Modelling rebar in a culvert base

Tekla Structures
Not version-specific
Tekla Structures
concrete
rebar
detailing
Environment
United Kingdom

Question:
How can I model rebar in a culvert base?

Answer:
The following example will take you through the process of modelling the rebar step-by-step. 

Image
model-rebar-in-culvert-base-01.png

 

Example

The dimensions of the culvert box are 15500mm x 5500mm


Image
model-rebar-in-culvert-base-01b.png

Place the starter bars

We will start by placing the starter bars from the kickers in the B1 layer.
When modelling rebar it is best practice to model all the ranges in the same direction and use flexible last space to prevent odd spacing clashes.


Image
model-rebar-in-culvert-base-02.png

  1. From Concrete tab, hold Shift and select Rebar button. The Rebar group properties dialog opens
  2. Change the values as shown
Image
model-rebar-in-culvert-base-03.png


Note: It is important to stick to one Creation method when placing rebar.

Following the directions in the bottom left hand corner of Tekla Structures

  1. Pick the part to reinforce, select kicker wall (1)
  2. Pick points in order shown (2) + (3) + (4), point (4) can be picked anywhere along the line of the base
  3. Click middle mouse button to finish
Image
model-rebar-in-culvert-base-04.png

  1. Pick two points to indicate the range (1) + (2)
Image
model-rebar-in-culvert-base-05.png


The blue starter bars are inserted into the model.

Image
model-rebar-in-culvert-base-06.png


Let's repeat the process to create the alternate yellow bar. 
  1. From Concrete tab, hold Shift and select Rebar button. The Rebar group properties dialog opens
  2. Change the values as shown
Image
model-rebar-in-culvert-base-07.png


Note: The From plane starts 150 further on than the blue bar.
  1. Insert exactly the same way as before

The yellow starter bars are inserted into the model.

Image
model-rebar-in-culvert-base-08.png



Create on opposite side

Let's repeat the process for the other side.
  1. Double click the existing blue rebar group to load the Rebar group properties dialog
  2. From Concrete tab, select Rebar button

Insert the same way as before but on the opposite side.

  1. Pick the part to reinforce, select kicker wall (1)
  2. Pick points in order shown (2) + (3) + (4), point (4) can be picked anywhere along the line of the base
  3. Click middle mouse button to finish
Image
model-rebar-in-culvert-base-09.png
  1. Pick two points to indicate the range
  2. Repeat the process to create the alternate yellow bar, remember to select the existing yellow bar to load the correct Rebar group properties

The opposite start bars are inserted into the model. 

Image
model-rebar-in-culvert-base-10.png


The bars will be populated to the same rules but the geometry can update to suit the orientation and profile.


Stagger bars alternately

Let's swap the From plane bar values on the right hand side around, so that the bars stagger alternately to those on the left.
  1. Double click the blue rebar group to load the Rebar group properties dialog
  2. Swap the From plane value from 75.00 to 225.00, click Modify
  3. Double click the yellow rebar group to load the Rebar group properties dialog
  4. Swap the From plane value from 225.00 to 75.00, click Modify
Image
model-rebar-in-culvert-base-11.png


The bars are now staggered.

Image
model-rebar-in-culvert-base-12.png



Placing B1 longitudinal bars

Now we will place the B1 longitudinal bars. We have hidden the starter bars for clarity.

Image
model-rebar-in-culvert-base-13a.png

  1. From Concrete tab, hold Shift and select Rebar button. The Rebar group properties dialog opens
  2. Change the values as shown
Image
model-rebar-in-culvert-base-13.png

Following the directions in the bottom left hand corner of Tekla Structures

  1. Pick the part to reinforce, select the base (1)
  2. Pick points in order shown (2) + (3) and click middle mouse button to finish
Image
model-rebar-in-culvert-base-14.png
  1. Pick two points to indicate the range (1) + (2)
Image
model-rebar-in-culvert-base-15.png


The red longitudinal bars are inserted into the model.
Image
model-rebar-in-culvert-base-16.png


Let's repeat the process to create the grey longitudinal bars.
  1. From Concrete tab, hold Shift and select Rebar button. The Rebar group properties dialog opens
  2. Change the values as shown
Image
model-rebar-in-culvert-base-17.png

  1. Insert exactly the same way as you did for the red bars

The grey longitudinal bars are inserted into the model.

Image
model-rebar-in-culvert-base-18.png


Placing B2 bars

Now we will model in the B2 bars.

Image
model-rebar-in-culvert-base-19a.png

  1. From Concrete tab, hold Shift and select Rebar button. The Rebar group properties dialog opens
  2. Change the values as shown
Image
model-rebar-in-culvert-base-19.png


Note: To draw a staight bar of a fixed length we set Start and End values to 0, then the bar is as long as the points we pick.

The start cover is achieved by using the Ctrl key to start 50mm (cover distance) from the face.

Following the directions in the bottom left hand corner of Tekla Structures

  1. Pick the part to reinforce, select the base (1)
  2. Hold down Ctrl and select the first point (2)
  3. Move your mouse in the direction you want your point to be and type 50, the Enter a Numeric Location dialog opens, click OK

The point is added 50mm from the face (3).

Image
model-rebar-in-culvert-base-20.png
  1. Move your mouse in the direction you want your point to be, it should snap to the line of the base
  2. Type 6000, the Enter a Numeric Location dialog opens, click OK, The point is added 6000mm from the face (2).
  3. Click middle mouse button to finish

Image
model-rebar-in-culvert-base-21.png
  1. Pick two points to indicate the range (1) + (2)
Image
model-rebar-in-culvert-base-22.png


The green B2 bars are inserted into the model.

Let's repeat the process to create the brown B2 bars.

  1. From Concrete tab, hold Shift and select Rebar button. The Rebar group properties dialog opens
  2. Change the values as shown
Image
model-rebar-in-culvert-base-23.png

  1. Insert exactly the same way as you did for the green bars, using the Ctrl method

The brown B2 bars are inserted into the model.

Image
model-rebar-in-culvert-base-24.png



Copy and stagger bars alternately

  1. Select the two groups
  2. Right click and Copy special > Linear

The Copy - Linear dialog opens.

  1. Change the values as shown, click Copy
Image
model-rebar-in-culvert-base-25.png


The groups copy linear.
Image
model-rebar-in-culvert-base-26.png

  1. Double click the middle green rebar group to load the Rebar group properties dialog
Image
model-rebar-in-culvert-base-27a.png

  1. Increase the From plane value by 20mm, Click Modify
Image
model-rebar-in-culvert-base-28.png

  1. Double click the middle brown rebar group to load the Rebar group properties dialog
  2. Increase the From plane value by 20mm, Click Modify
Image
model-rebar-in-culvert-base-27.png


The bars are now staggered.

Image
model-rebar-in-culvert-base-29.png



Trim rebar

  1. Select the green bar, a pink handle will appear
  2. Right click, select Move
  3. Pick the origin for moving (1)
  4. Pick the destination point (2)

Image
model-rebar-in-culvert-base-30.png


  1. Double click the green rebar group to load the Rebar group properties dialog
  2. Edit the End cover to 50mm, click Modify
Image
model-rebar-in-culvert-base-31.png

  1. Select the brown bar, a pink handle will appear
  2. Right click, select Move
  3. Pick the origin for moving (1)
  4. Pick the destination point (2)
Image
model-rebar-in-culvert-base-32a.png

  1. Double click the brown rebar group to load the Rebar group properties dialog
  2. Edit the End cover to 725mm (675+50), click Modify

The rebar is now cut back.

Image
model-rebar-in-culvert-base-32.png



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