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Non-Building seimic analysis

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Does anyone know what "normal operating contents" is as far as dry storage
in a cylindrical hopper. I am dealing with an engineer that considers it to
80% of the material weight that the hopper can hold.
Also, what would Rw be if the hopper is supported on a concentrically braced
frames (WF columns and beams with angle bracing).

Chris Wood PE, SE