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Recent content by Tomfh

  1. Tomfh

    Artificial Intelligence in Structural Engineering

    Sure, it predicts the most likely answer, but to do that effectively, it has to build internal structure that reflects the underlying relationships in the problem. That’s the part the “it just predicts the next token” criticism always glosses over. It’s not random guessing, it’s generalisation...
  2. Tomfh

    Artificial Intelligence in Structural Engineering

    What exactly do you think “reasoning” is? What is it that humans are supposedly doing, that LLMs are not? What’s the actual distinction you’re drawing?
  3. Tomfh

    Artificial Intelligence in Structural Engineering

    Saying LLMs “do no reasoning” isn’t accurate. They don’t use simple logical operations, but they consistently handle tasks that clearly require what we’d call reasoning in any other context, e.g. logic problems, multi-step calculations, complex code, passing the medical exams. It’s not doing it...
  4. Tomfh

    Darn Architects!

    No way. There’s nothing to restrain them when they bow. If they want slender then use metal posts.
  5. Tomfh

    Another how to fix it thread

    I’d use hangers too, ones with nail holes full depth of the hanger, not just at the top. That way you stitch across the notch. Hammer in packers between the dark wood and the light wood., that way you can mobilise both.
  6. Tomfh

    Footing capacity after 35 years

    How much it can spread depends on the footing and wall's strength and stiffness. If it is stiff and strong enough to dilute the bearing pressures then you are fine. If the wall is continous the wall loads can redistribute elsewhere anyway...
  7. Tomfh

    Footing capacity after 35 years

    To me, this looks like double dipping. (Assuming the wall is still in service). Your 900 lbs has already caused some settlement - and another 2000 lbs will cause more settlement - more than 2000 lbs would have. Allowable bearing capacities aren’t about ultimate “capacity” — they’re about...
  8. Tomfh

    How to fix this?

    I understand why some want it rebuilt — they want it done as per the drawing, fair enough. But I don’t see why it’s surprising that other engineers might not be as concerned.
  9. Tomfh

    How to fix this?

    It’s not the prettiest, but it doesn’t look like it’s going anywhere. I’m more concerned by the pretty buildings that fall apart.
  10. Tomfh

    Strap bracing for roof purlin

    What’s driving this? Why not normal purlin bracing?
  11. Tomfh

    How to fix this?

    Agree. It knows its own capacity far more accurately than you ever will.
  12. Tomfh

    How to fix this?

    It looks like there might be a gap between the joist and the flooring too? You can end up with that annoying squeaky soft spot.
  13. Tomfh

    How to fix this?

    I agree with kootk. Check that it's good for it, and go from there.
  14. Tomfh

    How are truss joist members stress transfered?

    Yes top and bottom chords bend between nodes, and there is some incidental bending of web members too.
  15. Tomfh

    Zee purlin fixity

    From the lysaght book:

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