best purlin connection: over trusses or in the field?
best purlin connection: over trusses or in the field?
(OP)
Hi
why do people always want to connect / extend roof purlins over trusses?
Is it not more efficient to connect them rather in the middle of the span?
Your deflection would be less and your cut offs would be reduced
see attached sketch
Lolobau
why do people always want to connect / extend roof purlins over trusses?
Is it not more efficient to connect them rather in the middle of the span?
Your deflection would be less and your cut offs would be reduced
see attached sketch
Lolobau






RE: best purlin connection: over trusses or in the field?
RE: best purlin connection: over trusses or in the field?
If you save them trimming each purlin they're happy.
RE: best purlin connection: over trusses or in the field?
RE: best purlin connection: over trusses or in the field?
RE: best purlin connection: over trusses or in the field?
Are you proposing a moment connection at midspan?
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: best purlin connection: over trusses or in the field?
RE: best purlin connection: over trusses or in the field?
BA
RE: best purlin connection: over trusses or in the field?
RE: best purlin connection: over trusses or in the field?
by long buildings the standard length of the purlins hardly lines up with the trusses so they always need to be trimmed back
why moment connection in the midspan? what about the theory GERBER BEAM ?
RE: best purlin connection: over trusses or in the field?
You have a guy sitting on a beam bolting the purlins together. Where are you going to sit to bolt them together in between the beams?
RE: best purlin connection: over trusses or in the field?
I was just curious because the detail that you provided looked as though it could be a moment connection if desired and the deflected shape that you drew in your sketch suggested continuity across the mid-span splice. I like the Gerber system as much as the next engineer but that's not what you drew in your original sketch. Is Gerber something that you're actually proposing here? I can't imagine why one would want two mid-span splices in a purlin unless these purlins are a lot longer than I'm envisioning.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: best purlin connection: over trusses or in the field?
RE: best purlin connection: over trusses or in the field?
Deflection and force wise I still belive that the "Gerber" solution for purlins also efficent would be
@KootK: It is such an mix from Gerber system and present purlin length on site. Tomorrow i will upload some photos from wronk from the real structure. Then you guys will see what I am refering to. I hope there are some good photos from the site
Thnaks so far for the valuable tipps
Lolobau
RE: best purlin connection: over trusses or in the field?