Glulam uplift connection

[struct_eeyore]

I'm designing a perimeter glulam beam under a shearwall for a pile supported house. The glulam sits inside a notch in a pile, with the bearing taking all the gravity load, and a thru bolt taking the uplift. Now, I'm in Florida, so the uplifts are substantial - and I cannot locate the bolts below the NA per NDS. However, looking at the Glulam Connection Details (best practices) guide from the APA, it looks like that bolts thru the top of the beam can end up taking on gravity load as the beam shrinks, which again causes problems. With our high humidity here in FL, is shrinkage for glulams even a big concern - this will be inside a mechanical space below the floor, so I do not expect attic level temperatures.

 

[BAretired]

Simpson Strong Tie can supply beam hangers with uplift resistance. Have you checked their capacity?
If there is no hanger available with adequate uplift resistance, you may have to use a separate hold down device in addition to the hanger. Bolts through the supported beam seem like a bad idea.

 

[struct_eeyore]

BA, I've looked, but there's only one anchor that Simpson makes that works - but it's too wide to attach to the face of the pile. Sounds like I need to make custom straps.

 

[SlideRuleEra]

Oversize holes in glulam beams can be considered to allow for shrinkage. See:

American Institute of Timber Construction (AITC) Technical Note 8, "Bolts In Structural Glued Laminated Timber"