Create a steel spiral beam

Tekla Structures
2018i
Tekla Structures
спиральная балка

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 beam 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 plane +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 toolbar 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 IFC 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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