topic Re: Wall and Slab Intersection in Section in Modeling

Wall and Slab Intersection in Section

Anonymous — Thu, 25 May 2023 15:53:27 GMT

How can I make a Wall and a Slab intersect properly in section?

I made a compposite wall and a composite slab with the same priorities and fills and I have "Enable Skin Priorities" switched on.

In the section window they intersect proprly only when the Slab touches the Wall. When the Slab touches the inner Composite's line they do not intersect at all!

Re: Wall and Slab Intersection in Section

Anonymous — Wed, 19 Mar 2008 18:04:33 GMT

AFAIK it's still not possible to have composite floors intersect properly in ArchiCAD.

It would be a nice improvement to get easier 3D models...
I think Revit already does so

Re: Wall and Slab Intersection in Section

Laszlo Nagy — Thu, 20 Mar 2008 11:16:44 GMT

Here is an article related to the topic found on Archicadwiki:
http://www.archicadwiki.com/TechNotes/Wall-Slab_Intersections

Re: Wall and Slab Intersection in Section

Djordje — Fri, 21 Mar 2008 08:44:31 GMT

You could also place the beam within the wall - as it really would be a beam, not necessarily a part of the slab. With the same cut fills, it would clear up?

Re: Wall and Slab Intersection in Section

Anonymous — Fri, 21 Mar 2008 14:05:45 GMT

Thank you for your suggestions! It is sad I already know them but don't like them! SEO is fine, but its more work! Beam is the right solution but it takes even mote time to model and I usually don't have a lot of time!
Here is a typical building detail I model (and draw!) in 90% of my projects. It is reinforced concrete structure with slabs without beams and brick walls with outside thermal insulation. All suggestions are welcomed!

Re: Wall and Slab Intersection in Section

Laszlo Nagy — Fri, 21 Mar 2008 17:08:42 GMT

I am struggling with the same problem. We probably have many similar structures in Hungary and Bulgaria.
I usually model only the Slab structure in the inside of the building. Then I place the rest of the floor as 2D in the Sections where they are visible.
I also model the exterior floor structures (e.g. floor structure of a balcony) using a separate Slab. I could not come up with a better solution yet.

Re: Wall and Slab Intersection in Section

Anonymous — Sat, 22 Mar 2008 11:35:47 GMT

Djordje wrote:
You could also place the beam within the wall - as it really would be a beam, not necessarily a part of the slab. With the same cut fills, it would clear up?

I totaly agree with Djordje. We are doing BIM or what?...
I only use this kind of detail in CD drawings...
In the concept phase I use a special template where I use generic composites for slabs, walls and roofs...
I also make the slab inside the building like Laszlonagy does, but without 2d patch in section.
So... When I need to detail the model I just detail the generic composites changing them with the attribute manager,
and then I place the beams with the thickness of the concrete slab.
For me it works like a charm.

Re: Wall and Slab Intersection in Section

Anonymous — Sun, 23 Mar 2008 09:00:01 GMT

Braza, you did not read my explanation! It is "reinforced concrete structure with slabs without beams". Perhaps there is another term for it in English but it is still the same - no visible beams, so no beams need to be drawn separately!

Laszlo, you mean that an (ex)Hungarian CAD company does not offer a way to model a typical building detail, used in Hungary?!
Perhaps, if you ask them in Hungarian they will hear you/us? 😉
I model the slab according to the outside boundary of the masonry, as shown on the plan snapshot, because this is the slab contour I send the Structural Engineer. On this slab I show all the holes for installations - electrical, water, sewage, etc., so it must be drawn correctly.
I do not use a separate slab for balconies when I have a structure without beams, because the slab and floor thickness are practically the same. I only model a separate slab when I have a structure with slabs and beams and the balcony slab is thinner than the floor slab.

Re: Wall and Slab Intersection in Section

Laszlo Nagy — Sun, 23 Mar 2008 10:55:08 GMT

kliment wrote:
Laszlo, you mean that an (ex)Hungarian CAD company does not offer a way to model a typical building detail, used in Hungary?!
Perhaps, if you ask them in Hungarian they will hear you/us? 😉

Yes, I told them. They know about it.
You know it is this kind of game: we users tell them things we need, and they will need to consider when and how to implement them, and set priorities of which features they believe are the most important. Of course, this is many time does not agree with what we think is important.

Re: Wall and Slab Intersection in Section

Anonymous — Sun, 23 Mar 2008 11:33:30 GMT

I'm not sure if this is what you mean.... please see attached
Is this junction OK? If not please tell me whats wrong

Re: Wall and Slab Intersection in Section

Laszlo Nagy — Sun, 23 Mar 2008 11:34:42 GMT

No attachment attached.

Re: Wall and Slab Intersection in Section

Anonymous — Sun, 23 Mar 2008 11:37:57 GMT

So I see
I'll try again

Re: Wall and Slab Intersection in Section

Laszlo Nagy — Sun, 23 Mar 2008 11:42:15 GMT

I guess your illustration is different from what Kliment is trying to achieve.
He has addition skins ABOVE the Slab's structure which he wants to not cut into the Wall. This is not possible to do right now, as far as I know.

Re: Wall and Slab Intersection in Section

Anonymous — Sun, 23 Mar 2008 11:53:10 GMT

How about this
I promise only a wall and a slab

Re: Wall and Slab Intersection in Section

Laszlo Nagy — Sun, 23 Mar 2008 11:59:23 GMT

How is that accomplished?

Re: Wall and Slab Intersection in Section

Anonymous — Sun, 23 Mar 2008 12:08:34 GMT

The wall is a complex, it finishes at the underside of the concrete part of the slab and has a return to the inside face of the wall and has another wall below. You can see the slightly different background fill colour of the concrete. The wall is brought to the front so the other wall fills hide the top and bottom finishes of the slab
So the return (horizontal) part of the wall visually joins with the slab

Re: Wall and Slab Intersection in Section

Laszlo Nagy — Sun, 23 Mar 2008 12:30:52 GMT

Now I am confused, because I do not know how many Walls are there.
So, a couple of questions:
1. The Walls are single-story or multi-story (I guess single-story). Maybe you could number the Walls for us.
2. Is there one Wall or two Walls on one story on the attached picture?
3. Does the body of the Slab reach into the masonry Wall?
4. Is any of the Walls SEO-subtracted by the Slab?
5. Is the Slab SEO-subtracted by any of the Walls?

Re: Wall and Slab Intersection in Section

Anonymous — Sun, 23 Mar 2008 22:46:15 GMT

1. The Walls are single-story or multi-story (I guess single-story). Maybe you could number the Walls for us.
See new picture
2. Is there one Wall or two Walls on one story on the attached picture?
One
3. Does the body of the Slab reach into the masonry Wall?
Yes
4. Is any of the Walls SEO-subtracted by the Slab?
No
5. Is the Slab SEO-subtracted by any of the Walls?
No

The walls are in front of the slab... I have moved the walls apart vertically for the picture

Re: Wall and Slab Intersection in Section

Laszlo Nagy — Mon, 24 Mar 2008 01:00:41 GMT

Hm, interesting solution, but it works.
Now, there is only one question left: what if the outer edge of the Slab aligns with the outer edge of the structure of the Wall. This is a situation I encounter often. I will not to do it that way because I need to export the Slab contour to the structural consultant.

Re: Wall and Slab Intersection in Section

Anonymous — Mon, 24 Mar 2008 01:53:36 GMT

Laszlo
Now you're really testing me
give me 5 mins