@ronspaul wrote:
Have you developed a double slope (plantation style) truss or rafter system? I couldn't find any references to a roof of this type
↧
Truss Plugin/Extension
↧
Truss Plugin/Extension
@medeek wrote:
I would call that a polynesian roof:
![]()
![]()
![]()
Up until now I have not given it much consideration since no one has specifically requested it. I have spent some time study the geometry of this truss type and what type of logic would be required to generate the double slope.
Do you have any shop drawings that you could send me that would further me along in my study of this roof type? Do you prefer a truss or rafter solution?
↧
↧
Truss Plugin/Extension
@medeek wrote:
Polynesian 4/4 truss is working:
![]()
However, I haven't released this latest update yet, I still need to enable gable end trusses and advanced options for this truss type before it is ready for prime time.
The inputs are similar to all other truss types except you have two top chord pitches and a pitch break length measured from the left butt cut of the truss.
↧
Truss Plugin/Extension
@TheOnlyAaron wrote:
So... I am assuming that you have totally given up on sleeping, at this point? You are making huge advancements so quick! Great job!
↧
Truss Plugin/Extension
@medeek wrote:
Yeah, pulling back to back all nighters is never a good idea, I'm paying for it now... I had already been thinking about the polynesian truss type so I wanted to get some of my ideas into code before misplaced them. The only problem is once I start programming I quickly loose track of the time.
↧
↧
Truss Plugin/Extension
@medeek wrote:
Version 1.4.4 - 03.21.2016
- Added Polynesian truss type, configurations: (4/4).
- Metric input enabled for polynesian truss type.
- Added gable end trusses for polynesian truss type.I'm not sure where this type of truss is commonly used but whenever I see one I think of a bus stop or train station:
View model here:
Advanced options are not yet enabled for this truss type yet, so sheathing, fascia, rake will have to come later.
↧
Truss Plugin/Extension
@medeek wrote:
After adding Bowstring and Bow Barrel trusses the only common other round truss type is the Barrel Vault. The problem with this type of truss is the webs get messy or at least hard to predicate because of the interplay between the vault and the pitched roof above it. In an effort to better understand this type of roof/ceiling configuration I've created the matrix below:
High Res. PDF copy here:
http://design.medeek.com/resources/truss/BARREL_VAULT/BARRELVAULT_STUDY1.pdf
I am trying to predict the max. height of the vault given a specific roof pitch and and vault width to span ratio. Perhaps I am recreating the wheel and some architect or designer has devised a method to create the perfect barrel vault given a roof pitch and other criteria.
I would be interested in what other opinions are on this matter.
↧
Truss Plugin/Extension
@medeek wrote:
Using a typical Barrel Vault 8/7+4 or 8/7+2 configuration I come up with the following triangulations. I'm sure there are other methods of configuring these webs but for the purposes of the plugin I think these solutions will suffice for now:
High Resolution PDF copy here:
http://design.medeek.com/resources/truss/BARREL_VAULT/BARRELVAULT_STUDY1_REVA2.pdf
Based on this matrix I've been able to come up with a simple algorithm for the triangulation of this truss type. I'll admit the barrel vault truss is one handsome devil.
↧
Truss Plugin/Extension
↧
↧
Truss Plugin/Extension
@ronspaul wrote:
It's a common roof type here in Hawaii. They are used with gable ends as you've shown, but are also used in a hip configuration with the steeper top chord forming a dutch hip.
I'm interested in both the truss configuration as well as a conventional cut roof (rafters). Using rafters allows for a more dramatic vaulted ceiling effect. Trusses, however are more economical.
Thanks for incorporating this roof type. Looking forward to the advanced options, maybe with the hip option?, when you get the time.
Thanks, Ron
↧
Truss Plugin/Extension
@medeek wrote:
I would be interested in looking at any drawings or photos you have of the hip configuration of the polynesian truss. I will need something like this to assist me in adding this additional feature into the advanced options.
I would also be interested in adding a conventional rafter roof for this configuration however again I need some pictures of additional information so that I get it right.
↧
Truss Plugin/Extension
↧
Truss Plugin/Extension
@medeek wrote:
Version 1.4.5 - 03.24.2016
- Structural outlookers (vert. & horz.) enabled under advanced roof options for Scissor (4/4) truss type.I guess I somehow missed enabling structural outlookers for scissor trusses. Anyhow this issue was brought to my attention this evening so I've tried to rectify it as much as possible. After delving into the code I realized that the scissor truss module needs a major rewrite and cleanup so I was only able to get structural outlookers enabled for the 4/4 configuration. Later next week I will jump back into this module and work on the 2/2 and 6/6 configuration.
↧
↧
Truss Plugin/Extension
@gadget2020 wrote:
We commonly see a variation of the polynesian roof in old granite walled buildings (where the walls are ~600mm thick), but it's a normal roof rafter detail with the main load resting on the inside of the wall and a kicked lower section to extend beyond the wall's thickness and form an eaves overhang (Or sometimes just to come to the edge of the wall and have the gutter attached to the wall (no overhang)
↧
Truss Plugin/Extension
@medeek wrote:
I had someone ask me if it would be possible to create a small house or cabin based entirely on a raised heel attic truss profile, probably with some skylights for light. I've never seen this type of design before but I don't see why it might not work. Has anyone ever seen something like this done? Basically an attic truss with a raised heel (48') resting directly on a stem wall foundation with post and beams or something similar.
The one issue I could see is if there were no windows for a bedroom (no egress) that was midway the length of the structure. The design shown is 36' wide, 42' long with a 21' wide attic room. 6"x24" stemwall foundation, with a 12"x6" footing.
Typically large attic trusses are quite expensive so it would seem that this would be an expensive way to build a house perhaps there is some other reason that makes this method of construction viable?
View model here:
↧
Truss Plugin/Extension
↧
Truss Plugin/Extension
↧
↧
Truss Plugin/Extension
↧
Truss Plugin/Extension
@medeek wrote:
Do you have any shop drawings for the truss package for either of these two configurations or a photo of the framing?
The dutch hip variant will probably be very similar to a regular dutch hip (common trusses). The hip variant is going to be interesting.
↧
Truss Plugin/Extension
@medeek wrote:
Version 1.4.6 - 03.26.2016
- Added Cambered truss type, configurations: (6/X).
- Metric input enabled for cambered truss type.
- Added gable end trusses for cambered truss type.Six variants of the (6/X) configuration dependent on the ratio of the camber width to span. Notice that in all cases the top chord has six panels, the bottom chord varies from 4, 5 and 6 panels.
View model here:
↧