footing eccentricity

[cr_gixxer]

I'm having an issue with footings when I alter the eccentricity.

I have a concrete foundation wall will a rigid insulation finish. I want the footing to be centered on the concrete portion only, and not the entire thickness of the wall. Therefore, I adjust the eccentricity of the footing to center it, but the joins at the ends of walls are off, and I can't seem to align them properly.

any suggestions/workarounds?

thanks

[Craig_L]

This is another great example of how combination walls mess with your structural team.
Personally, I hate them, and request architects don't use them on projects because there are myriad of little complications they cause, and this is one of them.

I think there may be a setting in your combination wall to set a particular layer as "core" and this may resolve your problem, if you go into "edit type" and click on structure - "edit"
you may be able to set the proper element as the core, and the footing tool may recognise this as the "centre" of your wall, I can't test it as I dont have a combination wall family in my library so I can't be 100% sure this will resolve the problem with the associated wall footing tool.

You would have to model the strip footing as an "isolated footing" rather than using the wall footing tool, as this then allows you to laterally move the footing. The wall footing tool is great for quickly adding a footing to a simple wall but if it needs to be off-centre isolated is the way to go, but if you're sharing this model with another team I suggest to you that combination walls make almost everyone's life harder, except for the architect.

[cr_gixxer]

The "core" is as it should be, but the footing stills centers itself over the overall dimension of the wall. the isolated option kinda works , but with the predetermined length, it gets cumbersome to place them.

how the heck do you not use combination walls? Whats the point of bim if you are modelling a generic wall, and I assume, sketching over top for sections etc.......might as well be using cad

[cr_gixxer]

looks like for walls @ 90 deg, you just have to pull the footing away a few feet past the perpendicular wall and then align it back.

I have some walls @ 45 deg. though, and can't seem to get it to work

[Craig_L]

The "core" is as it should be, but the footing stills centers itself over the overall dimension of the wall. the isolated option kinda works , but with the predetermined length, it gets cumbersome to place them.

how the heck do you not use combination walls? Whats the point of bim if you are modelling a generic wall, and I assume, sketching over top for sections etc.......might as well be using cad

It's easy to not use combination walls. If you're doing a collaborative model, you allow the structural team to model the 'structural' component, or core, and from there you know where your linings go. This works very well for face based elements as you're placing them on your lining and not on the structural wall, so it's quite easy to manipulate changes to your wall completely independent of the structural component, which may change throughout the life of documentation. This allows both of you to work independently of each other, which in collaborative projects is a big plus rather than having to wait on either, someone to release the element so you can edit it, or a co-ordination review so that the wall updates to how it should now look after changing, so you can continue adding whatever you need to.

Essentially you are still modelling all the elements of the wall, I don't even know if combination walls allow for accurate scheduling, I assume they would but I've never bothered trying. Also, as you've discovered, other tools (like the wall footing tool) hate combination walls. In alot of ways I prefer using isolated footings, as you can lock them to a 'footing depth' reference plane, rather than relying on your wall being set to the correct depth, and not having its profile edited which also screws with the wall footing tool I might add. It not really that hard to make your 'combination wall' not contain a core at all, and model a core piece separately. In essence, you leave a void in your combination wall big enough to allow a seperate "core" element to be placed in there. Trust me, that if you are working in a collaborative model, your structural team will thank you for the extra 30 seconds worth of effort, setting up a core element in there for them.

Graphically, combination walls are hard to manipulate. Structurally we don't care about a wall lining, a void for top hats, or insulation, it just isnt needed on structural documentation. The purpose of the BIM model for collaboration is to make life easy for all disciplines involved, and I think currently at least, combination walls miss the mark in this area, or in my experience, are not utilised correctly. The method of leaving a void and having essentially just your lining with a big gap in the middle is the best way I can think of for time saving for both disciplines. Another unfortunate side-effect of that however is having to cut an opening in both elements...but again, not really a huge problem considering the flow on time saving effects.

[cr_gixxer]

I haven't had the opportunity to do a collaborative model with consultants yet...perhaps one day soon, and what you have said will help.thanks.

[d.stairmand]

This Eccentricity Issue is the reason i now only use Foundation Slabs.
There is always a situation where you just need the Footing Sweep to do 1 thing & it doesn't.

[tntdraftsol]

looks like for walls @ 90 deg, you just have to pull the footing away a few feet past the perpendicular wall and then align it back.

I have some walls @ 45 deg. though, and can't seem to get it to work


THANK YOU Sir! your suggestion about carrying the foundation wall past the desired end point and then using the Align command worked!:beer: