5/2/ · This plate (1) part that represents a flat structure (1) In some ntexts, for example in analysis, the term plate object may be used to refer to plates. (2) plate that represents a steel structure (2) Plate is mainly used as a nnection piece or as a floor plate. can be full depth or user-defined. Dialog fields are available to ntrol: the shape, name, finish & class of the plate, the size of the notch, top and bottom clip rner options, and up to 3 welds.