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The reason why forces are transmitted in arches is similar to the joint structure in the other question. Additionally there are the internal bending moments that also change the undeformed shape of the element (be it beam or arch). arches build with stone Although not in your original post, I will focus on the forces in stone arches. In order to understand ...


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The arch works by being deformed and compressed under the vertical loads. When it deforms it wants to settle down and its geometry changes trying to trace a shorter path. But that shorter path means it strains the material creating compression stress in the material of arch, being it pieces of rock or concrete or masonry or even bags of dirt. That is the ...


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Below is the free body diagram of a 3 hinged arch. The forces are passed through the internal stresses. See this article for examples.


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