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ICDAS Concrete Arch Bridge Example 1/2


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Arch bridges still be a winner bridge type in many terrain conditions even expensive cost for casting the concrete arches. However, casting concrete of the arches provide often modern-looking compared to traditional steel arches. This section is about the concrete arches locating below and above the deck.


With creative application of inputs, the users can easily create a concrete arch bridge. This section shows Lusas and Revit models and some required manual modifications.

 

 

There are 5 steps example which are installed in ICDAS ARB and ICDAS CSB.



 

Figure 1: Top concrete from the steel arch bridge.

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1. Reuse Lusas model for traffics automated on top concrete deck


The top concrete on steel cross beam can be reuse for concrete box deck. Traffics and loads combinations have been

  created for the steel arch bridge. All the steel components can easily be deleted by select assignments from Lusas

  Groups or Attributes tab (automated for the steel arch bridge). Then create the two concrete webs and bottom plate

  manually.


› Above shown for horizontal distances y1-y8 and associated thickness at Y1, Y2.

 

where

 

  210+30+t+(y1)*25/1000=557.5

   210+t+(y1)*25/1000=547.5

   t+(y1)*25/1000=337.5

   t+(y1+y2)*25/1000=412.5

   t+(y1+y2+y3)*25/1000=500.0

   t+(y1+y2+y3+y4)*25/1000=525.0

 

and where

 

   210mm = inner height of the edge beam

   30mm= increasing height to the outer height of the edge beam

   t = 326mm to obtain 525mm thickness at STL (thickness of deck at the End Left and End Right without the edge beam). 

 

 

 

 

 

 

 

Figure 2: Concrete deck outer shape input, Excel BRIDGE sheet.

 

2. Automate 3D concrete deck outer shape


›  The outer shape of concrete deck can be input from the cable-stayed bridge.


›  Above shows the three left lines L5-L7 are adding for the edge beam (from the cable-stayed bridge example).

   The same for the three right lines R5-R7. There are 4 simple bottom lines. Enter 0 for the not used steel thicknesses, 

   or just leave it.

 

 

 

 

 

 

 

Figure 3: Creation of the hole.


3. Modify the concrete box


› Double clicks on the massive deck to create the hole. Refer ICDAS Revit Bridge for direction and object type of the deck.

 

› Keep the top slab having a flat bottom as Lusas model since we will reuse traffic modelled in Lusas model in this case.





 

 

 

 

Figure 4: Creation of the arch and the piers.


4. Create the arch & the piers


› The arch and the piers are created on the same family file of the deck. Refer ICDAS Revit Bridge for direction and object

   types, especially regarding the holes to reduce the weight of the arch. Creations will take 20-30 minutes for all

   components from knowing estimate dimensions.

 

› Above shows dimensions in mm with 1 decimal. Not because the bridge must build in that accuracy, but it helps the

  manual clicks to be accuracy as the ICDAS automation. 





 

 

 

Figure 5: Load bearings into the deck family file.


5. Load bearings into the family deck file (static system)


› ICDAS provide library of bearings being using to load into the deck file. Refer ICDAS Revit Bridge to locate them above

  the pier columns.

 

› As the deck bottom is fixed to top of the arch at center, free sliding bearings applied on top of all pier columns on the

  two sides of the center cf. figure 4. It allows free temperature expansion of the deck without horizontal forces acting on

  the height columns.


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