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Why is a truss more rigid than a single beam

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A truss distributes the weight across a longer span without the need for interior load bearing walls. It's all due to their shape.

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The triangle shape

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I saw this on The Magic School Bus. The one where they shrunk in Wanda's house. They needed to build a bridge across the toilet. First they built a single tongue-depresser bridge, but one of the kids almost fell in the toilet. Then they added trusses, dispersing the tension across the length of the toilet. The whole class easily crossed the toilet. Now I realize it's a cartoon, but the same principles apply.

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A triangle is extremely resistant to deformation forces. A beam can bend.

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