What length do I need for the reinforcement axle?

Re: beamless plate Since the thickness of the beamless plate is L/30, if I take the length between 40*40 columns from the hanger or from the column end, there is a length difference of 40 cm. which means a thickness of 1.33 cm. We want to make a 20 cm thick plate without beams because we have a height problem. I placed columns at 6m intervals. now when this range is taken from axis to axis, it is 640 cm and I get a warning that the thickness does not save. Here, the regulation tells us what length we should get, I couldn't figure it out.
 
Re: plate without beam Since there are no beams, take this distance from axle to axle. If you are making headings in columns, you can get h=>l/35. I don't know what kind of load it will have on it, but 20 cm is already a minimum thickness and make sure to check for stapling in columns. Remember, stapling is a type of brittle breakage and it happens suddenly, without action. Also, if you are building a high building, consider whether the earthquake forces will be transferred by 20 cm of flooring, and therefore, whether this thickness is sufficient for horizontal forces. Check both options under semi-rigid diaphragm in ideCAD analysis settings.
 
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