topic Re: T Junction Connection in Documentation

T Junction Connection

liVIDO — Wed, 10 May 2023 09:24:34 GMT

Hi, I know it's a typical topic but I really need to work this out. I'm trying to solve these junctions. Top left and right corner: i can solve it by increasing the material priority of insulation ok but it will mess up the bottom left T junction. I don't want to create and insulation with a stronger material priority of the concrete, it seems stupid. And I don't wanna create two different insulation material with different material priorities as too because it will create unnecessary lines. Why does archicad not use core and finishes priority as well? it would make these kind of connection so much easier.

Re: T Junction Connection

Barry Kelly — Wed, 12 Apr 2023 00:55:04 GMT

The outer skin needs to be the strongest material.

The insulation slightly weaker but it must be stronger than your concrete (diamond hatch) and brick (diagonal hatch).

The concrete and the brick you can decide which is stronger than the other, but both must be weaker than the insulation.

The inner plaster skin must be weaker than all of them.

Barry.

Re: T Junction Connection

liVIDO — Wed, 12 Apr 2023 06:12:46 GMT

thanks Barry! i appreciate your help. i’ve already tried it but if i do so, i’m the bottom left corner i’ll end up with the insulation interrupting the brick layer, i don’t want that. so i tried creating a new insulation material with a different priority but it will create new unwanted lines were the two different insulations get in in touch, in particular on the mid-bottom conjunction wall.

Re: T Junction Connection

Barry Kelly — Wed, 12 Apr 2023 06:26:08 GMT

Sorry, I missed that bottom corner.

I don't have your exact walls setup, but try playing around with the junction order to see if that will help.

See here, same wall, different junction orders.

Barry

Re: T Junction Connection

liVIDO — Wed, 12 Apr 2023 06:30:44 GMT

thank you! this night i’ll try! does it matter were i put the reference line?

Re: T Junction Connection

Barry Kelly — Wed, 12 Apr 2023 06:34:34 GMT

It shouldn't.

Barry

Re: T Junction Connection

liVIDO — Thu, 13 Apr 2023 05:29:48 GMT

Hi Barry! thanks for the help. I've tried as you sad, I've set every building material priority to the same value and work with the priority junction. I've managed some how but the plaster keeps causing trouble with different composite walls. any idea how can I fix this?

ps: it's a little work around for the plan but if I switch to an elevation, setting every material priority to the same is gonna cause trouble

Re: T Junction Connection

Barry Kelly — Thu, 13 Apr 2023 07:42:48 GMT

I am not sure what you mean by "I've set every building material priority to the same value".

You still need stronger/weaker building materials.

That should work in most cases.

Then in those that don't, try adjusting the junction order.

I am not sure why that one line is extending through your insulation skin.

Sometimes it is just not possible for every junction to trim as you want it.

Then you can 'cheat' and add a complex profile column (with the fills arranged as you want them to be) to the junction.

Barry.

Re: T Junction Connection

liVIDO — Thu, 13 Apr 2023 08:52:24 GMT

junction order works just if the materials have the same intersection priority. I've tried a combination of every possibility but setting the same material priority and working with the junction priority as you suggested worked the best. it seems it's a limitation of the software when you're working with different composite wall which have multiple material with different priorities.

Re: T Junction Connection

Barry Kelly — Thu, 13 Apr 2023 09:03:37 GMT

The image I posted before, the building materials all have different strengths.

Actually the external cladding and the insulation skins are the same strengths - I am not sure if that is important or just the way it worked out.

Barry.

Re: T Junction Connection

liVIDO — Thu, 13 Apr 2023 09:07:32 GMT

ok but you’re using a single type of composite wall, i’m trying to achieve your result with three different kind of composite wall, am i wrong? thanks for helping me by the way

Re: T Junction Connection

Barry Kelly — Thu, 13 Apr 2023 09:13:38 GMT

Your image only shows 2 different walls? - diagonal hatch and diamond hatch.

Only those internal skins are different - the outside skins look the same for all?

If you want you can save a file with just those walls as you show them and attach it here (you may need to zip the file).

Then when I get a chance I can have a look and work with exactly what you have.

Barry.

Re: T Junction Connection

liVIDO — Thu, 13 Apr 2023 09:20:57 GMT

wow thank you! here the file

Re: T Junction Connection

Barry Kelly — Fri, 14 Apr 2023 02:45:24 GMT

OK, I had a look at the file - thanks for sending.

The junction order helps a bit - the higher junction order will dominate the lower ones.

So just changing that you will get this.

Whether you have two wall or one continuous wall along the top will not matter.

The horizontal brick walls just need a higher junction order than the vertical wall.

However, if you want the concrete (vertical wall) to cut the brick (horizontal) wall, then you need to play with the strengths of the building materials.

Concrete needs to be stronger than the brick and the insulation needs to be stronger than the concrete so the insulation does not get cut.

But then this create a problem when you have 3 walls all with insulation - the insulation is strong and will cut other skins.

So you have to create a new insulation material that is weaker and also create new composite wall that uses that weaker insulation (i.e 'brick wall - strong insulation' and another composite 'brick wall - weak insulation').

Now use the weak wall when you want it to be cut.

Or to save doing that, just control how the walls are cut - overriding the automatic trimming.

You may have to re-trim every time you move or edit a wall as it will automatically trim to the reference line of the other walls when you edit it.

You can also place them in different layers with different intersection group numbers and they will not trim with each other.

But then another problem you will have is the plaster skin will not be cut as the walls are not trimming to each other any more.

Display order can help with that.

Although now the walls are not trimming, even the same building materials will not join.

It really does get quite complicated depending on the walls you want to trim.

You may not have all of these situations in the same job so you will not notice any problems or you can solve it with building material strengths and junction order.

But then you have a different connection that throws the hole thing out.

You need to make new building materials, new composites.

And as I mentioned before, complex profile columns can help.

Barry.

Re: T Junction Connection

Eduardo Rolon — Mon, 17 Apr 2023 12:07:09 GMT

Still relevant 13 years later for these cases:

https://www.onland.info/archives/2010/07/fixing_wall_corners_with_columns.php