topic Re: Intersection Issues in Modeling

Intersection Issues

Anonymous — Wed, 24 May 2023 06:55:58 GMT

Hello, I'm having a bit of a problem with AC17 and wall intersections.

I have set on both walls the exterior skin as finish and the interior as core. It only has a problem in one situation (with red circle) I wanted it to stop before the exterior skin.

Is there anything I can do to solve this?

Thanks

Re: Intersection Issues

shtarkel — Mon, 20 Oct 2014 09:53:13 GMT

Hi, you can watch this video and say if it did the trick - https://www.youtube.com/watch?v=E_g9r3PELO0

Re: Intersection Issues

Anonymous — Mon, 20 Oct 2014 10:15:33 GMT

Maybe I'm not getting how this works, but the finish on both sides of the wall (plaster) is the same. I can't make plaster higher priority than the brick core otherwise brick will stop at the plaster right?

Re: Intersection Issues

shtarkel — Mon, 20 Oct 2014 10:20:51 GMT

Paste here the settings you use for all the materials from the building material's menu and give colour screen shot of the problem.

Re: Intersection Issues

Anonymous — Mon, 20 Oct 2014 10:33:23 GMT

Here you go:

Re: Intersection Issues

Anonymous — Mon, 20 Oct 2014 10:35:58 GMT

Sorry couldn't send all images:

https://www.dropbox.com/s/q3tctdyyce70ewk/Capture%20d%E2%80%99%C3%A9cran%202014-10-20%20%C3%A0%2012.34.07.png?dl=0

Re: Intersection Issues

shtarkel — Mon, 20 Oct 2014 12:33:14 GMT

020_1 is your skin right? Give it intersection priority of 610.

Re: Intersection Issues

Anonymous — Mon, 20 Oct 2014 12:40:58 GMT

If I do that, no core will intersect correctly:

Re: Intersection Issues

sinceV6 — Mon, 20 Oct 2014 14:17:45 GMT

Hi.
While it is always a good practice to give the wall core the highest priority -so you don't have issues- and work outward from there giving the outer skins less priority, in the case of external finishes, it is advised to have two different plaster materials, giving the outer one a bigger priority -maybe even higher than the core- so that other skins won't cut it.

As for insulation and air-spaces inside walls, while you would think they would need a lesser priority (as in insulation is less strong than concrete, right?) you would want it to have a bigger number so that it is a continuos skin.

Hope that makes sense.

Best regards.

Re: Intersection Issues

shtarkel — Mon, 20 Oct 2014 14:21:17 GMT

Try making two different materials for inside and outside of the building. So no core can get trough the outside one but the inner intersect correctly

Re: Intersection Issues

Anonymous — Mon, 20 Oct 2014 14:39:04 GMT

But neither side is an exterior finish, it's both sides of an interior wall and I might have wall intersections on both sides ... For now I solved it by giving brick and insulation the same priority ... but it's a bit of a hack. I thought this situation was a thing that happend often so I thought there was a standard way to do it.

Re: Intersection Issues

Laszlo Nagy — Mon, 20 Oct 2014 17:39:37 GMT

The issue you are raising in your post is unfortunately a problem that stems from the fact that you need one skin to be stronger than another at one intersection, and then at another intersection you need the second skin to be stronger than the first one.

The way I normally handle such intersections is that I create the intersection profile out of a Complex Profile Column.

Re: Intersection Issues

Laszlo Nagy — Mon, 20 Oct 2014 17:45:11 GMT

Then place the Profiled Column at the intersection.
Make sure it is the same height as the Walls.

Also make sure to shorten the Wall coming from the right so that it butts against the right side of the Column and does not intersect the vertical Wall. Then both the 2D and 3D will look right.

I selected the horizontal Wall on the Floor Plan and the Column in 3D so you can see how they are placed.

I think this Column workaround will work in most cases when you have such Wall joint situations that cannot be handled by the Priority-Based Intersection logic.

Re: Intersection Issues

shtarkel — Mon, 20 Oct 2014 17:47:09 GMT

Thanks, interesting work around!

Re: Intersection Issues

Anonymous — Tue, 21 Oct 2014 06:04:07 GMT

Thank you for answering! I will try your solution, for now making the insulation and the brick the same priority works too.

I was thinking that these problems were user error, because this is a common situation on my projects and I was expecting AC17 to solve it!

Re: Intersection Issues

LucaP — Wed, 31 Oct 2018 12:54:48 GMT

Hi,

First of all sorry for bringing back this old post, but I have some unanswered question about the 'workaround' suggested here and it keeps bugging me.

I've been using the solution with complex profile column for complicated intersections in walls, but I keep wondering - how one is able to schedule properly wall components when using such solution?

I would like to schedule each component of structural element (i.e. vertical surface of brick core of a wall, which is 24cm thick), but when I use column for these intersection I am no longer able to do that.

I wanted to ask what is the common practice for this. Do you ignore it (within some tolerances) or do you create separate schedule for these objects? And if so do you schedule material by volume and then divide by known thickness?

P.S. That's my first post here so big 'Hello' to everybody

Re: Intersection Issues

Anonymous — Thu, 04 Apr 2019 09:24:03 GMT

Hello. Thank you very much. My collegue is trying to find the best hierarchy for the priorities. This is not easy, because we have double walls between the apartments for acoustics, one being structural, the other one not. She already proposed me the idea of profiles, but of course I would prefer not to add additional items. She's now trying with priorities, if she doesn'st find, I will try in a very simple project. I will update the sitution. Hello from Europe!