The newest version of RAM SS 15.05 now has unique stiffness modification factors for each deck direction for materials such as corrugated roof deck. However, I haven't found diagram, or example explaining what the factors "f11", "f22", "f12", "m11", "m22", and "m12" are actually referencing. I'm guessing these are possibly the in-plane and out-of-plane stiffness of the diaphragm? Will there be a tutorial soon on the best way to determine these for products such as Vulcraft b-deck for example?
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