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Recent content by Tomfh

  1. Tomfh

    Air India 787 crashes on take off

    I haven't been following this for a while. Was the earlier talk of supposed electrical problems a red herring? Is that normal that the RAT would deploy in the event of dual engine failure during takeoff?
  2. Tomfh

    Amusement park ride collapse in Saudi Arabia

    Yes. it shows you that the machine works, but not much about the failure that occurred. I meant the kind of “test” in the video, which appears to be just running it to see it works.
  3. Tomfh

    Structure behaves as an arch or flexural member?

    Without confirmation that the backfill can resist the thrust without budging, I’d assume flexure.
  4. Tomfh

    For fun, how would you analyze this joist?

    I’d hang half a tonne from it and see what happens.
  5. Tomfh

    Conversation starter: How heavily do you rely on computational tools?

    Mainly stick model finite elementc, both 2D and 3D, and hand calcs. Rapt for one way slabs and Plate finite element for two way concrete. Excel for code formulas, and summing loads.
  6. Tomfh

    Amusement park ride collapse in Saudi Arabia

    Imagine the fatigue forces on something like that. Hundreds of thousands of full stress reversals. Not sure what a factory test would tell you.
  7. Tomfh

    Forum Clutter - Students (and others) posting in this forum

    Good summary.
  8. Tomfh

    Forum Clutter - Students (and others) posting in this forum

    Yep. Very few people actually understand the physics of it, I certainly don’t. You just ride. As a kid, I read in a physics book that the wheels act like gyroscopes and that’s what keeps the bike stable. I believed it. I didn’t realise that was basically rubbish until I was about 30 😂
  9. Tomfh

    Design of HSS - Include moment from connection offset

    I did a test too on similar SHS and was surprised how bad it can be. From "it works easy" to "it's dead under service load"
  10. Tomfh

    Residential Slab Foundation

    Yes on some projects. It can be a pain.
  11. Tomfh

    Design of HSS - Include moment from connection offset

    Have you ever seen it actually go bad, like a column buckling because of it? I know the code says to do it, and I follow it, but I’ve never been quite sure how critical it really is, given there are a lot of engineers who say they're never done it. Probably the best way. Do you ever use the...
  12. Tomfh

    Design of HSS - Include moment from connection offset

    This is an interesting topic. I've seen many engineers just design for the axial load and assume the connection and other stiffnesses get the load into the middle of the column. I check for the eccentricity - the edge of the column, or the bolts, depending on the circumstance. How do you guys...
  13. Tomfh

    Residential Slab Foundation

    These thermal details are becoming a real pain here in Australia, where the climate is pretty mild. Suddenly there’s this pedantic obsession with thermal bridging, every architect and “green” consultant acting like a simple facade bracket is some catastrophic design flaw. “Oooh no, can’t have...
  14. Tomfh

    Stepping Down a Foundation

    Yes similar to that.
  15. Tomfh

    Stepping Down a Foundation

    Yeah, it’s similar to that. We often just run the downturn through and sit the slab on the walls, so the whole platform ends up level once the retaining walls are built. I don't really trust building on cut/fill. I've seen too many now where the fill consolidated over decades and the cut zone...
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