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Create a steel spiral beam

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

Software version: 
2019

Create a steel spiral beam

Create a steel spiral beam

Use the Create steel spiral beam command when you want to model spiral staircases and complex architectural shapes, for example.

Basic concepts related to spiral beams

The images below illustrate some basic concepts related to the creation of spiral beams. Note that if you change the positioning, the entire geometry of the 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.

changes.

(1) Start point (the first point picked)

(2) Center point (the second point picked)

(3) Direction of the rotation axis (the optional third point picked)

(4) Center axis

(5) Total rise: the distance from the start point to the end point, parallel to the center axis

(6) Rotation angle: the rotation angle of the spiral beam, given in degrees. Note: positive value = counter-clockwise rotation, negative value = clockwise rotation.

(7) Radius: the distance from the start point to the center point, perpendicular to the center axis

Create a spiral beam

  1. On the Steel tab, click Beam > Spiral beam.
  2. Pick the start point.

  3. Pick the center point.

  4. To set the rotation axis in the work planeplane that the user has chosen in a model and that is currently active for working on in a model view

    Newly created, copied, or moved model objects comply with the work plane. For example, shifting the work plane to follow a sloped plane makes it easier to model sloped structures.

    +Z direction, click the middle mouse button to finish.


    Note:

    Alternatively, instead of clicking the middle mouse button, you can pick a second center axis point to define the direction of the rotation axis.

    Tekla Structures creates the spiral beam. For example:

  5. Click the spiral beam to select it.

    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.

    appears with the following options:

    (1) Rotation angle

    (2) Total rise

    (3) Twist angle at start

    (4) Twist angle at end

  6. To add more rotation, enter a bigger value in the Rotation angle box.
  7. To make the spiral more loose, enter a bigger value in the Total rise box.
  8. To change the radius, move the start point or center point.

Limitations

  • Spiral beam has a single, constant radius.
  • Unfolding of spiral beams whose total rise is larger than 0.00 does not produce completely straight results in drawings. The amount of deviation in the part profile outlines and part length depends on several factors: the type, size, and length of the profile; the amount of total rise; and the amount of rotation angle and detailing used.
  • Spiral beams are not always untwisted in unfolding. If unequal twisting is applied to the start end and end end, the unfolded drawing shows an unfolded but twisted part as a result.
  • Connections and details may not work as expected with spiral beams.
  • DSTV export of spiral beams may not produce a correct result.
  • You cannot export spiral beams as parts in IFCfile format commonly used in BIM that facilitates software interoperability

    IFC is an open specification developed by the IAI (International Alliance for Interoperability).

    Model can be exported into an IFC file.

    export. If you are modeling cast-in-place structures with spiral beam, you can export the geometry to IFC as pour objects.

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