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