Which is better for structural support PVC pipe or plywood?

So the support structure is the "T" in your sketch? And the load is the brown hanging part?
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?
 

berkeman

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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?
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?
 
You mean something like this?
 

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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
 

berkeman

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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
Bending which way? Can you upload a 3-D perspective drawing of what you are wanting to do?
 
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
 
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Nidum

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Best support for that kind of structure is a pair of shaped plywood cuttings with spacers between .
 
Shaped how?
 
oh so an anvil shape but would it hold out with 3m on either side and all the weight?
 

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 .
 
Ok hmm I suppose I could try making support for the ends that could be placed after the wings
 

Nidum

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Can you fix the construction to a wall ?
 
No, I was planning on it to be mobile
 
KISS IS THE EQUATION- you can build a bow -archery type- out of pvc -good luck with plywood.
 
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What I'm making is a long wing like structure for display, it will be about 10ft (3m) long and I'd like it to last a long time.
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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