The design of the Yurt is highly efficient and maximizes strength while using only a minimum of materials. This is accomplished by using lightweight members under tension and compression.
Diagram from: http://simplydifferently.org/Yurt
Rafters push inward on a compression ring and outward on a tension cable, which acts in a similar way to a hoop on a barrel preventing the rafters from moving/spreading outward."
Roof Loads:
Roof loads are transferred down the rafters to the tension cable
Diagram and captions from: http://www.yurts.com/what/default.aspx

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