How do pintle glulam connections work?

[RARWOOD]

At one time concealed hangers with a pintle were used for glulam connections. The first & second edition of the AITC manual show examples in their typical construction detail section (AITC 104-65).

As far as I know, this tye of connection is no longer used. I suspect the reason is that a notch shear failure occurs at the top of the pintle.

I was just wondering if any one knows more about this type of hanger, or is aware of any research articles that cover this type of hanger.

 

[msquared48]

In my 1965 edition pf the AITC, there is a note on the same sketch that says "Not recommended for use with unseasoned purlins." Obvious splitting problem due to bearing at an intermediate height of the total beam depth. Kerf plates with bottom bearing plate much better.

Plus, to me, if this is a drag link of any kind, there is a built-in eccentricity to any tension load that I do not like structurally.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[msquared48]

The hanger works by bearing the vertical load from the beam onto the pintle which is transferred in tension to the bearing plate at the top of the main beam.

The top strap takes out the eccentricity caused by the centerline difference between the pintle load and the bearing plate load. The strap keeps the amaller beam from pulling away from the larger beam due to this eccentricity, and may also serve as a drag strut connection.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask