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Recent content by ChorasDen

  1. ChorasDen

    How to install tie rods to counter roof thrust in a barn with a central post obstruction?

    What's the roof pitch? I could see some outward thrust based on the low pitch the photos appear to indicate. Assuming all the OP's assumptions are correct, I haven't looked through the post yet, but to address the question, why are you unable to place a tie rod concentrically through the post...
  2. ChorasDen

    Calculating moment for a beam with a tapered load on part of the span

    It's trivial to do by methods of cuts. Simply take a cut in the member where you wish to know the moment, and calculate the moments around that location. You can do the same thing to derive M = WL^2/8 when x=L/2 for a uniformly loaded member if you desire.
  3. ChorasDen

    Calculating moment for a beam with a tapered load on part of the span

    you still need to compute the reactions based on my equations, but that should be trivial for any typical design case. I'll summarize here for readability: 1) For x >= (A+B) Mc = RD*l - (WB(l-x))/2 2) For x<=A Mc = l*RE-(WB(l-x))/2 3) For A < x < (A+B) Mc = RD*l-(l-x)(w(l-A)/2) refer to the...
  4. ChorasDen

    Calculating moment for a beam with a tapered load on part of the span

    Here is what I came up with in 5 minutes, after having to retrain myself on the method. I give no guarantees of the formulas though, but from a quick glance they seem appropriate.
  5. ChorasDen

    Calculating moment for a beam with a tapered load on part of the span

    Have you tried figuring it out by using methods of cuts or virtual work?
  6. ChorasDen

    timber pole bridge analysis

    Load sharing is dependent on the stiffness ratio of the member transferring the load (decking) compared to the member carrying the load (pole). If they have similar stiffnesses, you can probably make an assumption that the decking can spread load over a certain area, I'd typically consider what...
  7. ChorasDen

    timber pole bridge analysis

    To address the load sharing concept, without doing some calcs and understand what load is to be applied, I cannot easily answer. Let's work backwards, how do you propose the load sharing to occur, how would you justify it and/or confirm it, and how might deficiencies arise? Considering the scope...
  8. ChorasDen

    timber pole bridge analysis

    How will the poles be graded, i.e. how will you establish properties? I think you may get into a situation depending on span and loading where lateral torsional is a concern, although the weak-axis stiffness is going to be quite large for a pole such as this. I would not go with the approach of...
  9. ChorasDen

    Is mill steel sections isotropic or anisotropic?

    Can you expand on the idea that it is anisotropic? How would it be so, and in regards to what design properties? I do zero steel design, so I am far from an expert, but tagging in here to see if anyone else has more commentary.
  10. ChorasDen

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

    When I was working in it about 5 years ago or so, it was because OpenGL was open source and licensing was free (maybe only for non-commercial? I cannot recall), rather than something like DirectX, or the alternate Vulcan, which I was unfamiliar with. I was doing some work visualizing large scale...
  11. ChorasDen

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

    I don't write in C++ as much as I used to back in college, but I still do it from time to time if I am feeling there is a particularly good reason to do so. Working in OpenGL was the last significant work I did in C++, is OpenGL even still around anymore? Seems I could be dating myself. To...
  12. ChorasDen

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

    For various reasons, I have, and likely always will, hate using Excel. So I default to using a compiled language rather than trying to decipher what various cell references are trying to indicate in any one of the archaic spreadsheets that are out there. I also do not have a personal excel...
  13. ChorasDen

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

    My default is to use typical widely available design software, they are typically FEA due to the the software authors choices, but for the work I do, they do not strictly need to be FEA. For non-typical situations where I will do the calc 5 or more times over the next few years, I will prep an...
  14. ChorasDen

    41 Years old looking to go back to school to receive MS. Looking for advice!

    This is a tough one, on one hand I get it, you went to school for engineering, you want to go back and do engineering. Forgetting the cost, time, and family effects for a minute, what has lead you to this? Are you unhappy in your current position, or are you more just thinking 'what if?'. If...
  15. ChorasDen

    Structure behaves as an arch or flexural member?

    Which load path is stiffer, the unreinforced arching concrete, or the encased steel beam? I don't think there is a direct answer, as the stiffness of the steel is dependent on the arch taking some load and preventing the encased steel from deflecting. But this might help you to think about how...
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