Arch Rebar Helical

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Arch Rebar Helical.png Arch Rebar Helical

Menu location
Arch → Rebar tools
Default shortcut
See also
Arch Rebar
This command is part of the Reinforcement AddOn, that you can install via menu Tools → Addons Manager


The Arch Rebar Helical.png Helical Rebar tool allows user to create a helical reinforcing bar in the structural element.


How to use

  1. Create a structure element
  2. Select any face of the structure
  3. Then select Arch Rebar Helical.png Helical Rebar from the rebar tools
  4. A task panel will pop-out on the left side of the screen as shown below HelicalRebarDialog.png
  5. Select the desired orientation
  6. Give the inputs like front cover, right side cover, left side cover, bottom cover and diameter of the rebar
  7. Select the mode of distribution either amount or spacing
  8. If spacing is selected, a user can also opt for custom spacing
  9. Pick selected face is used to verify or change the face for rebar distribution
  10. Click OK or Apply to generate the rebars
  11. Click Cancel to exit the task panel


  • DATASide Cover: The distance between rebar to the curved face.
  • DATATop Cover: The distance between rebar from the top face of the structure.
  • DATABottom Cover: The distance between rebar from the bottom face of the structure.
  • DATAPitch: The pitch of a helix is the height of one complete helix turn, measured parallel to the axis of the helix.
  • DATADiameter: Diameter of the rebar.


The Arch Rebar Helical.png Helical Rebar tool can by used in macros and from the python console by using the following function:

makeHelicalRebar(SideCover, BottomCover, Diameter, TopCover, Pitch, Structure, Facename) 
  • Adds a Straight reinforcing bar object to the given structural object.
  • If no Structure and Facename is given, it will take user selected face as input.
  • Here CoverAlong argument is having type tuple.
  • Returns the new Rebar object.


Creating Helical rebar.

import Arch, Draft, HelicalRebar
# Creating circle
circle = Draft.makeCircle(radius=130.107647738,placement=pl,face=True,support=None)
# Creating Structure element from circle
structure = Arch.makeStructure(circle)
structure.ViewObject.Transparency = 80
# Creating Helical rebar
rebar = HelicalRebar.makeHelicalRebar(20, 50, 8, 50, 50, structure, "Face2") 

Changing properties of Helical rebar.

import HelicalRebar
HelicalRebar.editHelicalRebar(rebar, 20, 100, 12, 100, 100)