Cant create an Oval Staircase in AC21

[Anonymous]

Hi Guys,
Anyone know how to create an oval staircase? Ive tried everything including the magic wand, any tips?

Thanks,
Cain


https://imgur.com/a/kBrKY1w

[Barry Kelly · Accepted solution]

The only way I can get it to work is to not use an ellipse.
Stairs seem to only like a constant radius for the curves.

So can you re-create the ellipse with 3 arcs instead?
It will create a node at each of the arc end points.
You will need all of these stair nodes to be 'winders' with equal goings.
You might have to turn some of the rules off for things like max going length and max 2R+G so the stair fits the length of the arcs.

Barry.

[Anonymous]

Thanks Barry I will try this.

[Anonymous]

Hi Guys,

I thought I would give this a bump.

Im still unable the get the exact tread layout as per picture?

I can edit the stair treads to shape, however I lose the formation of the stringers(to shape with treads) and the function of the stair (becomes an object).

Thanks,
Cain

[Anonymous]

Update:

AC21 cannot do the elliptical shape i required, neither could Revit, ended up using Autocad and Sketchup.

[Hmooslechner]

Archicad makes some silly things at stringers by complex stairs. But there are other things that can be done about this: Use Profiles and Morphs. (Also maybe helpful - the use of the railingtool with the profilemanager.)

a try to get it working:

[Steve Jepson]

whatwaitnow wrote:
Update:

AC21 cannot do the elliptical shape i required, neither could Revit, ended up using Autocad and Sketchup.

Is it mandatory that you use the Stair Tool? Otherwise, any stair can be modeled with ArchiCAD exactly how you need it to be. You do not need to use any other programs.

[Anonymous]

Hmooslechner wrote:
Archicad makes some silly things at stringers by complex stairs. But there are other things that can be done about this: Use Profiles and Morphs. (Also maybe helpful - the use of the railingtool with the profilemanager.)

a try to get it working:

I could do an oval shape, just not the specific oval shape required for compliance and ascetics.

[Anonymous]

Steve wrote:

whatwaitnow wrote:
Update:

AC21 cannot do the elliptical shape i required, neither could Revit, ended up using Autocad and Sketchup.

Is it mandatory that you use the Stair Tool? Otherwise, any stair can be modeled with ArchiCAD exactly how you need it to be. You do not need to use any other programs.

Yeah much preferred to use the stair tool, so i could make small changes, ie, risers, widths without redoing the whole structure.

[Steve Jepson]

I understand. The Stair Tool is great for easily adjustable approximations, and sometimes that's all you need.