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  1. jjl317

    Steel-to-Steel Fastening with total thickness greater than 1/2"

    I agree completely - and especially seems prevalent with "TEK" type screws
  2. jjl317

    Steel-to-Steel Fastening with total thickness greater than 1/2"

    I have on occasion used the Tapflex from Dewalt (originally an Elco product) - basically a larger diameter bolt/screw, (3/8" to 5/8" diameter) where the installer pre-drills a smaller clear hole, and the fastener creates the threads in the base material (up to 5/8" thickness). Similar to drill...
  3. jjl317

    Windloads for a building in a building

    I am pretty sure its actually in the IBC (in 2012) 1607.14 "Interior Walls and Partitions"
  4. jjl317

    Aluminum Design - Unbraced unequal leg angles in bending

    Unless I am missing something, Single angles are addressed in a different section (F.5) that other open unsymmetric shapes (F.4.2.5), and the approach looks even more complicated (though it may be that F.5 are just more specifically defined versions of F.4.2.5). At this point, I have roughed...
  5. jjl317

    Aluminum Design - Unbraced unequal leg angles in bending

    I am working through the US based Aluminum Design Manual ADM (using 2015 version, though not sure if this section has changed much over the various versions) to determine the allowable bending moments for unbraced unequal leg angles. The ADM does include a number of worked out examples...
  6. jjl317

    Stainless Steel Fasteners

    I just realized I gave you a metal to metal "Tek style" screw. But Dewalt does make the Agge-gator, which is similar to the Bi-flex, but for concrete / masonry. My apologies for the confusion.
  7. jjl317

    Stainless Steel Fasteners

    FWIW - The Biflex screws come in under-cut head (though the number of options is somewhat limited)
  8. jjl317

    Stainless Steel Fasteners

    I would recommend Elco (now owned by Dewalt) Bi-Flex 300 series stainless steel screws - Ductile body with hardened tip, better for hydrogen corrosion embrittlement/HSCC
  9. jjl317

    Wooden Sleeper Load Distribution

    Or you could add multiple layers of cribbing to force the load to spread out over the (4) joists - lowest level would span from 1 to 2 and 3 to 4. Middle level centered between 1 & 2, and 3 & 4, then top level span between the middle levels. Would require much stronger/stiffer blocking, but...
  10. jjl317

    Aluminum Zee Stand in Compression & Bending

    My first thought would be what alloy/temper are you planning on using? Some are relatively easy to form (i.e. 3003-H14) but not as strong while others are difficult and prone to cracking (i.e. 6061-T6) but stronger. You may want to talk to a fabricator familiar with forming aluminum. For...
  11. jjl317

    Corner 90 degree butt glazed glass thickness calculation

    From memory, I thought the industry standard for center of glass deflection was L/60 (L being glass span), and maybe with a maximum (3/4", or 1"?), though I am not finding it published - maybe it was/is addressed in the specifications on a project by project basis. I do remember seeing the glass...
  12. jjl317

    Corner 90 degree butt glazed glass thickness calculation

    I am unfamiliar of the Canadian standard, but I do know in the US the allowable deflection can be much higher than people often think - but these limits are often defined for the center of a 4 sided lite. And guardrails are a completely different condition. I would be hesitant to blindly follow...
  13. jjl317

    Corner 90 degree butt glazed glass thickness calculation

    I guess in my mind, the first question is what do expect to happen at the butt-glazed corner? Will each half of this joint move under wind load (opening and closing the corner joint between the lites), or will you try and somehow connect the corner together? For insulated glass units, if I...
  14. jjl317

    Needle Beam and New Opening in Ex. Block Wall

    Personally, I would be inclined just shore the bar joists.
  15. jjl317

    Jamb Screw Design—Shear‑Only or Prying‑Tension?

    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"...
  16. jjl317

    Jamb Screw Design—Shear‑Only or Prying‑Tension?

    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...
  17. jjl317

    Equivalent "Responsible Charge" requirements in Canada?

    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...
  18. jjl317

    Post-installed or cast-in anchor?

    is this what you mean?
  19. jjl317

    Post-installed or cast-in anchor?

    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)?
  20. jjl317

    Post-installed or cast-in anchor?

    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?

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