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18-12-2016


Double Curved Concrete Slab Deck using XYZ-Points Alignment

 

 

ICDAS COB Option 3 (Dynamo)


(3D Rebar in this bridge deck with slope 0.1% alignment longitudinal)

 

Key words


-  Plan Alignment, Aligment Vertical Profile, Deck Profile

 

Click on images for 3000 pixels view.


This example outlines a double curved parametric concrete bridge deck using ICDAS COB Option 3. The piles, piers,

and bearings from ICDAS Bridge Library are loaded into project file. This issue is not mentioned here but the focus is

the double curved bridge deck, and the multi-slopes on top of deck profile.

 

Creation of geometry of the curved deck is based on Dynamo code from Autodesk Dieter Vermeulen. In Autodesk

example, Dieter Vermeulen has applied Excel Corridor Points of Road created from Civil 3D. The top of deck profile

has one-sided slope.

 

This example creates a corridor with alignment as a circle line radius 100m. The longitudinal vertical profile slopes

5% down from West to East, to create a double curved alignment. The top of deck profile has three slopes.

Data for this fictive corridor is shown in Excel file below.


 

Input: Corridor of the road in Excel file.

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Input: The black values are input for the deck profile cross section.


Inputs of the deck cross section are show with the black values above, whereas program calculate the blue values.

The cross section has two lanes of 2x3500mm on the left and the right side of the bridge center alignment.

The slopes on the left and the right lane are both 2%.


Because of the double curves, this manual input needed to be adapted after the desired results. Input for the right

lane width has been set to 7134 in Excel to obtain 7000mm in Revit. It is due to the longitudinal slopes 100mm down

for each step point of 2000mm (5%), have been given manually.  Also, the input for the right lane slopes has been

subtracted 105mm in the Excel Corridor file. The final corrected Z-data in Excel columns should be directly obtained

from Civil 3D in a project case.


Check of geometry for multi-slopes on top of deck profile are described below.

 

    The concrete deck locates 110mm below top of pavement. The one-sided slope on top of deck is 2% count

    from the edge beam inner points to the center STL, i.e. a vertical distance of 7000*2%=140mm.


    On the left side, at the edge beam inner point: 30+110=140mm ü


    On the right side, at the edge beam inner point: 250-110=140mm ü


    Further, the input contra slope 11.1% on the right side gives 540*11.1%=60mm ü


 

Below show 30 steps of 2460mm created by program the circle alignment in top view. 

 

Output31 profiles created the bridge corridor



In ICDAS input, 31 profiles have been given (red). As many profiles, as good for the program to fit the designed bridge

to the road alignment. However, Dynamo Revit does not crash even for input of 3 profiles only (2 segments of deck).

 

Also in ICDAS input, the total horizontal length of the circle is 72mm, which is input in 2m point step. It gives a segment

length of 72000/(31-1)=2400mm. The above figure shows 2460mm calculated by the program as the curved length at

the centre of the bridge.


 

 

Output: Stations along alignment.


From the above created segments length, ICDAS creates the stations at every three segments along the alignment.

The station assumes to start at the start of the deck, called ST. 10000mm.

 

Note that the station values normally are given in Meters, and big values. Here to keep the values simple to read, the

start station is set to be 10m. Note further that the current Dynamo Revit code does not considered the station values,

but work only on (X, Y, Z).


 

 

 

 

View SSouth view elevation.

 

 

 

View NNorth view elevation.


Once the double curved deck created, ICDAS load the piles, piers, and bearings into the project file where the curved

deck family has also been loaded. ICDAS Bridge Library provide a large option of piles, piers, and bearings which are

predesigned ready to load into any project file. 

 

ICDAS Bridges has no limited number of spans. This example illustrates the two curved spans (and the cantilevers)

but it is as easy to load the other spans on the bridge.

 

Dynamo Revit has successfully created the curved deck slopping down 5% in South View elevation.


To check the vertical elevation 30000mm at alignment highest point, and 26400 lowest point on bridge deck:

 

30000 - 72000*5/100 = 26400mm ü

 

where 72000mm is the input horizontal length of the bridge deck.



 

 

View WEWest & East view elevation.


3D Bridge using ICDAS Revit ensure the users correctness of the geometry.  Elevation East and Vest are automatically

created as two of many associated views from the 3D model. Levels on top of deck are precise the same values in the

Excel Corridor input.

 

 

 

 

View IFIsometry Front 3D view.



View ILIsometry Left 3D view.


In Revit default 3D view, the users can free orbit the model to control connections of all bridge elements from which all

2D sectional drawings are layout.

 

In point of design view in ICDAS Bridges, or any ICDAS model, the 2D sectional drawings are not of interest, since they

are created from the 3D model. One can easy create whatever section in Revit and take whatever dimension he/she needs

to know.

 

Most interesting in ICDAS Bridges using Dynamo Revit technology is that, you can store as many corridors in Excel input

as you wish. It is useful when engineers do often many works when the alignment of the bridge deck is changed, and to

compare the changes. ICDAS Dynamo will create the double curved deck immediately, for any selected corridor sheet in

Excel input.  

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View P1 to P3 shows dimensions and levels of the deck at the three piers from the 3D model. Elevations on deck are

the FUK elevation plus the outlined vertical distances. Further information for the contractors to build the bridge can

easily be created from the ICDAS Bridge model.

 


View B1: Bearing at Pier 1.


There are much more dimensions can be taken out from the model than shown in the above views.

In detail design, ICDAS will provide all necessary positions, elevations stored in the model.

 

Finally, it should be note that ICDAS Bridges experience also Revit Civil Structures 2017 which automate the bridge in

integration with Civil 3D. This method allows the users directly to design the pier(s) and abutments at a given station

overpass. 


However, Dynamo for bridge seem to be very interesting since the user work closed to the graphics and fast than ever. 


See 3D Rebar in this bridge deck with slope 0.1% alignment longitudinal.

 

 

123456789_123456789_1123456789 ICDAS  •  Hans Erik Nielsens Vej 3  •  DK-3650 Ølstykke  •   E-mail: th@icdas.dk   •  Tel.: +45 60 53 83 79  •  CVR no.: 34436169