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Concrete Bridge Model Examples
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Frame Bridges

ICDAS COB Option 1 (Revit Family)

Welcome to ICDAS COB for Frame Bridges.


The examples below are to test ICDAS COB 2018.02 for Frame Bridges introducing 13-04-2018. The examples demonstrate two types of frame bridges, the vertical and the sloping abutments. Below are common notations:

›  ICDAS parametric model has the North direction upwards and easy stations numbering by default. Once the

   true North direction and landscoordinates known at a point on bridge, they are updated in Project Base Point

   Revit model Site view, so the entire bridge will be orienteered in the true position.

›  The same deck (width, depth) = (16000, 700)mm is used in both.

›  Creation of the frame bridge is based on the slab deck supported by two long abutments.

›  ICDAS COB automates the deck in Revit and LUSAS, where abutments, pavement, crash barrier, white lines,

   soil are loaded from ICDAS Libraries for the modifications (ICDAS Revit Bridge Manual needed). For LUSAS

   model the automated deck has also loads and combinations of loads on it.

›  Soil and grass are modelled in the second sloping frame bridge. They will hide the connection between the

   deck and the abutment where it is shown in the first example. Transition slab on abutment is not modelled.

›  Double-click on an image below to open it in a new window (hold and drag it out if the image still in the same

   window). Do the same for the next image to compare two images.


Vertical Frame Bridge


The frame bridge is called ‘vertical’ in ICDAS COB when all abutments are vertical in figures below.

Figure: Vertical frame bridge, Floor Plan view with Section1 (on the left). See the sloping case.


Figure: Vertical frame bridge, Perspective view. See the sloping case.



Each wing of the abutment can be in any angle depending on terrain condition or they are parallel as the center part supporting the deck. In this example the vertical wings are all opening in 45°.

Figure: Vertical frame bridge, South viewSee the sloping case.

Figure: Vertical frame bridge, Section1 (or Left View). See the sloping case.


Section1 shows the deck is casting directly on the abutment at the center, and the wings are casting vertically to the center abutment.

Figure: Vertical frame bridge, 3D View. See the sloping case.


Thus, earth pressures from the abutments will act on the deck. Oppositely, the bracing forces from the deck will be transferred to the soil as an attraction for the frame bridge.


Sloping Frame Bridge


The frame bridge is called ‘sloping’ in ICDAS COB when the abutments are sloping outwards at the bottom, as shown in figures below.

Figure: Sloping frame bridge, Floor Plan view with Section1 (on the left)See the Vertical case.


Figure: Sloping frame bridge, Perspective view. See the vertical case.


The sloping abutments open wider at the bottom giving additional 2x3.5m traffic lanes underpass compared to the vertical frame bridge.

Figure: Sloping frame bridge, South view. See the vertical case.


The above Perspective and the South view shows the sloping abutments are designed to stop 846mm below top of the edge beam of the deck, then two small triangle concrete boxes are casting above. Thus, the sloping abutments run directly under the deck to support the deck.

Figure: Sloping frame bridge, Section1 (or Left View). See the vertical case.


The Left view (Section1) shows the sloping abutments are continued to top of the deck edge beams by the to the two triangles casting above the abutments. These two top triangles 846mm height are only intended to prevent the soil fall on the underpass.

Figure: Sloping frame bridge, 3D View. See the vertical case.


Once create the soil in Revit, one has the quantity of the soil on the foundation for LUSAS FEM model. To drag the soil along and below the bridge overpass, one has the quantity of the soil needed for the overpass construction work if the soil is not existing in terrain condition.



Frame bridge has a simple structural geometry, so the wings can be easily modelled manual in LUSAS from the Revit model geometry. The user can run ICDAS to automate the deck, loads and combinations of loads on it. The case of sloping frame bridge, the user needs to ensure traffic loads act the sloping abutments. Truck on the deck have been automated from ICDAS, also the parts outside the deck. The user needs to define and assign ‘Search Area’ to the sloping abutments so they can detect the traffic loads on it.


Verification of concrete and reinforcement for the long sloping abutments will take time as for the deck, unlike a normal slab bridge with short abutments. Consider the support conditions at bottom of the sloping abutments. Big spring stiffnesses assumed in the abutment direction (at the foundation) will require reinforcement due to the temperature expansion load case. 

ICDAS COB for Slab-Beam Bridges


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