Arch Rebar Stirrup

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Arch Rebar Stirrup.svg Arch Rebar Stirrup

Menu location
Arch → Rebar tools
Arch, BIM
Default shortcut
Introduced in version
See also
Helical Rebar, Arch Rebar


The Stirrup Rebar tool allows the user to create a set of stirrup reinforcing bars inside an Arch Structure object.

This command is part of the Reinforcement Addon, that you can install with the Addon Manager, via the menu Tools → Addon manager → Reinforcement.

Arch Rebar Stirrup example.png

One set of stirrup reinforcement bars inside an Arch Structure object

How to use

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


Taskview panel for the Arch Rebar Stirrup tool


  • DATAFront Cover: The distance between rebar and selected face.
  • DATARight Cover: The distance between the right end of the rebar to right face of the structure.
  • DATALeft Cover: The distance between the left end of the rebar to the left face of the structure.
  • DATABottom Cover: The distance between rebar from the bottom face of the structure.
  • DATATop Cover: The distance between rebar from the top face of the structure.
  • DATABent Angle: Bent angle defines the angle at the ends of a stirrup.
  • DATABent Factor: Bent Factor defines length of stirrup end.
  • DATAAmount: The amount of rebars.
  • DATASpacing: The distance between the axes of each bar.


See also: Arch API, Reinforcement API and FreeCAD Scripting Basics.

The Stirrup Rebar tool can be used in macros and from the Python console by using the following function:

Rebar = makeStirrup(l_cover, r_cover, t_cover, b_cover, f_cover,
                    bentAngle, bentFactor, diameter, rounding, amount_spacing_check, amount_spacing_value,
                    structure=None, facename=None)
  • Creates a Rebar object from the given structure, which is an Arch Structure, and facename, which is a face of that structure.
    • If no structure nor facename are given, it will take the user selected face as input.
  • l_cover, r_cover, t_cover, b_cover, and f_cover are inner offset distances for the rebar elements with respect to the faces of the structure. They are respectively the left, right, top, bottom, and front offsets.
  • diameter is the diameter of the reinforcement bars inside the structure.
  • rounding is the parameter that determines the bending radius of the reinforcement bars as they make a loop.
  • bentLength and bentAngle define the length and angle of the tip of the reinforcement loop.
  • amount_spacing_check if it is True it will create as many reinforcement loops as given by amount_spacing_value; if it is False it will create reinforcement loops separated by the numerical value of amount_spacing_value.
  • amount_spacing_value specifies the number of reinforcement loops, or the value of the separation between them, depending on amount_spacing_check.


import Draft, Arch, Stirrup

# It doesn't work if the structure is not based on a face
# Structure = Arch.makeStructure(length=1000, width=400, height=400)

Rect = Draft.makeRectangle(400, 400)
Structure = Arch.makeStructure(Rect, height=1600)
Structure.ViewObject.Transparency = 80

Rebar = Stirrup.makeStirrup(20, 20, 20, 20, 20,
                            115, 4, 8, 2, True, 10, Structure, "Face6")

Edition of the rebar

You can change the properties of the rebar with the following function

editStirrup(Rebar, l_cover, r_cover, t_cover, b_cover, f_cover,
            bentAngle, bentFactor, diameter, rounding, amount_spacing_check, amount_spacing_value,
            structure=None, facename=None)
  • Rebar is a previously created StirrupRebar object.
  • The other parameters are the same as required by the makeStirrup() function.
  • structure and facename may be omitted so that the rebar stays in the original structure.
import Stirrup

Stirrup.editStirrup(Rebar, 20, 20, 20, 20, 50,
                    100, 4, 14, 8, True, 8)