123456789_123456789_1123456789Cable-stayed Bridge Software 

Geometry Model
ICDAS YouTube Channel   ICDAS CSB 2017.00R

Geometry Model 



Cable-stayed Bridge
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How to create Revit model automatically?

It happens when you run ICDAS Add-Ins in Revit. The input files are located in C:\ICDAS\ICDAS BRIDGE

when you installed ICDAS CSB 2017.00R


Once 3D model has been automatically created in Revit, all 2D drawings can be generated, drag to

sheets for the documentation (BIM).



What type of cable stayed bridges and how to create input?

ICDAS CSB 2017.00R allows you to create three spans cable stayed bridges. It can be a short footway bridge or a

long span road bridge. The input is parametric and entered in either Excel or text files. By changing e.g. few inputs

and running Add-Ins in family file ICDAS_3DPylonCable.rfa one will get an updating of the cable stayed bridge in

A-Pylons (Top), H-Pylons (Centre) and V-Pylons (Bottom) as shown below.






Figure: Cable stayed bridges in A-Pylons (Top), H-Pylons (Centre) and V-Pylons (Bottom)


Cable arrangements

The longitudinal layout of the cables is a fundamental issue due to the following considerations:

§         Structural performance of the bridge, static and dynamic

§         Method of erection and the economics

§         What desired effects regarding architectural impression.

Using ICDAS one can in a minute switch between the layouts of cables in harp, fan and semi-fan system by
changing the vertical spacing h5 of the cables at the pylon. The bridge will update automatically in Revit 3D
geometry and FEM LUSAS Bridge 3D as well.

FigureHarp system, h5=6300m


In harp system the declination angle of each cable is constant, which gives the same anchoring design at the

deck considering the case of longitudinal slope of the deck is 0.

FigureFan system, input h5=500m


In fan system all cables are connected to the pylon theoretically at the same height. This system has several

advantages compared to the harp pattern:


·  Vertical component of cable is more effectively used to carry the sectional weight of the deck

· Longitudinal component of the cables give less compression in the deck

· Bending of the pylon caused almost by one longitudinal force only as the sum of all cables connected to it.


However, the connection zone of the cables at the pylon in fan system is heavily concentrated, which requires

special design and analyses.

FigureSemi-Fan system, h5=3000m


Semi-Fan system combines the advantages of the harp and the fan systems. In this system the vertical spacing

of the cables on the pylon can better be arranged than the concentrated zone of the fan system and the bending

of the pylons remains moderate.

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Stations of Pier, Deck and Pavement

The pavement along the corridor overpass is created from

stations given in Revit Roads and Terrain.


The deck is created along the corridor overpass and stops at

the two stations of abutments given in Revit Bridge. In the 

case of cable stayed bridge, the "abutments" are created as

piers by family ICDAS_3DPier.rfa, which can be designed

parametric and loaded into bridge.


The two bearings below the deck have dimensions given

in Revit Bridge, and attached to the pier position by the

station and reference level automatically.

The cross beam between the two pylon legs is designed

below bottom of deck by input h3 in ICDAS (not used to

support vertical the deck).


Cross section of the deck box, the pylons and the cables

are specified by input in ICDAS, and created automatically

in Revit Bridge by family files.


: Pier, Deck and Pavement

Updated 17-06-2016

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123456789_123456789_1123456789ICDAS  •  Hans Erik Nielsens Vej 3  •  DK-3650 Ølstykke  •   E-mail: th@icdas.dk   •  Tel.: +45 29 90 92 96  •  CVR no.: 34436169