3D Truss Models

medeek

More "Fun with Roofs".

This roof was generated by first creating a hip roof primitive then deleting all but 3 components which were then copied and rotated into place for the lower roof hip corner. The shed roof /w ledger component was created with one primitive and then copied and rotated into place. Overall a fairly painless process now that I am somewhat familiar with navigating my way around SketchUp. The fascia required a couple of trims.

The pyramid at the top required no manual intervention. Approximately 10-15 minutes of work for a fairly substantial roof.

View model here:

https://3dwarehouse.sketchup.com/model.html?id=ue55bf7ab-c669-4cd7-8f05-305dee4e2519

medeek

Testing the real world application of the Medeek Truss Plugin. This model combines a double fink truss, raised heel fink truss, monopitch truss and shed roof with ledger. While creating the shed roof special attention to the birdsmouth cut was required to ensure that the fascia height of the rafters and trusses lined up. Also note the use of the raised heel type truss on the upper roof portion. Structural outlookers were specified for all gable overhangs.

5:12 pitch roofs with rafters and trusses 24" o/c. I did not apply a level cut to the rafter overhangs but that would probably be a given. Span of the double fink is 48 feet with 2x6 top and bottom chords.

View models here:

https://3dwarehouse.sketchup.com/model.html?id=u98040448-af54-4d79-af30-a3aefca9b941

https://3dwarehouse.sketchup.com/model.html?id=ud8f4c186-1836-4d16-928a-2ba8c10c99a9

If anyone has some real world applications using the plugin that they are willing to share I would be very interested to see how it is being used and it would also give me some direction for further development and improvements.

pilou

What a plugin!

Sorry for the diversion!

medeek

I've ran into this structural question before, where you have a stairway next to an exterior wall. My first thought is to call out a balloon framed wall up to the 2nd story top plate(s) but then that makes the rim board and double top plate of the first story discontinuous. What is the preferred solution or how have you seen this done in similar circumstances.

Here is a quick mock up in SketchUp to better explain what the two options are:

You can also view and download the 3D SketchUp model here:

https://3dwarehouse.sketchup.com/model.html?id=uf979b67e-2755-4981-9bfc-06d20b64d313

juju

Hi Nathaniel,

I noticed that Extension Warehouse has two links for your plugin, the one should be removed, not so?

http://extensions.sketchup.com/en/content/medeek-truss-plugin

http://extensions.sketchup.com/en/content/medeek-truss-plugin-0

medeek

For some reason there are two copies on Extension Warehouse, you're right. I'm looking into it.

medeek

Example of a porch roof using the hip roof and shed roof primitives. I'm wondering if it might not be worthwhile to add in a feature to create this type of combination roof automatically. Shed Roof w/ ledger & hip ends.

View updated model here:

https://3dwarehouse.sketchup.com/model.html?id=uf979b67e-2755-4981-9bfc-06d20b64d313

pbacot

Both shed and hip add-on roofs would be useful, porches and partial 2-story structures.

medeek

medeek

Started the manual as a MS Word document however that doesn't work so well for hyperlinks. Starting over with an html manual page:

http://design.medeek.com/support/trusspluginmanual/mainpage.html

http://design.medeek.com/support/trusspluginmanual/commontruss.html

Couple of pages up, only about 25 more to go...

medeek

Version 1.2.9 - 02.12.2015

Added Shed Rafter Roof (all advanced options enabled).
Added ceiling joist option for Shed Rafter Roofs.
Initial menu now defaults to last picked option of session for that sub-menu item.

A typical application might be a clerestory roof with a upper shed roof and lower shed roof with a ledger board:

View model here:

https://3dwarehouse.sketchup.com/model.html?id=u0b2dd5bc-605d-467c-a6bb-449bb54e76e6

medeek

Version 1.3.0 - 02.14.2016

Added tail bearing truss type, configurations: (Fink).
Metric input enabled for tail bearing truss type.
Advanced options enabled for tail bearing truss type.

View model here:

https://3dwarehouse.sketchup.com/model.html?id=u704b9d92-bd38-4895-b71b-19691f31cca7

I have shown 3 configurations of the same roof to display the differences with non-structural vs. structural outlookers (horz. & vert.). I am not exactly sure how to treat the gable end truss for this truss type since I have never dealt with this type of truss before. Specifically, where structural outlookers are employed. Any sample outputs showing the gable end truss with a dropped top chord for a tail bearing truss would be very helpful.

Theoretically, one could forego the gable end trusses altogether and just balloon frame up to the roof diaphragm but I would like to provide the option for gable end trusses if it is a typical method used in real construction of this type of roof.

medeek

I am currently investigating the best method to construct the gable end wall and truss with a tail bearing truss. Show below are 3 different possible configurations:

1.) Structural Outlookers (Vertical)

2.) Non-Structural Outlookers (Horizontal)

3.) Structural Outlookers (Horizontal)

This is just one possible method of framing the gable end wall into the gable truss with a 2x4 outlooker. Option 3 shown above is somewhat of a question, not sure how that heel joint would come together.

View the model here to analyze the different configurations:

https://3dwarehouse.sketchup.com/model.html?id=u75c42456-c8e5-4002-bc93-779860f8dc61

medeek

Alternatively one could balloon frame the wall at the gable ends and attach a ledger for the ceiling:

View model here:

https://3dwarehouse.sketchup.com/model.html?id=ub1aa30d4-a7c3-4320-8bc4-03fd128b5913

In my opinion a partially sloping wall gets complicated to frame. From an engineering standpoint the balloon framed wall is also the strongest option.

This method of framing the gable end wall may make the most sense. I'm trying to form a consensus though on the best way to frame this so that users of the plugin are presented with adequate options that cover 90% or better of design situations they will come across in practice.

For those of you who are particularly interested in the the tail bearing truss please weigh in and let me know which option(s) works best for you.

medeek

Version 1.3.1 - 02.15.2016

Added Triple Fink and Quad Fink common truss types.
Structural outlookers (vert. & horz.) enabled under advanced roof options for Common (Triple & Quad Fink) truss types.

Triple Fink @ 70' w/ 2x6 chords
Quad Fink @ 80' w/ 2x6 chords

View model here:

https://3dwarehouse.sketchup.com/model.html?id=u2b57ed6d-9f1f-47c4-9e09-5489940c94b2

JQL

Medeek, I've been following this thread from time to time. It's an impressive plugin you've been pulling together here! Congratulations!

medeek

@jql said:

Medeek, I've been following this thread from time to time. It's an impressive plugin you've been pulling together here! Congratulations!

Thank-you for your interest and the vote of confidence. I'm still plugging away at it every free moment I get, it is incredibly addictive and still amazes me what one can do with a little code and a well written API.

With the tail bearing trusses I'm still waiting on more responses from architects, engineers and contractors so I can finalize the gable end truss for that specific truss type.

It looks like I was featured in SketchUcation's latest newsletter, thank-you for that. I will say I need more feedback though, a lot of what drives this is the requests from users or potential users of the plugin.

I haven't had the time to get back into the complex hip roof framing stuff but I would like to seriously attack that again as soon as possible.

medeek

I've been looking at a number of garage designs recently that employ an attic or storage truss. I'm finding that a lot of them tend to use raised heels to allow for more head room while having a lower roof pitch (ie. 6/12 - 8/12). I'm thinking about adding in raised heels for the attic truss type in the plugin.

A quick mock up would look something like this:

View model here:

https://3dwarehouse.sketchup.com/model.html?id=u208d64e3-ddcf-4923-8dfb-d507185fa663

Ignore the unbalance in the panel lengths, in practice and in the plugin they will be properly balanced.

What I do have a question on is the use of a top chord splice as shown in the above image so that the overhangs do not have to be as deep as the top chord in the non-triangulated region of the truss. I have never seen a splice used on a attic truss with a raised heel, I don't see why it can't be done but it is always nice to have a confirmation that someone else is doing this sort of thing in practice.

pilou

Do you think adapt your plugin for this sort of thing ?

juju

@pilou said:

Do you think adapt your plugin for this sort of thing ?

haha, pilou, always pushing the envelope, I'd dare to say I think that is far beyond the scope of the plugin and perhaps beyond the liablity framework Nathaniel is willing to work in...

but let's see what he says...