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123456789_123456789_1123456789Concrete Bridge Software 

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ICDAS YouTube Channel   ICDAS COB 2022.00R

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Concrete Bridge

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Case study





Opposite Circular Arcs Alignment Bridge Deck

ICDAS COB Option 1 (Revit Family)


Key words

-  Deepest line elevation, relative elevations, thickness of deck, 3D model, section views


Click on images and click again for 3000 pixels view.

View 1: Bridge alignment, Sections and Views definition, Floor Plans Site View.




123456789_123456789_1123456789The bridge has an alignment of two circles of radius
30m, View 1. To keep the design simple the bridge
is assumed symmetrically in horizontal plan where
the angle to true north has been set to zero in Revit
Floor Plans Site view in project file.
12345678 The bridge is created in family files then loaded into
project file. Having global coordinate of the bridge at
the centre point, the user can enter it for Project Base
Point in project file to obtain the true location of the
bridge, and thereby the true setting outs of geometry.




View 2: Section 1 at the start of curved stretching of the alignment (input)




View 3: Section 3 at the centre of curved stretching of the alignment (output)



View 4: Section 2 at the end of curved stretching of the alignment (input)


The cross sections of deck are designed at the start

and end of the alignment, called Section 1 and 2,

limiting the stretching of bridge where it is curved.

Once the 3D deck girder is created based on these

two sections and the curved alignment, the user can

automatically create any cross section in between,

here e.g. Section 3 at the centre of the deck girder.


Elevations of the bridge have been set relative to the
absolute level, here 20m. Section 1 has the deepest
on the right side top of deck , elevation
1540mm. This elevation becomes on the left side of
the Section 2. At the centre of bridge, Section 3, the
deepest elevation 1540mm becomes in the middle of
the cross section.

The bottom of deck has a slope of 2.5% as the top of

deck in Section 1 and 2. It yield 102mm above the

absolute level 20m at the highest corner of the bottom.

At the centre of bridge, Section 3, the bottom of deck

becomes horizontally with the mean elevation of 51mm



The centre boxes of the three cross sections have
been designed to keep a constant thickness of 1095mm.
The edge beams has an outer thickness of 545mm on the
higher side, and 640mm on the lower side of the cross
sections, as they are inputted for the Section 1 and 2.
As the result, the Section 3 automatically has a mean
value of thickness of (545+640)/2=593mm for both of
the two edge beams.







View 5Elevation view of bridge from East

123456789_123456789_1123456789Elevation East shows the east view of the bridge.
Elevation 2019mm is from Section 2, top of the edge

12345678 The bottom of pier is 7000mm below bottom of deck,
and the bottom of piles is 19600mm below bottom of
deck. All foundations have 600mm thickness. The piles
have cross section 250x250mm.




View 6: Elevation view of bridge from North

123456789_123456789_1123456789Elevation North shows a view from north side of the
12345678 Elevations 2019 and 1840 are shown for the Section 2
on the left.




View 7: 3D view of bridge from South from top

123456789_123456789_1123456789The 3D South Top shows the bridge from the south
side from above.
12345678 The deepest elevations 1540mm on top of deck are




View 8: 3D view of bridge from South from bottom

123456789_123456789_1123456789The 3D South Bottom shows the bridge from the
south side from below.

12345678 Elevation 0 at the bottom of Section 1 turns to be
120mm at the end of Section 2. At the centre of
bridge, Section 3, the mean elevation is 51mm.




View 9: Pier and piles (input)

123456789_123456789_1123456789The pier is designed in V-shape with two ellipse
columns. The ellipse column has the long axes along
the foundation at the bottom, but turn to be along the
deck on the top. Thus, the upper half of the column
has the strong axes against the bending due to load
from the deck.
12345678 The piles are designed inclining in both of bridge
direction and cross direction. It is needed due to the
curved bridge deck, the braking forces, temperature
expansions, creep and shrinkages from the concrete


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