Modelling rebar in a culvert base


Software version: Not version-specific

Last updated June 5, 2018 by Trimble Solutions UK tekla.support.uk@trimble.com

Environment: 
United Kingdom

Modelling rebar in a culvert base

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. 


 

Example

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


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.

  1. From Concrete tab, hold Shift and select Rebar button. The Rebar groupgroup of reinforcing bars that are side by side and have identical properties, except the possible variation in bar lengths

    properties dialog opens
  2. Change the values as shown

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 wallplate that represents a structure such as a wall or roof panel

    In Tekla Structures, a panel is created by picking two or more points.

    In cast-in-place concrete the term wall refers to a concept similar to panel.

    (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


  1. Pick two points to indicate the range (1) + (2)

The blue starter bars are inserted into the model.

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

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.

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


  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. 

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

The bars are now staggered.

Placing B1 longitudinal bars

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

  1. From Concrete tab, hold Shift and select Rebar button. The Rebar group properties dialog opens
  2. Change the values as shown

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


  1. Pick two points to indicate the range (1) + (2)

The red longitudinal bars are inserted into the model.

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


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

The grey longitudinal bars are inserted into the model.

Placing B2 bars

Now we will model in the B2 bars.

  1. From Concrete tab, hold Shift and select Rebar button. The Rebar group properties dialog opens
  2. Change the values as shown

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).


  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


  1. Pick two points to indicate the range (1) + (2)

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


  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.

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

The groups copy linear.

  1. Double click the middle green rebar group to load the Rebar group properties dialog


  1. Increase the From plane value by 20mm, Click Modify


  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

The bars are now staggered.

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)

  1. Double click the green rebar group to load the Rebar group properties dialog
  2. Edit the End cover to 50mm, click Modify


  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)


  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.

Tags: 
concrete
rebar
detailing

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