topic Re: Help with footing in Modeling

Help with footing

Anonymous — Thu, 25 May 2023 16:01:49 GMT

I (not unlike other people, I think, based on my review of previous posts) am having trouble with creating a simple footing. I have tried using a wall element for the stem and another wall element for the pad. The problem with that is that the hidden line looks good in plan, but should not be hidden in section. The best I can come up with (besides the "footing" in the slab extras is a using the beam tool. Problem with that is the corners of the stem become clipped, and in section, there is a horizontal line between the stem that should not be theres. Any help would be greatly appreciated.

Regards

Re: Help with footing

Anonymous — Mon, 05 Sep 2005 17:30:47 GMT

The Answer to "clean" intersections in the Section window usually is the matter of what fill pattern is associated with the objects (Wall, slab, beam, etc..) If you want the objects to be seamless at the intersection, they must have the same Fill pattern in the Section. Make sure that the materials that are assigned to the "footIng" (regardless of the tool used) and the "stem wall" have the same fill pattern.

Re: Help with footing

Anonymous — Mon, 05 Sep 2005 18:39:41 GMT

Thanks for the response. Will that work if one object is a beam and the other a wall? Or between a wall and a slab?

Re: Help with footing

Anonymous — Mon, 05 Sep 2005 20:08:30 GMT

Short Answer.... Yes

Re: Help with footing

Anonymous — Tue, 06 Sep 2005 00:19:27 GMT

Short Response: Thank You!

Re: Help with footing

TDabney — Tue, 06 Sep 2005 01:59:35 GMT

I usually use the slab tool for footings - very quick w/the magic wand. You can set up a pretty complicated hoouse w/lots of jigs and jogs and pony walls etc... in just a few minutes.
Tom

Re: Help with footing

Anonymous — Tue, 06 Sep 2005 04:36:14 GMT

Tom, interesting concept. How do you easily control the width of the slab?

Re: Help with footing

Rakela Raul — Tue, 06 Sep 2005 13:18:31 GMT

if u are using a simple / 90 degrees / straight / continuous footing like the one shown below, i would use the slab accessories under 'extras'...
everything else is a pain cuz u need to re-do everytime u move a walls/slabs

Re: Help with footing

TDabney — Wed, 07 Sep 2005 13:04:35 GMT

Assuming the foundation walls are already placed, I magic wand a slab around the entire perimeter, then use the offset option at one of the nodes to offset the the slab from the outside the required distance. Then, magic wand the interior of the slab as needed to essentially cut holes in the slab. Finally use the offset option again to offset the slab from the inside of the walls.

Rereading what I just wrote - doesn't sound exactly clear. It'd be easier to show than to explain w/words! My method is admittedly sometimes not quite as easy as it should be. depending on the complexity of the footprint and varying heights of setmwalls etc... - I usually end up manually dragging a few slab nodes around and adjusting some offsets manually.

Tom

Re: Help with footing

TomWaltz — Wed, 07 Sep 2005 13:14:26 GMT

TDabney wrote:
Assuming the foundation walls are already placed, I magic wand a slab around the entire perimeter, then use the offset option at one of the nodes to offset the the slab from the outside the required distance. Then, magic wand the interior of the slab as needed to essentially cut holes in the slab. Finally use the offset option again to offset the slab from the inside of the walls.

Tom,

I think your method is the most flexible and reusable way to do footings. I have seen a lot of methods, and either slabs or walls works best. The Accessory is nice sometimes, but has its limitations as well (though the CADImage one is a lot nicer, it is still not quite as flexible as I would like).

My only problem with using slabs is that if you show them dashed on plan, they dash in your sections as well!

Re: Help with footing

Rakela Raul — Wed, 07 Sep 2005 13:30:55 GMT

incredible that ac has such a limitation in a so fundamental tool for design and construction...accessories needs 'offset' + 'angle'+ various type of foundations.
revit has a tool called 'edge footing', which is also an under developed tool
and not worst than ac's slab accessories.

Re: Help with footing

TomWaltz — Wed, 07 Sep 2005 13:42:31 GMT

Rakela wrote:
incredible that ac has such a limitation in a so fundamental tool for design and construction...accessories needs 'offset' + 'angle'+ various type of foundations.
revit has a tool called 'edge footing', which is also an under developed tool
and not worst than ac's slab accessories.

The accessories in general have always struck me much the same way the Archicad Object Library in general does: A neat tool with a lot of potential, that GS never really developed all the way.

The Accessories look so great, and work sometimes, but really need more attention before they will reach their full potential. That's why I mention CADimage so much, because they really took the Accessories a lot further than Graphisoft has.

We can only hope that someday our voyage will lead us to a better way to do foundations.

Re: Help with footing

Karl Ottenstein — Wed, 07 Sep 2005 16:42:19 GMT

The choice of modeling tools will vary based on the situation of course ... but I switched from slabs to walls early on after finding that our preliminary footing designs were almost always changed by the structural engineer.

With our steep sites involving often asymmetric footings under retaining/stem walls, the engineer typically calls out not only the footing width and depth, but also the offset from the face of the wall (the asymmetric part). Using the wall tool for the footings makes it easy to adjust all of the parameters in the preliminary model, including the (reference line) offset. When I used to use slabs, it was just a lot more editing to adjust both sides of each run of footing.

Just what has worked for us.

Karl

Re: Help with footing

gpowless — Wed, 07 Sep 2005 17:07:59 GMT

Using slabs has its advantages. You can break the footing anywhere you want, raise and lower the sections to create steps and then SEO with downwards extrusion on the wall.

Before SEO I used flat roof slabs and trimmed to slab at the base of the wall. This was more tedious........

Re: Help with footing

Karl Ottenstein — Wed, 07 Sep 2005 17:17:11 GMT

gpowless wrote:
Using slabs has its advantages. You can break the footing anywhere you want, raise and lower the sections to create steps and then SEO with downwards extrusion on the wall.

Can do all of this with walls as well, except that the breaks will be perpendicular to the reference line, while slabs can of course be cut in any shape. 😉

Karl

Re: Help with footing

Rakela Raul — Wed, 07 Sep 2005 17:25:36 GMT

wow, i think we are in need of a tool here !!! dont u agree gs ??

why not using the slab accessories tool to the closest possible to match the real footing and forget about it...and then use 2d lines to dress it up
for the cd's

Re: Help with footing

Link — Wed, 07 Sep 2005 17:44:05 GMT

The choice of modeling tools will vary based on the situation of course ... but I switched from slabs to walls early on...

I don't know how you can look past walls for footings, given the current tools available. You can magic wand them in with the offset, elevations and heights already applied. Using favorites, you can magic wand an entire (single level) footing system in with just a three clicks. If you need to change any heights, simply split and elevate them. Peica.

For a sloping footing, the roof tool is next best thing IMHO.

Cheers,
Link.

Re: Help with footing

Rakela Raul — Wed, 07 Sep 2005 20:21:23 GMT

That's why I mention CADimage so much, because they really took the Accessories a lot further than Graphisoft has.

looks good...and as an 'accessories', i guess moves with the slab....seems a decent alternative.
(edited)
i regret not taking a closer look at cadimage's solution for footings before..and 150 dls is not bad @ all.....case closed

Re: Help with footing

Aussie John — Wed, 07 Sep 2005 23:07:09 GMT

I couldnt imagine using slabs for footings. after you set up all of the footing beams at 300 wide then the engineer changes them to 400w. No way.

Re: Help with footing

Anonymous — Fri, 09 Sep 2005 05:33:12 GMT

I notice that no one has mentioned the possibility of using
a library part for making footings.
I have been experimenting with a library part that
makes footings and it seems to show some promise.
It is stretchable and the miters and joints are made quickly
with 2D editable hotspots.
Independent control of how it appears in plan, section/elevation,
and in the 3D window is easily done.
Offsets, asymmetric footings, independent line types, pen weights,
sloped sides, e.t.c. can all be coded for.
I submit that this option has some merit.
Thank you,
Peter Devlin