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Recent content by KootK

  1. KootK

    High Snow Load on Deck

    My thought would also be yes.
  2. KootK

    Misadventures in Rubber Stamping

    Agreed. I've been talking to software vendors about similar positions on and off for years. I was even offered a cool gig at Sideplate that, unfortunately, would have been too disruptive for my family. I'm hoping that, eventually, remote work options will make something like this available as...
  3. KootK

    interior truss heel sheathing

    Who cares if it's understood by framers? It's the engineers executing the structural designs that need to understand stability a the role of the diaphragms.
  4. KootK

    interior truss heel sheathing

    Feisty! This will be pedantic in a way that is sure to annoy you but I don't see any way around it. In my book, neither your bar stool example nor its predecessor constitute a meaningful example of structural stability. I consider meaningful structural stability problems to be those with the...
  5. KootK

    Misadventures in Rubber Stamping

    Firstly, thank your for that. Color me flattered. I do it for the money and for the opportunity to be useful. Seriously. I have worked in a great variety of structural engineering environments. Boutique shops, national firms, on my own... Unfortunately, not one of those work environments...
  6. KootK

    interior truss heel sheathing

    I consider that concern moot for the practical situations that we've been discussing. This is because the bulk of the load in those situations will be first delivered to the top side sheathing. As such, any component of those loads that is not perpendicular to the sheathing will be resisted by...
  7. KootK

    interior truss heel sheathing

    Thanks for this. I'm having the kind of day that can only be made more fun with a mental experiment. It depends on the type of "stability" being evaluated. For Euler-esque buckling between the ends of the dowels, the taller dowels are obviously more prone to buckling. And the "why" is just...
  8. KootK

    Misadventures in Rubber Stamping

    Obviously, it is a dangerous thing to admit to rubber stamping on this forum. Many members here feel that no version of rubber stamping is acceptable. They will want to chastise me and quote a whole bunch of state regulations justifying their stance. And I encourage that to some degree. That...
  9. KootK

    Diagonal sawn lumber as roof diaphragm

    And fine, design the boundary struts for some weak axis. That's no so hard. But you'll also need lateral connections that go someplace at the ends of those struts. That could result in some objectionable hardware in your average deck.
  10. KootK

    Diagonal sawn lumber as roof diaphragm

    The O86 seems to say that. The SDPWS2021 seem to say something else: that it's the chords that need attention over the cord spanning over the members distributing load to the diaphragm. So is it both?? O86 also seems to not be explicit in defining the load that the struts ought to be designed...
  11. KootK

    Diagonal sawn lumber as roof diaphragm

    What I find particularly interesting is that the diagonal sketch indicates curvature not of the chords, but of the struts. And that's somewhat intuitive if we are doing the weird truss thing. So, presumably, the struts need to be designed for out of plane load as well as the chords. And with...
  12. KootK

    Washington State---Broken Roof Trusses

    I'm also on team repair for all of the trusses. That said, it has to be done in a way that pays homage to the original design: 1) Moving the forces in an out of the joints between the webs and chords in a compatible way. 2) Acknowledging that the chord will have been designed with a flexural...
  13. KootK

    Diagonal sawn lumber as roof diaphragm

    Fascinating. I'll need to withdraw all of my contributions here as it's clear that I don't understand the system on a mechanistic level. I'm getting the sense that this setup is treated as some kind of non-concentric truss but I've not yet reconciled myself to it.
  14. KootK

    Diagonal sawn lumber as roof diaphragm

    Not sure I agree. In the context of diaphragms "out of plane" usually means perpendicular to the diaphragm, so vertical. That said, I've not checked O86 myself. If you're to design the boundary members for loads about their own weak axes, what loads then? If it's the lateral load on the...
  15. KootK

    Diagonal sawn lumber as roof diaphragm

    Nothing is jumping out at me. I'm not familiar with this. In this context, is "out of plane" vertical or horizontal? Can you post the relevant clause?

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