I think what you are thinking about is a truss structure like a railroad bridge.
A triangle has the property that it is not possible to change the length of a side without changing at least one of the angles, and it is not possible to change any of the angles without changing the length of one of the sides. Thus triangles have a great advantage in rigidity.
That is the advantage of a triangle: rigidity. Not strength, but rigidity, which is a different property. A truss is rigid for its size and weight because triangles resist changes in shape.
In building a bridge, for example. or a roof truss in a building, a series of interlocking triangles supports itself and each reinforces the rigidity of another. You will see this principle at work in almost any area of structural design. You will find diagonal braces on anything from a screen door to a cargo ship. The same principle applies.
For much more information, including pictures and diagrams, try an internet search on "truss structure."
Source:
I think what you are thinking about is a truss structure like a railroad bridge.
A triangle has the property that it is not possible to change the length of a side without changing at least one of the angles, and it is not possible to change any of the angles without changing the length of one of the sides. Thus triangles have a great advantage in rigidity.
That is the advantage of a triangle: rigidity. Not strength, but rigidity, which is a different property. A truss is rigid for its size and weight because triangles resist changes in shape.
In building a bridge, for example. or a roof truss in a building, a series of interlocking triangles supports itself and each reinforces the rigidity of another. You will see this principle at work in almost any area of structural design. You will find diagonal braces on anything from a screen door to a cargo ship. The same principle applies.
For much more information, including pictures and diagrams, try an internet search on "truss structure."
Source:
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