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07-02-2017


Double Curved Concrete Bridge Deck using ICDAS Revit

 

ICDAS Concrete Bridge provides high level accuracy project design using Revit intelligent model-based technology.

3D model is created as the basis for all associated 2D sectional drawings, which will be dynamically updated for

changes in 3D model. ICDAS COB provides libraries with predesigned bridge models, where the alignment will be

replaced by the users for an actual project.

 

Below shows an example of bridge designed in Revit relative coordinate. It can be easily moved to the global

coordinate, rotated to the true North at Revit Project Base Point. The example is focused on the changed types

of the deck cross sections.

 

 

Key words

 

Deck type and thickness. Elevations check.

 

 

Figure: Floor plan Site view of bridge. The station direction is from West to East.

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The bridge has a double curved concrete deck with the following data:

 

Alignment radius

Cross section slope

Longitudinal slope

30000mm

2%

5.622%

 

Total length

Spans

Lanes

83776mm

10472 + 20944x3 + 10472mm

4 lanes a 3500mm

 

The given lengths are calculated as arc-length on the floor plan. The 4 piers are located in 20°, 40°x3 and 20° from the

center of alignment as shown above. The approach bridges at the start and end of the 160° bridge are not modelled here.



 

Figure: Deck in 4-bottom-lines cross section at Section Start.


The 1st cross section is a normal 4-bottom-lines massive deck having slope 2% and anti-slope 11% at the last 540mm width.



 

Figure: Deck in 4-bottom-lines in Elevation South.


The double curved alignment is characterized by the West end is 4710mm higher than the East end in this example shown above.

 

It takes less than a haft of hour to create this bridge for creation of the alignment and the massive 4-bottom-lines.

The piers, foundations and piles are predesigned in ICDAS library and just loaded into any project.


 

 

Figure: Deck in 6-bottom-lines cross section at Section Start.


The 2nd cross section is a 6-bottom-lines massive deck having the top surface as  the 1st cross section. The thickness

at center raise to 1100mm to obtain the minimum thickness 310mm on the right wing of the cross section.



 

 

Figure: Deck in 6-bottom-lines in Elevation South.


The elevation at the West end keeps unchanged 4710mm above the East end so the South view above is updated from 

the 1st case without any modification.




Figure: Deck box-girder cross section at Section Start.


The 3nd cross section is a box-girder designed in 1500mm depth from top to bottom surface at center of the box. 

This box-girder has a significant bigger bending and torsional stiffness compared to the two first massive deck.



Figure: Deck box-girder in Elevation South.


The elevation at the West end keeps unchanged 4710mm above the East end so the South view above is updated from the 1st case without any modification. 

 

 

 

Figure: Massive 4-bottom-lines vs. Massive 6-bottom-lines  vs. Box-girder deck.


123456789_123456789_1123456789 ICDAS   •    Hans Erik Nielsens Vej 3   •    DK-3650 Ølstykke   •    E-mail: th@icdas.dk    •   Tel.: +45 20 20 33 78   •   CVR no.: 34436169