I am looking for a reference (starting point) for calculating ring forces in concentric girders supporting thin plates with large deflection. I have a 40m circle with 4 concentric rings (10m, 20m, 30m and 36m)supporting 5mm aluminum plate with uniform pressure applied (1.5kn/m2). Each ring has evenly spaced hangers that provide the vertical support suspending the entire floor. I have found roarke cases that provide reasonable membrane stress values for the plate but I am having difficulties analyzing the stiffeners for the lateral loads induced by the plate? The stiffeners are welded to the top of the plate. I have assumed the outer stiffener resists all lateral loadings and the inner stiffeners are designed for vertical load only. We will use FEA models to evaluate results. I would like to develop a spreadsheet to use in addition to the FEA model. Thank you for any assistance.
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