3D Truss Models
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I'm trying to figure out the correct way to frame the stairwell as it joins up with the floor diaphragm above.
It's hard to show exactly what I mean with sectional views, the best thing is to view the 3D model and you will see what I am talking about.
3D Warehouse
3D Warehouse is a website of searchable, pre-made 3D models that works seamlessly with SketchUp.
(3dwarehouse.sketchup.com)
I am working on the polygon and hole tool for I-Joist and Solid Sawn floors. When you actually frame out this opening would you just use rimboard around the perimeter as I have shown?
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A note on the Bobtail truss. For me the height of the heel seems the first obvious important dimension, because the bobtail is used both sides to maintain an exterior wall height while lowering the standard ceiling height. At least this is how we used it recently. The other method seems tied to where the ridge is and the asymmetrical use is not normal or traditional.
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On the stairs you can do that as a vanilla framing solution. More important will eventually be how the stairs are supported. Often there's a beam at floor level that the stringers are hung on. In other cases the stringers are just bearing on a wall or beam below. The stringer structure is deeper than you show it. That is, stair support at the top varies, but this seems good for a start. What else were you considering? You might allow for double joists where it makes sense-- some standard framing method for any hole in the floor.
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Nice model! The textures and detail make it a clear representation.
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I've got to fix my wife's computer today so that will probably stop me from getting any real meaningful work done on the plugins but at least I've been able to throw together a first draft for the office I want to build. Any thoughts on improving the design, sometimes once you get an idea in your head it is hard to see outside the box.
I haven't shown the doors or the front porch which will probably be quite small and pressure treated lumber.
- 32'x24'
- 5:12 or 6:12 roof with asphalt shingles
- two rooms
- 9' ceilings
- stemwall foundation with crawlspace
- carpet throughout
- 5/8" wallboard
- 3068 doors, (1) 4040XO, (3) 5040XO
- 11-7/8" I-Joists at 16" o/c
- studs DF No. 2, 2x6 @ 16" o/c
- sheathing will probably be 1/2" plywood, I don't like OSB in our climate.
- Siding Hardiplank or cedar siding, my budget may call for T11 though.
- Electric wall cadet heaters
- 50 AMP sub-panel from house
- 16" overhangs at eaves and gables with gutters and downspouts and 4" drain lines away from building.
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Finally getting around to adding the flat trusses:
I've decided to also provide the option for a monoslope and pitched design. Advanced options won't be for a while yet. I'm still not entirely sure how to handle the gable end trusses for this truss type, what is typical?
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All the end details are working. This is an example of a Mansard Parapet truss with 5 panels and different overhangs:
Now I just need to work on the plates and advanced options.
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I'm still working on the pitched and monoslope option. I will probably release this update without having the advanced options and plates enabled since those items are nice but not a necessity and can be added at a later date.
The next two big items that I would like to tackle is the hip trusses and the timber trusses both of these would be a welcome addition to the plugin.
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Version 1.9.0 - 05.27.2017
- Added flat truss type, configurations: flat, monopitch, pitched.
- Metric input enabled for flat truss types.
- Added gable end trusses for flat truss types.
- Enabled the following end details for all flat truss types: None, Overhang, Cantilever, Mansard, Parapet, Mansard w/ Parapet.
Plates and advanced options are still in progress. With the amount of configurations available with this truss type it will probably be a while before these next elements are in place.
The flat truss type is very configurable and with a little adjustment of parameters you can also easily create a (non-attic) gambrel truss using the flat pitched option.
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Here is an example of a small commercial building with a flat truss roof (parapet):
Download model here:
3D Warehouse
3D Warehouse is a website of searchable, pre-made 3D models that works seamlessly with SketchUp.
(3dwarehouse.sketchup.com)
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The flat truss is the first new truss type added to the plugin in 11 months. This brings the total number of truss types to approximately twenty two depending on how you classify the variants of the flat truss:
View model here:
3D Warehouse
3D Warehouse is a website of searchable, pre-made 3D models that works seamlessly with SketchUp.
(3dwarehouse.sketchup.com)
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The flat double pitched truss allows for a user driven asymmetric ridge location as well as differing left and right heel heights. This opens up virtually any possible truss geometry even a negative pitch if one is so inclined:
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I thought I was done with flat trusses but it was pointed out to me that I also need to consider top chord bearing configurations for this truss type.
I've created a simple matrix below with top and bottom chord bearing flat trusses. I'm not sure if these make sense, please review and feel free to comment.
The model can be downloaded here:
3D Warehouse
3D Warehouse is a website of searchable, pre-made 3D models that works seamlessly with SketchUp.
(3dwarehouse.sketchup.com)
Top chord bearing usually involves the following steps:
1.) Trimming the heel web up a specific vertical amount (vertical offset).
2.) Insertion of a secondary heel web next to the trimmed (bearing) heel web.
3.) Trimming the bottom chord back to the secondary heel web.
4.) The diagonal web next to the heel is slightly altered by the addition of a secondary heel web.
5.) Certain configs require an additional heel web on the outside of the trimmed heel web: Mansard, Cantilever, Mansard w/ Parapet.I can easily make this all happen and open up the option for top chord bearing flat roof trusses however I want to make sure it is right first.
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The top chord bearing option is almost complete for the flat trusses. Here is a preview with a Mansard /w Parapet on the left side and a cantilever on the right side. The bearing widths can be set independently as can the parapets heights now.
I'm not entirely satisfied with the UI for this truss type, a proper html UI would be much more intuitive but time consuming to create. Yet another important item on the todo list.
The plugin is starting to stray into some fairly exotic truss territory.
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Wood Gusset plates are on my mind this morning (for those of us crazy enough to build or own trusses):
Of course this option would be pretty much useless without the engineering to size the plates and check the fasteners. I will be giving this some more thought in the near future.
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I think a lot more people fab their own trusses than we realize. I don't disapprove but I do think that quality control is imperative. One bad joint in a truss can cause the entire truss to fail which in turn may cause a catastrophic failure of the roof system.
Some jurisdiction will require an engineer's stamp on any site built trusses, as they should, but there are many situations (ie. agri structures, small buildings) where there is no oversite by a building official or engineer. For those situations it would be useful to have an easy to use truss calculator that even the lay person could utilize and understand.
From my side there is some risk and liability associated with this, especially since I have no way to confirm the workmanship of the construction. If someone were to utilize my calculator and design a truss with plywood gussets, and assuming that they built it per the calculations and input the correct snow loads etc... but the construction was shoddy and it failed would I still be liable? Probably so. That is why I have hesitated on releasing the wood gusset portion of my Truss Designer (web based).
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I think I've beaten the flat truss to death but I noticed after perusing through a number of flat truss shop drawings that the modified warren is also a popular web configuration. Its not too big of a deal to enable this configuration. The flat truss will then have the option between a pratt or mod warren web configuration.
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Medeek,
The following is not a criticism but a reflection of the difficulty of managing priorities.I think the following article may apply at this stage to your development of the Truss Plugin:
Following article is from:
https://www.briantracy.com/blog/personal-success/how-to-use-the-80-20-rule-pareto-principle/And yes it applies to all of us!
*The 80 20 Rule Explained
Personal Success 80/20 Rule
The 80 20 rule is one of the most helpful concepts for life and time management.Also known as the Pareto Principle, this rule suggests that 20 percent of your activities will account for 80 percent of your results.
This being the case, you should change the way you set goals forever.
What Is The 80 20 Rule?
As I just mentioned, the 80 20 rule is also called the “Pareto Principle.” It was named after it’s founder, the Italian economist Vilfredo Pareto, back in 1895. He noticed that people in society seemed to divide naturally into what he called the “vital few,” or the top 20 percent in terms of money and influence, and the “trivial many,” or the bottom 80 percent.
Later, he discovered that virtually all economic activity was subject to this principle, in that 80 percent of the wealth of Italy during that time was controlled by 20 percent of the population.
We can take Pareto’s 80 20 rule and apply it to almost any situation.
In particular, we can apply it to goal setting and productivity.
Download my 14-Step Goal-Setting Guide to put the 80 20 Rule into action!
How Does It Work?
If you have a list of ten items to accomplish, two of those items will turn out to be worth more than the other eight items put together.
The sad fact is that most people procrastinate on the top 10 or 20 percent of items that are the most valuable and important, the “vital few,” and busy themselves instead with the least important 80 percent, the “trivial many,” that contribute very little to their success.
How To Apply The 80 20 Rule To Goal Setting
Here’s what you should do in order to effectively apply the 80/20 rule to goal setting and to your overall productivity.
First, take a piece of paper and write down ten goals. Then ask yourself: If you could only accomplish one of the goals on that list today, which one goal would have the greatest positive impact on your life?
Then pick the second most important goal. What you’ll find is, after you complete this exercise, you will have determined the most important 20 percent of your goals that will help you more than anything else.
You should continue to work at those goals that you’ve chosen as the most valuable all the time.
Eat The Biggest Frog First
You often see people who appear to be busy all day long but seem to accomplish very little. This is almost always because they are busy working on tasks that are of low value while they are procrastinating on the one or two activities that could make a real difference to their companies and to their careers.
The most valuable tasks you can do each day are often the hardest and most complex, but the payoff and rewards for completing them can be tremendous.
Before you begin work, always ask yourself, “Is this task in the top 20 percent of my activities or in the bottom 80 percent?”
The rule for this is: resist the temptation to clear up small things first.
If you choose to start your day working on low-value tasks, you will soon develop the habit of always starting and working on low-value tasks.
Always Work Towards Your Main Goal
Finally, I want to tell you about a study that has just been done about the attitudes of rich people versus poor people in regard to goal setting. What they found is that 85% of rich people have one big goal that they work on all the time.
So, if you want to be wealthy, do what wealthy people do. Pick one big goal and work on it all the time, and if you do, it will change your life*
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Enabled mod warren webs for the double pitched flat truss configuration:
The truss shown above is an asymmetric double pitched top chord bearing flat truss with a mod warren web configuration and cantilever ends. That is quite a mouthful.
I have not added the top chord bearing option and the mod warren webs to the other flat truss configurations yet (flat, monopitch, pitched), however I will if specifically requested.
As Facer has duly noted priorities are critical and there a much hotter items on the plate.
The stepdown hip truss set is the big one, that is next, and yes it will be a game changer.
The flat truss was just a primer to warm up my programming chops, its been almost a month since I was able to touch the truss plugin.
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Since about version 1.6.0 I've been tracking every installation of the plugin. The funny thing is that I see more installations of previous versions of the plugin than I do of the current version. I am wondering why that is and also where the previous version is being distributed from. It's not a huge deal but it does have me wondering.
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