Examples: Rebar sets in curved structures

Tekla Structures
2021
Tekla Structures

Examples: Rebar sets in curved structures

You can reinforce curved concrete structures using rebar sets.

The curved concrete structures can include curved beams, polybeams that have Arc point chamfers, and flat spiral beams whose total rise is zero. You can also reinforce strip footings and wall panels the same way as you reinforce beams and polybeams.

For more information about creating rebar sets, see also Create a rebar set.

Create longitudinal bars for a curved beam

In this example, we will create longitudinal bottom bars for a curved concrete beam.

  1. Create a curved concrete beam.
    1. On the Concrete tab, click Beam.
    2. Pick two points.
    3. Double-click the beam to modify its properties.
    4. Set the radius and number of segments, and then click Modify.
  2. Create longitudinal bars at the bottom face of the beam.
    1. On the Rebar tab, click Longitudinal.
    2. Move the mouse pointer over the edges of the beam, and select the cross section that you want to reinforce.
    3. Click the middle mouse button to create the rebar set.

      Tekla Structures creates the curved longitudinal bars according to the beam geometry. For example:

      The rebar set has three guidelines: one at each end of the beam and one in the midpoint of the beam.

Create crossing bars for a curved polybeam

In this example, we will create crossing U-shaped stirrups for a curved concrete polybeam.

  1. Create a concrete polybeam with curved segments.
    1. On the Concrete tab, click Beam > Polybeam.
    2. Pick at least three points you want the beam to go through, and then click the middle mouse button.
    3. Select the polybeam.
    4. Select the handle in a polybeam corner, and then select the Arc point chamfer type on the contextual toolbar.
  2. Create crossing bars that follow the bottom and side faces of the beam.
    1. On the Rebar tab, click Crossing.
    2. Move the mouse pointer over the edges of the beam, and select the cross section that you want to reinforce.
    3. In the selected cross section, hold down Ctrl and click the top bar leg to unselect it.
    4. Click the middle mouse button to create the rebar set.

      Tekla Structures creates the crossing bars radially according to the beam geometry. For example:

      The rebar set guideline is a polyline with three points, and the midpoint has the Arc point chamfer.

Create reinforcing bars for a spiral beam

In this example, we will reinforce a spiral beam whose total rise is zero. We will create longitudinal bottom bars and crossing U-shaped stirrups.

You can use the following manual method also for more complex concrete objects that have been imported and that cannot be reinforced automatically.

  1. Create a flat spiral concrete beam.
    1. On the Concrete tab, click Beam > Spiral beam.
    2. Pick the start point of the beam.
    3. Pick a point to indicate the beam's center of curvature.
    4. Click the middle mouse button.
    5. Ensure that Total rise is 0.
  2. Create longitudinal bars at the bottom face of the beam.
    1. On the Rebar tab, click Longitudinal.
    2. Move the mouse pointer over the edges of the beam, and select the cross section that you want to reinforce.
    3. Click the middle mouse button to create the rebar set.

      Tekla Structures creates a longitudinal rebar set with one guideline.

    4. Press Esc to interrupt the command.
  3. Modify the longitudinal rebar set by creating more guidelines.
    1. Select the rebar set.
    2. On the contextual toolbar, click Add secondary guideline.
    3. Ensure that you are in the single point picking mode ( shown on the contextual toolbar).
    4. Pick the start point for a secondary guideline.
    5. Pick the start point for another secondary guideline.
    6. Press Esc to finish creating secondary guidelines.
    7. If needed, move the guidelines to desired locations by dragging them or their end point handles.

      For example, you can move the primary guideline to the midpoint of the beam, one of the secondary guidelines to the start of the beam, and the other secondary guideline to the end of the beam.

    8. Modify the geometry and properties of the guidelines as needed.

      The bars are constructed according to the locations and spacing settings of these three guidelines.

  4. Create crossing bars that follow the bottom and side faces of the beam.
    1. On the Rebar tab, click Crossing.
    2. Move the mouse pointer over the edges of the beam, and select the cross section that you want to reinforce.
    3. In the selected cross section, hold down Ctrl and click the top bar leg to unselect it.
    4. Click the middle mouse button to create the rebar set.

      Tekla Structures creates a crossing rebar set with one guideline.

    5. Press Esc to interrupt the command.
  5. Modify the crossing rebar set by modifying the guideline.
    1. Select the rebar set to highlight the guideline.
    2. Drag the guideline end points to the beam ends.

    3. Drag the guideline midpoint to the beam midpoint. Ensure that the new guideline corner has the Arc point chamfer.

      Alternatively, you can click on the contextual toolbar to make the guideline follow the leg face edges that are located between the guideline end points.

    Tekla Structures arranges the crossing bars radially along the beam.

Limitations

  • If curved longitudinal bars have too small start and/or end offset values, the bars closest to leg face edges may be divided into small bar segments. To avoid this, increase the offset values.
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