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Which is better for structural support PVC pipe or plywood?

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  1. Jan 16, 2017 #26
    That is correct or that's how I thought it should be made. Do you have an idea for a better way to do it?
     
  2. Jan 16, 2017 #27

    berkeman

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    Triangles are usually better than "T"s. What kind of bracing can you add at the right angle joins? Evem better.can you design it as a triangle support or a rectangular support?
     
  3. Jan 16, 2017 #28
    You mean something like this?
     

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  4. Jan 17, 2017 #29
    Oh wait OK let me totally rephrase this. Under a bending stress which can sustain more stress an equilateral triangle, a square, or a circle assuming the height of the triangle, side length of the square and the diameter of the circle are all the same value. I think this is what I should have been asking from the beginning
     
  5. Jan 17, 2017 #30

    berkeman

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    Bending which way? Can you upload a 3-D perspective drawing of what you are wanting to do?
     
  6. Jan 17, 2017 #31
    Just a weight placed right in the middle like if there's a tube, a box beam and a hollow triangular structure each a meter long with the same wall thickness, held at either end and each with a force pressing down on the center. Which could withstand the most force?

    Edit: And so sorry, I can't upload a 3D image
     
    Last edited: Jan 17, 2017
  7. Jan 18, 2017 #32

    Nidum

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    Best support for that kind of structure is a pair of shaped plywood cuttings with spacers between .
     
  8. Jan 18, 2017 #33
    Shaped how?
     
  9. Jan 18, 2017 #34
    oh so an anvil shape but would it hold out with 3m on either side and all the weight?
     
  10. Jan 18, 2017 #35

    Nidum

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    I see that you have added some new dimensional information to one of your posts since I first read it .

    To have cantilevered platforms as long as 3 metres on a narrow central support pillar is not a realistic proposition .

    Possibilities :

    Use three or more support pillars with metal bracing at intermediate and end locations .

    Use multiple trestle leg supports under the whole lengths of the platforms - probably much easier for you anyway .
     
  11. Jan 18, 2017 #36
    Ok hmm I suppose I could try making support for the ends that could be placed after the wings
     
  12. Jan 18, 2017 #37

    Nidum

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    Can you fix the construction to a wall ?
     
  13. Jan 18, 2017 #38
    No, I was planning on it to be mobile
     
  14. May 24, 2017 #39
    KISS IS THE EQUATION- you can build a bow -archery type- out of pvc -good luck with plywood.
     
  15. May 24, 2017 #40
    I'd be very reluctant to build anything from PVC if I wanted it to last a long time. PVC is a plastic type material and deforms plastically with the passage of time. Plywood has some of the same problems, but to a much lesser degree in most situations.
     
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