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Examples: Rebar sets in curved structures

Last updated March 12, 2019 by Tekla User Assistance tekla.documentation@trimble.com

Software version: 
2019

Examples: Rebar sets in curved 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 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.

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 Concrete tab, click Rebar set > Create longitudinal rebars.
    2. Move the mouse pointer over the edges of the beam, and select the cross sectiongeometrical form of a part sectioned perpendicular to its axis

      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 polybeampart of a certain shape that is created as a continuous chain of beams passing through points that the user picks

The segments of the polybeam are straight, but segment intersections can be curved. For example, a beam that follows a zigzag line is a 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 theArc point chamfer type on the contextual toolbarfloating toolbar that contains commands for modifying the most common object properties

      The user can customize the contextual toolbar.

      The term mini toolbar is used in Tekla Structures until version 21.1.

      .
  2. Create crossing bars that follow the bottom and side faces of the beam.
    1. On the Concrete tab, click Rebar set > Create crossing rebars.
    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 guidelinedefinition of the distribution and direction of the reinforcing bars in rebar sets

      The spacing of the reinforcing bars is measured along the rebar set guideline. The rebar set guideline can be a line, or a polyline that may have corner chamfers.

      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 beambeam that follows the form of a helix and is defined by a start point, center point and the rotation axis

Spiral beams can be concrete spiral beams or steel spiral beams. They can be used to create spiral staircases, complex architectural structures, and concrete parking ramps, for example.

Spiral beam can rise from the work plane or be flat. If the spiral beam rises, the total rise is defined between the start and the end point.

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 Concrete tab, click Rebar set > Create longitudinal rebars.
    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 guidelinedefinition of the distribution and direction of the reinforcing bars in rebar sets

      The spacing of the reinforcing bars is measured along the rebar set guideline. The rebar set guideline can be a line, or a polyline that may have corner chamfers.

      .

    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, clickAdd 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 guidelinerebar set guideline that can be used in addition to the rebar set primary guideline to modify the geometry, direction, and spacing of reinforcing bars in a rebar set

      Rebar set secondary guidelines can be used to create curved reinforcing bars or to define a different spacing at the start and end of the rebar set reinforcing bars, for example.

      .
    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 guidelinerebar set guideline that is created automatically when a rebar set is created

      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 Concrete tab, click Rebar set > Create crossing rebars.
    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 pointsto the beam ends.

    3. Drag the guideline midpointto the beam midpoint.

    4. Ensure that the new guideline corner has theArc point chamfer.

    Tekla Structures arranges the crossing bars radially along the beam.

Limitations

  • If curved longitudinal bars have too small start and/or end offsetpart property that is used to move the ends of a part, relative to the part’s reference line

    values, the bars closest to leg faceplane that defines where the reinforcing bar legs are created in a rebar set

    Tekla Structures creates rebar set leg faces at the reinforced faces of concrete parts or pour objects, or according to the points picked when creating a rebar set.

    edges may be divided into small bar segments. To avoid this, increase the offset values.

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