Foundation Plugin

MtnArch

What I've done in the past (and seems to work the best) is simply frame it as a door opening (36" or 48") with a 4x4 (or 4x6) with the top flush with the double top plate.

medeek

Something like this?

facer

Medeek,
I am curious about the "white" membrane, is there to be a concrete slab poured?
If so what was the construction sequence?
If it is a moisture barrier how is it protected?

MtnArch

Nathaniel -

Yep, that's basically it (though I've also see the top plates lapped into the header as well).

medeek

Version 1.0.3 - 08.28.2016

Enabled interior bearing wall(s) with strip footing.

View model here:

https://3dwarehouse.sketchup.com/model.html?id=89ee7df4-f895-437f-be51-553aa55bee08

I still need to enable the ability to add framed openings into the interior stud walls. Interior stud/bearing walls can be created with single or double top plates and can be full span or partial spanning as shown in the image above.

Also note that the studs are aligned from the right side of the stemwall foundation edge so that they line up directly under the floor joists.

medeek

My new job has kept me away for the last few weeks so that getting anything done on the plugins has been a real challenge. Even so I've been giving some thought to stepped footings/foundations and would like some input from the designers and architects out there on what is common practice and what they would like to see available for this sort of feature within the plugin.

View mode here:

https://3dwarehouse.sketchup.com/model.html?id=f83f65ea-35e6-46f7-9d6c-f0b09b13a663

Note that I messed up on this model the exterior cripple/pony walls should have only had one top plate so that the combined top plate from the shallow sections and the single top plate would have created the typical double top plate.

medeek

One question I've had is how much should the stemwall overshoot the step in the footing before stepping down itself? I've seen different ratios used (ie. rise/run) but I'm trying to find a consensus on what is common practice.

medeek

A typical step in the footing might look something like this:

medeek

I've repackaged the .rbz file this evening so that when it installs into SU 2017 the extension will have the appropriate hash file and appear as "signed". The foundation plugin may have the same issue with hashed file as the truss plugin, however it does not in any way affect the functionality of the plugin.

medeek

Version 1.0.4 - 11.27.2016

Enabled rebar and mesh reinforcement for slab on grade foundations.

Footing reinforcement is #3 - #8 bar.

Slab reinforcement is welded wire mesh or #3 - #5 bar.

European metric sizes are available in the metric mode.

View model here:

https://3dwarehouse.sketchup.com/model.html?id=8b35997b-f4d7-4d42-b88f-6e5d5dce8fcb

medeek

There are quite a few options to play with, rebar size and quantity. Notice in this example I've used #3 bar for the slab reinforcement rather than the mesh and I've doubled up bars on top and bottom of the footing (#5 bars):

On a related note does anyone have a good texture for rebar that they would be willing to share.

pbacot

You asked about the piers. A common design is 16"-24" square piers with top at grade. with a smaller block eg. 8x8 to raise the post above grade. the girders are often 4x6 so the spacing is about 6'-7' o.c. Larger spans mean larger beams & pads. And of course soils, as you mention may mean larger pads. I notice on your grade beam design the posts are sitting on top of the grade beam with no blocks or pedestals. The way you've drawn it, this would also be the subgrade height and posts are generally raised above the subgrade, even if they are pressure treated.

I wonder how many contractors actually do monolithic garage slabs as opposed to T-footings and "floating" slabs? They're both used in California.

pbacot

@medeek said:

One question I've had is how much should the stemwall overshoot the step in the footing before stepping down itself? I've seen different ratios used (ie. rise/run) but I'm trying to find a consensus on what is common practice.

Good question but I'd pose it the other way around. The top of the stemwall is based on grade and building design, then the footing step would be placed accordingly.

medeek

With regards to Posts and their footings I usually see this sort of configuraton:

Post, pedestal and square footing

I will make the post, pedestal, reinforcement and post base bracket optional. The actual footing will not be optional.

I would like to use pre-drawn post base components (ie. Simpson Strong-Tie) but I have to figure out how to import those into the model with the API

pbacot

That looks good, but for a round pedestal they usually leave the Sonotube on.

Garry K

You should be consistent with your post.skp files
Probably have the center at the bottom of the post sitting on the ORIGIN


def get_post_def(post_name)
  model = Sketchup.active_model()
  definitions = model.definitions

  definitions.each{ |my_def| return my_def if (my_def.name == post_name && my_def.valid?)}

  filename = File.join(path_to_your_plugin, "posts", "#{post_name}.skp")

  definitions.load(filename)
end

Then you need to place the post


# get the post definition
post_def = get_post_def(post_name)

# where pt is where you want to place it
tr = Geom;;Transformation.new(pt)

instance = group.entities.add_instance(post_def, tr)

medeek

Version 1.0.5 - 12.01.2016

Enabled reinforcement for stemwall foundations.

View model here:

https://3dwarehouse.sketchup.com/model.html?id=ef2187c3-eec9-487f-ae38-601f128390f1

medeek

I've been thinking about adding in a retaining wall feature that auto sizes the rebar and qty. based on my typical retaining wall details:

For stemwall foundations I typically check the footing width (bearing pressure) and min. rebar for shrink (ACI 318-11), see engineering calcs per this PDF:

http://design.medeek.com/resources/footing/STEMWALL_FOOTING_CALCULATOR.pdf

I could easily incorporate this type of engineering calculations into the plugin, however I'm still trying to figure out how to have the plugin output PDF reports, or Excel spreadsheets, which would be necessary if engineering reports become part of this plugin.

Same sort of thing with square or rectangular footings can be done:

http://design.medeek.com/resources/footing/SQUAREFOOTING_CALCULATOR.pdf

With stemwalls or pony walls (not necessarily retaining walls) that exceed 24" in height (but not in excess of 48") I like to add #4 bars cont. horizontal at 18" o/c. Logic could be incorporated that adds in additional stemwall and foundation wall rebar per a number of prescriptive criteria, IRC tables etc...

Currently it is entirely up to the users to specify rebar size and qty. with both stemwall and slab on grade foundations.

Stemwall foundations allow you to place rebar at the top of the wall (5" below top, qty. 1,2, or 3 bars) and rebar at the bottom of the wall (3" above bottom, qty, 1,2, or 3 bars). It also allows placement of bar in perimeter footing and interior footings (qty 1,2 or 3 bars). Bar sizes range from #3 to #8 and similar sized metric equivalents for the metric templates, I can always add more sizes if requested.

pbacot

Nice. I hope the number of sides on the rebar and bends is not so large as to slow down SU! Might be helpful to have on a separate component and layer.

medeek

Some good points pbacot:

1.) I currently have the number of sides on the bends set at default value but I can easily change this to a lesser value if its determined that the file size or speed of SketchUp is becoming impacted.

2.) Layers is something I have been meaning to add into both plugins, or at least the option for layers. It would be nice to have a separate rebar layer.

3.) Currently the rebar is not grouped in any special grouping or component except for the rebar inside of interior stemwall strip footings. For those footings I have setup a component that encompassses the footing, rebar and any post/beam or studwall framing. The reason for this is the ability to copy and paste additional interior footings based on the original one. I could group all of the other rebar and mesh into its own group or component if this seems like a good idea.