Theoretically, in my mind, the torsional stresses (and resulting rotations) will likely develop additional tension in the fasteners incrementally, and not just if/when the torsional strength is reached.
In reality, it's less clear what will happen. I would think that the "strong axis"...
Like many glazing systems details I have worked with in the past, I don't believe the correct answer is clear. But personally, if it a door for people, at a height of 80" or more, I would be skeptical of the ability of the thermally broken frame and connection to the top and bottom components to...
Do the various provincial P. Eng rules in Canada include anything similar to the more specific "responsible charge" requirements used by many US states, where the engineer stamping the project must be in charge of the development of the drawings, calculations, etc. ? I know each state is...
I likely wouldn't, as I would either use a cast-in anchor, or use a post-installed anchor (with a removable component if need be).
Some context might be helpful - and if you are trying to justify via ACI, the answers would likely depend on the load direction (i.e. Tension, Shear or Both)?
Personally, my initial thought is that ACI 318 doesn't really address this case, so I would say neither.
And I have a hard time envisioning a scenario where I think this would be a good idea anyway. Why not just use a cast-in insert instead of a cast hole?
Exterior? If so, I think the issue may be top and bottom support only - if designed at all, I generally see storefronts with vertical mullions included. Then glass is four side supported and not really an issue.
I think the information from Portland is on the "standard" nuts, not couplers, and I don't know that assuming that they have the same cross-section is a good idea.
In my mind, I would expect that you would need to do some analysis (thread pullout of the various components, overall tension on...
Dewalt / Elco Dril-Flex come in both a Phillips Undercut Flat-head
(https://anchors.dewalt.com/anchors/products/screw-fasteners/self-drilling-metal-screws/dril-flex/dril-flex_phillips_undercut_flat_head.php)
and Phillips Undercut Wafer head...
Interesting - will have to track down that report at some point - and glad to hear that someone has been digging in deep on the issue since I last investigated - aluminum design can already be challenging, and hopefully there will be some more tools available to handle these cases.
Having worked in the unitized curtain wall industry in the past, the structural behavior of aluminum extrusions (LTB and snap together male/female mullions) has been an issue for a long time.
Some specific comments -
1) From memory (and based on 2010 ADM), the flexural checks for...
Elco/Dewalt Bi-Flex are 300 series stainless steel, plus have a separate hardened tip, to provide better protection against hydrogen embrittlement / HSCC issue. And do come in an undercut head.
I think the OP was talking about the edge to the bottom in their sketch (approximately concrete thickness minus embedment).
Personally, I have always just followed the ACI defined minimum concrete thickness requirements of the product in question and have never tried to justify a condition...
