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  1. Denial

    Slab on grade on High Density Foam

    It you are able to reduce the combined supporting effect of your foam and your subgrade material to an approximately equivalent Winkler type of foundation you might get some useful results from a pair of spreadsheets I have developed to analyse slabs on an elastic foundation. One for when the...
  2. Denial

    Interesting ponding/deflection problem

    The phenomenon of ponding can also be viewed as a "kind of" beam-on-elastic-foundation phenomenon, where the foundation's "Winkler" stiffness is negative rather than positive and has a spring value equal to (minus) the density of the ponding liquid. Note however that Hetényi's equations are not...
  3. Denial

    Interesting ponding/deflection problem

    As an aside, can you give a reference to the "previous thread about water ponding on slabs"? I missed it.
  4. Denial

    Interesting ponding/deflection problem

    I believe the theoretical answer is B, regardless of the magnitude of the initial (pre-liquid) deflection. Of course you will never get this answer through conventional linear elastic analysis. You would need to allow for the non-linear behaviour associated with large displacement theory. The...
  5. Denial

    Correct way to define a cable sag

    I have no idea how various Codes of Practice express themselves. However I have read a lot of academic and semi-academic papers on the subject of cables, and they pretty much universally define sag as the VERTICAL distance from the MIDPOINT of the straight line between the cable's end points to...
  6. Denial

    1/2 loading for 1/2 model in ansys?

    If EVERYTHING is fully axisymmetric, as looks to be the case, why not simplify further and model only a 90° slice? Or, if your FE software allows it, you could follow IdanPV's suggestion and reduce it to a sort-of two dimensional axisymmetric problem. (But note ThomasH's warning about any...
  7. Denial

    Wild differences in manual and FEM calculation results (floor on grade)

    Glad you have sorted things out. You were using the spreadsheet I was referring to, but you were a long way from defining what I believe to have been your problem. If you want to feed a corrected version of your problem into the spreadsheet and you then have any queries, it would be better to...
  8. Denial

    Wild differences in manual and FEM calculation results (floor on grade)

    Nivoo. You might get some useful results from a couple of spreadsheets I developed quite some time ago. They calculate the peak deflection and/or bending moments in slabs supported on Winkler foundations, under the action of arbitrarily shaped pressure loads. One spreadsheet handles the case...
  9. Denial

    Unspillable bottle

    If "the liquid" is at all sticky you will have a lot of trouble cleaning a convoluted flow path.
  10. Denial

    Left vs right thread

    Thanks for the correction, Prometheus. It was more than fifty years ago, and I have never touched an oxy-torch since then. A good thing I haven't, since I remembered it totally wrongly.
  11. Denial

    Left vs right thread

    Regarding dtimberlake's comment #14 above, the use of LH and RH threads in gas fittings is for an entirely different purpose. When I was learning oxy-acetylene welding, it was explained to me that (after both gas cylinders had been attached to the welding torch) you turned on the oxygen first...
  12. Denial

    Left vs right thread

    I can only talk for bicycle threads. These differ between sides so that if there is any friction between the rotating part of the pedal and the fixed part (the part you screw into the crank arm), then on BOTH sides that friction will tend to drive the pedal further INTO the shank rather than...
  13. Denial

    Power Needed to Rotate a Mass to a Speed in a Specified Time

    Your questions are fairly basic. I will reply with a suggestion rather than an answer. Rather than thinking about a problem involving rotational motion, think about a mathematically identical problem involving linear motion. Linear speed instead of rotational speed. Mass instead of...
  14. Denial

    Loads/Units shown on drawings

    Unfortunately a lot of "writing contexts" do not support the   "feature", and do not provide equivalent functionality by other means. Similar problems arise if you like to use non-breaking hyphens.
  15. Denial

    Design of Simple Lift beam with a trolley

    I don't know what the various codes might say, but surely anything that moves is POTENTIALLY dynamic.
  16. Denial

    Why the symmetrical structure under self weight has unsymmetrical deformation?

    I have never been a SAP user, so I cannot offer any specific comments. But if you genuinely have a symmetrical model and you genuinely apply a symmetrical load to it, then all aspects of the analysis results should exhibit the same symmetry. If your results do not show symmetry then your...
  17. Denial

    InserVariable is not recognised

    ' ' This is all way above my pay grade, but an unmatched single quote usually introduces ' some comment text, even if it occurs after some earlier executable code in the line. '
  18. Denial

    Why Do Some People Believe They Have the Right to Dominate and Suppress Others ?

    My apologies, Jon. I have not been monitoring things adequately over the last few weeks. Yes! I have had posting rights to that group pretty much since I lodged my request. Thanks for your rapid actioning.
  19. Denial

    FAQs are kind of gone

    Agreed, LP. Even more ideally, Excel's chart-defining mechanism would include a switch allowing a spreadsheet's author to enforce equal scales. (I use Excel-2010 — maybe later versions do have such a feature.)
  20. Denial

    Why Do Some People Believe They Have the Right to Dominate and Suppress Others ?

    Thanks, IR. That page did have a Join Group button, which morphed into a Leave Group button after I clicked upon it. I do not yet actually have write-access to the site of course. This hopefully follows once the box is examined for any black balls. https://en.wikipedia.org/wiki/Blackballing

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