123456789_123456789_1123456789Cable-stayed Bridge Software 

Analysis Model
ICDAS CSB 2021.00R

Geometry Model 

123456789_123456789_1123456789 Page  1  2

Cable-stayed Bridge
Model Examples

Model description


BIM model

Analysis model

Landscape model

ICDAS Basis of Design


Additional features

Rendering, Animation &
Vitural Reality   

Case Study and 




Increasing stiffness of the deck box

The deck box stiffness is increased by its depth and the longitudinal plates. It will increase both bending

and torsional stiffness of the deck box girder.

To separate the bending and torsional natural frequencies of the bridge, only the torsional stiffness is wished

to be increased. It can be obtained by increasing e.g. thicknesses of the cross plates. More details are found in 

Case Study.


Shown below is the deck cross section, which is increased to 4m depth in Revit and Lusas, by changing the input
of the 
bottom lines of deck. 

Alternative Text

Figure: Deck depth increased from 3 to 4m, Revit family file.

Alternative Text

Figure: Deck depth increased from 3 to 4m. Add additional longitudinal plates, Lusas models


Shell elements

Shown below are the shell elements and thicknesses assigned to the longitudinal and the cross plates of the deck

(here only two longitudinal plates were created on each side of the cross section except at the pylon). With shell

elements one can get detailed results on each plates of the deck.


FigureAdditional plates at the pylon 

To obtain also detailed results for the pylons it is tested to model in shell elements too (not default in
CSB 2014.06R). However, with respect to nonlinear analysis convergence it is recommended that the
pylon is modelled using 
3D Thick nonlinear beam BTS3 element.


FigurePylons in shell elements

See Case Study and Research


Page  1  2

Updated 02-02-2018


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