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I wish to drive a forklift truck over the plate with a wheel load of 37.5KN max, which will result in a concentrated load over a small area midspan (a1) 250mm x (b1) 50mm.

I wish to check the bending capacity of the plate by hand (as opposed to FEA) and my question is therefore what would be a suitable approach/calculation for this check ??

I have looked at Roarks formulas but struggled to find a suitable support condition for the plate, so have pondered if a simplistic approach would be to determine a section modulus (bd

^{2}/6 for the plate based on a 45 deg dispersion from the concentrated load to the supporting rib, can anybody see a problem with this ?