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09-09-2017


Double Curved Reinforcement using ICDAS Revit 2018.1

 

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

This example updates new function Free Form Rebar 2018.1 relating double curved reinforcement mentioned in previous examples.


The model is a conceptual design for 3D information model without structural analysis confirmation. Analysis model can be automated in LUSAS using ICDAS COB tool. 

 

 

Key words

 

Curved plan alignment, deck cross section and pier. Revit 2018.1 Free From Rebar.



The example below shows a double curved concrete deck with circular arc in plan alignment and at bottom of deck. The alignment has extreme small radius of 20m. The edge beam inner on the left and right side have the radii of 23.5m and 16.5m as shown below. The purpose of the small radii is to test free form rebar function in Revit 2018.1.


Figure: Plan view of bridge. Dimension in mm.

 

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The deck cross section has two lanes of 3500mm and thickness 800mm at the alignment center.

The bottom of deck has radius 15.408m. Below shows cross section of deck created automatic from 3D model

at a section perpendicular to the bridge alignment.


 

Figure: Cross section with bottom radius 15.408m. Dimension in mm.



On site

 

The longitudinal rebar have different radii which are increased 200mm towards the outer beam as the distance 200mm between the bars. Such curved rebar has been used in circular foundation for wind turbines. 

 

The cross rebar at bottom of deck has constant radius (15408-45)mm where 45mm is the reinforcement cover.


 

Figure: Top reinforcement & stirrups


Figure: Bottom reinforcement & stirrups



The vertical stirrups are most complicated to model as the concrete deck has too small radius. Free Form Rebar is not yet available for this shape of rebar and ‘Sketch Rebar’ has been used in this case.

 

The stirrups are modelled in group of arc length 2051mm, 5°, stepwise in the edge beam direction. A group has 10 stirrups which are parallel to each other. On site we can adjust them in direction of the radian cross axial rebar, where each stirrup is perpendicular to the axes of the edge beam.

     

   Figure: Top view of stirrups

 

Pier Design

 

ICDAS provides free possibilities to design vertical concrete objects. Show below is an example of pier design with curved legs three-point arcs. The arc length 7881mm on the right side is shorter than the left side of 7970mm because the deck cross section is sloping downward to the right. The top of pier is 100mm offset below bottom of deck for spacing of bearings (not shown). There are tested for two options of the legs width at the bottom, 1037 and 1380mm as shown below. The changes can be completed within a few clicks for concrete geometry and reinforcement as well. For more simple concrete geometry the rebar will be updated dynamically with the changes of concrete geometry. Stirrups are not modelled in the pier shown below.
 

 


Figure: Pier with 1037mm width bottom legs.




Figure: Pier with 1380mm width bottom legs.



 

 

 


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