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Recent content by human909

  1. human909

    Beam Reinforcement Calculation

    This "diatribe" is relevant as it goes to the core of the original question. The longitudinal shear flow between the plates and the I beam would be zero. All you need to do to have them act as a compositive section is to sister them together. So bolts or spot welds at the centroid would be...
  2. human909

    Beam Reinforcement Calculation

    I agree that there is no difference in shear flow at all those points. Whether it is a solid piece or a piece with 3 plates. But then you jump to a false conclusion that you "require welds for side plates". When in fact you don't require any connection beyond a connection to transfer the cross...
  3. human909

    Beam Reinforcement Calculation

    Why are people trying to redefine basic geometric definitions like the first moment of area? (Q) Should we start redefining the second moment of area too? (I) These are mathematical geometric definitions.
  4. human909

    Beam Reinforcement Calculation

    There really shouldn't be any debate. Try calculating the strain between the plate and the I-beam web. Compare the two. See what results you get. If the strain is equal then how is force transferred? The side plates and I beam aren't act compositely. That is the case whether you weld the...
  5. human909

    Fire-Resistance Rating of Floor Assemblies in Industrial Buildings

    I would have thought that you could have a 'performance solution' or similar that could be suitable. I don't know your fire codes but that is how we normally do it for industrial structures including mills etc. Eg ensure suitable egress or other approaches. Fire compartmentalization between...
  6. human909

    Beam Reinforcement Calculation

    No, I've been waiting for him to show up. Maybe he is busy, or bored with the topic. He did provide input in the previous thread linked largely along similar lines of argument as what I have put forward.
  7. human909

    Cantilever Plate bending with UDL

    I find it remarkable so many people in this thread have spent the significant time discussing a 45degree shear lag when we have a UDL line load. I've been very confused by most of this.
  8. human909

    AS 2870 vs NCC

    This general discussion is a really interesting discussing. Unfortunately most Australian engineers (myself included) have quite limited idea on how exactly the law applies to them and I doubt that most involved in the whole approval process have a good understanding either. It likely isn't...
  9. human909

    Wind Load

    Thanks for providing closure. If I may I want to ask a question: I'm curious what percentage was your final wind load? Eg; vs your initial approach of half the wind load value "using the area of the top with a wind load using half the wind load value"? (My gut feel here is to not go below...
  10. human909

    Beam Reinforcement Calculation

    Agreed 100%. Sorry, I thought the point being made was fairly clear that calculating the total area C wouldn't be useful. You would need to calculate the Q area separately as you both point out. Calculating them both together gives you the NET shear flow of the top and bottom segments which...
  11. human909

    Cantilever Plate bending with UDL

    Treat the plate as a simple cantilever beam. You have a long line load so it is just a simple cantilever calculation with a point load of a unit length x UDL. for a beam that is a unit length wide.
  12. human909

    Beam Reinforcement Calculation

    Thanks. The one thing I did leave out is referring to NET or TOTAL shear. I would think by now this would be clear, but I've made the mistake many times of thinking things were clear when they are not. If you break up section C from section A below and calculate QV/I=0 then you would be...
  13. human909

    Beam Reinforcement Calculation

    👋 BAretired No need to apologise, now I'll take the blame for continuing the discussion. ;) It is nuanced because the VQ/I is an inherently correct formula from theoretical fundamentals. Though how it understood and applied is more nuanced than people can realise. For example, from a...
  14. human909

    Beam Reinforcement Calculation

    Apology accepted. We are all human, and get frustrated when others don't seem to listen to what we think are well expressed arguments. I count myself here, and no doubt you have been somewhat frustrated.
  15. human909

    Beam Reinforcement Calculation

    BAretired you really should be more professional in your discussion on this topic. I appreciate your engagement but I haven't appreciated your lack of respect or engagement on this topic. The topic is nuanced. As I've repeatedly indicated. And when designing welds or fastenings you don't...
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