in order to expedite the advancement of plastic analysis of plates, the problem of buckling is categorized into various classes and relevant methods of analysis are proposed. this is done by observing magnitudes of strains measured in recent tests on box girders and stiffened plates. three classes of problems are recognized: yielding failure, elasto-plastic buckling and plastic collapse. the first can be analysed by elastic theory using a fibre-yield criterion as a check. for elasto-plastic buckling, since the criteria based on fully plastic section are found to err on the unsafe side, an improved yet simpler criterion (termed the lower yield criterion) is proposed. for the study of plastic collapse, simple formulae based on large strains are derived. this report is mainly concerned with the theory and application of the lower yield criterion. an axample of a plate in compression is given to demonstrate the predicted extent of plasticity at collapse. (a)

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