Abstract
There are few studies on the ultimate strength of steel plates under in-plane combined loading, and their basic strength curves in the design specifications in many countries are still based on the elastic buckling theory using relevant safety factors. Evaluation in the ultimate strength is essential to promote the ultimate limit-state design method. This paper presents the ultimate strength of plate panel under in-plane stress gradient. Based on the analytical results, the ultimate strength formulas for uniform compress and pure bending are proposed, respectively and the interaction formula for the combined loading of compression and bending are then proposed.
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