The large deflection of a thin rectangular steel plate under laterally distributed pressure over a certain length of the plate span is investigated. Assuming “zero aspect ratio”, plate ends are clamped and the other two edges are free. The plate behavior is analyzed considering membrane effect only, which is the dominant action in the large deflections of thin plates. The plastic strain criterion is used to predict the fracture point in the plate. Finite Element Analysis (FEA) is used to predict the fracture with the same criterion and the results compare well with theoretical formula.

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