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123456789_123456789_1123456789Concrete Bridge Software 

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Technical University of Denmark ♦ DTU Ballerup Campus

Exam project 2015/2016 ♦ Answer Book & Case Study

 

Motorway Bridge over Savstrup Stream in Jutland Denmark

Terrain  -  Geometry  -  Analysis 1 2 3 

 


 

 

 


BIM model (Revit Bridge Geometry)


 


Creation of the 3D bridge in Revit is an extension of terrain model just created from Civil 3D. The horizontal

alignment, longitudinal profile and slopes of cross section of the pavement overpass are created from Civil 3D,

and can not be changed in Revit, unless you redesign the corridor in Civil 3D file. From this point on, you will

work with Revit Bridge using parametric families of the bridge's components. In this context you will enter input

for the family files. Revit will prompt windows up for you to select type and enter dimensions of the deck, the

 edgebams, the abutments, the piers and the bearings.

 

Once Revit has been successfully created these families, you will get a 3D bridge incl. terrain surface as

shown in Figure 1 below. 


From Revit 3D model you can (as shown in Figure 2, 3, 4, 5...):

 

      create Revit Views for documentation (drag to sheets)


      use 3D Section Box and 2D sections for the details (dimensions,  elevations, annotations and so on)


      modify a component in bridge in family file (*.rfa) and load it into project file (*.rvt)


      when a bridge component is updated, the 3D model is accordingly updated, also all associated views

     and sheets


      use Revit automatic creation of documentation

 

You will work only in one project file (*.rvt) including all views and sheets. 


123456789_123456789_1123456789Click on the images below for enlarging in 3000 pixels.



Figure 1
3D Bridge and terrain
   

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Figure 2 shows the underpass dimensions and

coordinates. The bridge is designed in 4 spans of

30+37+37+30m measured horizontally. These 

lengths measured along the stationing line (STL

centre line) will be a few millimetre longer because

of the curved alignment R3500m.

 

The coordinates are reported in UTM84-32N code
created from terrain model (Civil 3D). Using Revit >
Annotate you can click
any point on the bridge for
the coordinates (North, East) and the elevations.
The point's report can easiest be selected at an
intersection, but along a line as well, e.g. on a line
creating the deck, the piers or the foundation

The coordinates and elevations selected at the corners of

the foundations are on top of it due to the Top View is set

active. The elevations can be checked with these in Figure

3, 4 and 5.

 

The coordinates and dimensions below are enough to
position the foundations in the North-East plan.
 












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Figure 2: Underpass dimensions and coordinates (Overpass stations in mm).
   

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Figure 3 shows the West Elevations with terrain

surface. From this view you can check:

 

      foundation's level relative to the terrain.


      free height between bottom of deck and the

     terrain


      longitudinal profile is sloping down 2.8% from

     north to south


      cross direction is sloping down 2.5% from east
     to west
Use 3D Section Box at Pier 2 to check the free height
(click two points for elevations at bottom of deck and
on the terrain, see example for Pier 4 in Figure 6).
 

















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Figure 3West Elevations
   

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  Figure 4 and 5 shown vertical sections of the north
and the south abutment. Top of abutment is design
in slope 2.5% as the deck so the bearing can place
directly on it without the pedestals. All dimensions
are given for the deck cross section. 
The centre box of 5500mm is where you design the
prestressing cables. 

 


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Figure 4, 5North & South Abutments
   

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  Figure 6 and 7 show an example of 3D Section Box.
You can check the free height at Pier 4 as
27211-19653=7558mm. 
Elevation 19513m at bottom of the south abutment below
is agreed with elevations in Figure 5 and Figure 1 on top of
the foundations where 700m is the thickness at the outer
edge. 
 


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Figure 6, 73D Section Box
   


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  Terrain  - Geometry  - Analysis 1 2 3   Savstrup Bridge 


Updated 04-02-2016


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