People above have brought up safety factors, LRFD loading factors, allowable stress versus ultimate loading etc. Is grating width and span the same thing?īecause grating is a 1-way element, I would assume a tributary width of 1ft and then your span is whatever distance between supports is. I'm not following your calculations 100%. RE: Working Platform design made of grating are he deflections and stresses in other direction too small?Īt this point, I am not worried about the beams supporting the grating Third question: Most of the grating load tables are unidirectional while in reality the load is acting over an area. Then I will create an equationīending moment due to concentrated (span L) + bending moment due to UDL (span L) = Total bending moment I can calculate the allowable bending moment. One idea comes to mind is: I have the allowable fibre stress and section modulus per foot of width. Second question: If I have to consider both at the same time Another check should be carried out to see at UDL of (225/64) lb/in^2 with a factor of safety 5.įirst question: Am I doing it right or should I consider both scenario at the same time? It should be able to withstand a concentrated load of 450 separately I was going over the code and found the following design criteria.Ī working platform shall be able to support in any position at least 450lbf, with a load concentration of atleast 225lbf over an area of 64in^2 with a factor of safety not less than 5. Intent is to design a working platform from bar grating. I am designing a working platform for a maintenance technician for servicing the machine.
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