S o f t w a r e     f o r     a u t o m a t i c     c r e a t i o n     o f     m o d e l s     u s i n g     p a r a m e t r i c     d a t a

123456789_123456789_1123456789Cable-stayed Bridge Software 

Basis of Design & Documentations
ICDAS YouTube Channel   ICDAS CSB 2024.00R

Geometry Model 


Cable-stayed Bridge

Model Examples


Model description




BIM model


Analysis model


Landscape model


ICDAS Basis of Design


Workflow of Software


Additional features

Rendering, Animation &
Vitural Reality

Case Study and 

















A. Projecting Documentation

A1. Bridge location

A2. Elements

A3. Principle of the bridge

A4. Partner relation

A5. Agreements

A6. Enclose and annex




B. Basis of Design

B1. Design background (Eurocodes)

B2. Materials

Concrete 40MPa

Reinforcement cover 50±5mm


B3. Loading & Load Combinations

Railway bridges

Dynamic factor F as F(2) for carefully maintained track, or F(3) for standard maintenance,  cf. Eurocode 1 Part 2: Traffic loads on bridges EN 1991-2:2003 p.78

B4. Principle of limit states

Ultimate Limit States (ULS)

Serviceability Limit States (SLS)

Accidental Limit State (ALS)

Fatigue Limit States (FLS)

 news: MCB. ICDAS Basis of Design.jpg


123456789_123456789_1123456789B5. Design Criteria ULS



ULS Load Combination

Maximum concrete compression stress sc < 0.70 fcd (for axial N dominant comb. cases)

Maximum concrete compression stress sc < 0.60 fcd (for bending M dominant comb. cases)
Maximum reinforcement tension stress ss < fyd

cf. Eurocode 2 Design of concrete structures DS/EN 1992-1-1+AC:2008



123456789_123456789_1123456789B6. Design Criteria SLS



SLS Quasi Permanent Load Combination

For prestressing cables, no concrete tension stress from top to bottom

of deck cross section for section perpendicular to the cables
Concrete structure & reinforcement
Maximum upward vertical deformation uz < L/250 (quasi-permanent loading)
Maximum downward vertical deformation uz < L/500 (quasi-permanent loading)
cf. Eurocode 2 Design of concrete structures DS/EN 1992-1-1+AC:2008, p.126
Maximum concrete compression stress sc < 0.45 fck
cf. Eurocode 2 Design of concrete structures DS/EN 1992-1-1+AC:2008, p.118 



SLS Frequent Load Combination

Crack in concrete (reinforcement verification)

Crack width wk<0.3mm for deck, wk<0.2mm for edge beams

cf. Eurocode 2 Design of concrete structures DS/EN 1992-1-1+AC:2008, p.119,123




SLS Characteristic Load Combination

Road bridges

Criteria regarding deformation and vibration

cf. Eurocode Basis of structural design DS/EN 1990/A1, Annex A2 p.23

Railway bridges

Maximum vertical deformation uz < L/600 (characteristic vertical loading)

cf. Eurocode Basis of structural design DS/EN 1990/A1, Annex A2 p.27

Concrete structure & reinforcement

Maximum concrete compression stress sc < 0.60 fck

Maximum reinforcement tension stress ss < 0.80 fyk

cf. Eurocode 2 Design of concrete structures DS/EN 1992-1-1+AC:2008, p.118



123456789_123456789_1123456789B7. Design Criteria ALS


123456789_123456789_1123456789B8. Design Criteria FLS




C. Static Documentation

C1. Introduction

C2. Summary of results

C3. FEM model, construction phases & support conditions


C4. Loads on bridge & loads combinations

C5. Static analysis in ULS & SLS

      C5.1 Maximum reaction at foundation, ULS

      C5.2 Deflections control, ULS & SLS

      C5.3 Stress capacity verification, SLS Quasi

             (Here prestressed cables capacity verification if any)

      C5.4 Reinforcement capacity verificationULS & SLS

      C5.5 Concrete capacity verificationULS & SLS

      C5.6 Shear capacity verificationULS & SLS

C6. Static analysis in ALS & FLS

C7. Dynamic analysis

C7.1 Natural mode shapes and frequencies

C7.2 Buffeting and vortex response

C7.3 Multimode coupled flutter and buffeting analysis

C7.4 Active/passive vibration control  


C8. Appendixes 





D. Design Documentation


D1. 3D landscape & bridge geometry

D1.1 3D landscape overpass and underpass (corridors)

D1.2 3D bridge geometry in detail

D2. 2D section drawings 

D2.1 2D section drawings from 3D model (dimensions)



123456789_123456789_1123456789E. References

Vejledning til Belastnings - og Beregningsgrundlag for Broer, Vejregler 23-11-2017
Lastmodeller for klassificering og bæreevnevurdering, Vejdirektoratet 1. Juni 2013

Cable-stayed bridges - List of all structures


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