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Double Inverted Trusses

Double Inverted Trusses

(OP)
For large agricultural buildings a double inverted truss can be employed to provide a large vaulted span for machinery:



I am wondering if this truss type is still commonly used by anyone for this type of application or is this type of truss mostly a thing of the past?

A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com

RE: Double Inverted Trusses

(OP)
A quick study of a double inverted truss by taking two 24' howe trusses and joining them to form a double truss. Note that the 4:12 pitch of the original trusses is maintained and the interior vault is exactly 8:12 pitch, not that this is a requirement.



View model here:

https://3dwarehouse.sketchup.com/model.html?id=d1f...

My question with this configuration is how the top and bottom chords at the peak should butt up? For example should the bottom chords at the peak have a double scarf cut or a single scarf cut? Some shop drawings would certainly help in determining what is common practice.

A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com

RE: Double Inverted Trusses

I've been doing trusses and construction since the 1980s, and I've never even had anyone ask anything like that. People don't want buildings with posts in them.

But my experience is limited to Illinois and Missouri.

RE: Double Inverted Trusses

(OP)
I've never seen a roof like this before either but practically every document that delineates various truss types will show this particular configuration.

A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com

RE: Double Inverted Trusses

Elimination of the middle bearing points is usually a goal. If this shape is desired it turns into a combination of the tray ceiling truss and the parallel chord or scissor. So use the double inverted shape, bring down the interior ridge point and now you have a clear span truss again.

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