Glulam Post Base Moment Connection
Glulam Post Base Moment Connection
(OP)
There have been several threads about this but I would like to get some additional information. I have a free-standing carport that was designed using flagpoled tube steel columns. Now the Architect wants to switch to glulam columns and beams. The service base moment is 4.5 ft-k. Seems like my options are a shoe, a knife plate or burying the treated column in concrete. I prefer to bury it just from an ease of construction standpoint but, of course, there are debates about rot. My problem with a shoe is getting the column to fit it tightly. Potential knife plate issues seem to be getting the contractor to drill a proper hole in the wood for the bolts. I am worried about looseness that might cause the carport to shake. Do glulam suppliers have bases that can be used for this with pre-drilled columns?
What has been y'all's experience with this issue?
Thanks!
What has been y'all's experience with this issue?
Thanks!






RE: Glulam Post Base Moment Connection
RE: Glulam Post Base Moment Connection
As for burying in the concrete - it may not rot, but if a car damages a post to the point it needs to be replaced, its going to be difficult if it is embedded in concrete.
http://files.engineering.com/getfile.aspx?folder=b...
RE: Glulam Post Base Moment Connection
Dik
RE: Glulam Post Base Moment Connection
RE: Glulam Post Base Moment Connection
RE: Glulam Post Base Moment Connection
They are extremely good fasteners and I'm surprised more people haven't been using them... been using them for 20 years or more... They are easy to design for... often use a little executable program I wrote in Delphi about 20 years back to handle shear and moment... No viruses, or malware... but is executable. Usual cautions about using software intelligently. Program is 'self-explanatory' and unitless...
Dik
RE: Glulam Post Base Moment Connection
RE: Glulam Post Base Moment Connection
RE: Glulam Post Base Moment Connection
It runs on mine. I have Windows 7 64 bit.
RE: Glulam Post Base Moment Connection
Dik
RE: Glulam Post Base Moment Connection
RE: Glulam Post Base Moment Connection
RE: Glulam Post Base Moment Connection
RE: Glulam Post Base Moment Connection
Dik
RE: Glulam Post Base Moment Connection
Having struggled with this on many occasions, I'd basically given up hope that such a connection was possible (bi-directional moment with potential shrinkage issues). While it's a very week form of proof, I'd kind of taken the fact that Simpson offers no such connector as evidence of it not really being possible/practical. Everybody wants there to be such a thing. So badly, in fact, that Simpson has seen fit to put that "don't use this for moment dummy" warning on all of their post base products. There's got to be something keeping them from developing a response to what is clearly a significant market demand.
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: Glulam Post Base Moment Connection
see here
RE: Glulam Post Base Moment Connection
The moment capacity of that is pretty minimal - 1960 ft-lbs in cracked concrete - prolly only suitable for fences and maybe decks. Would have to run the stiffness calc to see how flimsy they are.
Update:
The owner has decided they want chunky 10"x10" I-beams and columns - so W10x49 or HP10x42 moment frame it is. Made this pretty easy.
RE: Glulam Post Base Moment Connection
Nice of the owner to make your job easy.
RE: Glulam Post Base Moment Connection
The Perma-column company has a metal bracket attached to a precast base that apparently creates a fixed connection for pole barn type framing. I haven't dug through all of their test reports to see how true that is, though.
RE: Glulam Post Base Moment Connection
Nice, thanks so much. Apparently, I now exist in some kind of bubble where industry developments aren't reaching me...
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.
Massively better than nothing in my opinion. If they can do it, I can too.
RE: Glulam Post Base Moment Connection