Barrel Vault Trusses
Barrel Vault Trusses
(OP)
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, truss designer or truss engineer 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.

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, truss designer or truss engineer 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.
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com





RE: Barrel Vault Trusses
High Resolution PDF copy here:
http://design.medeek.com/resources/truss/BARREL_VA...
The goal with triangulation, in my opinion, is to make sure the panel length is more or less equalized for both top and bottom chords.
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.
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com
RE: Barrel Vault Trusses
PDF:
http://design.medeek.com/resources/truss/BARREL_VA...
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com
RE: Barrel Vault Trusses
RE: Barrel Vault Trusses
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com
RE: Barrel Vault Trusses
RE: Barrel Vault Trusses
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com
RE: Barrel Vault Trusses
Maybe some of the guys designing the trusses aren't good with geometry & trig.
RE: Barrel Vault Trusses
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com
RE: Barrel Vault Trusses
Mike Halloran
Pembroke Pines, FL, USA
RE: Barrel Vault Trusses
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com
RE: Barrel Vault Trusses
Dave
Thaidavid
RE: Barrel Vault Trusses
I'd be inclined to use something wider than 2x4s as the bottom chords, maybe join them as an assembly and bandsaw the radius around an actual pin.
Then, instead of trying to laminate gypsum into a cylinder, I'd have some 1x stock milled with cove and bead edges, and plank the inside of the vault with them and a little glue.
Amd if I were going to that much trouble to make a nice smooth strong vault, I'd just varnish the wood instead of hiding it behind sheetrock.
... but that's me, and I don't have money for building custom homes anyway.
Mike Halloran
Pembroke Pines, FL, USA
RE: Barrel Vault Trusses
______________
MAP