-bottom-lines profiles, rectilinear or circular arc alignment of the bridge, in Revit and Lusas models known as Option 1. 


Update 07-01-2018 

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ICDAS  •  Hans Erik Nielsens Vej 3  •  DK-3650 Ølstykke  •   
E-mail: th@icdas.dk   •  Tel.: +45 20 20 33 78  •  CVR no.: 34436169