Abstract
Assuming that the loaded edges of steel plates are clamped, while the unloaded edges are restrained against rotation, the elastic-plastic local buckling model of rectangular CFT columns was proposed. The formula for calculating elastic-plastic local buckling strength of steel plates in rectangular CFT columns were proposed using the deformation theory of plasticity. The calculated results by formula were compared with the experimental results, showing good agreement between the calculated results and the experimental results. Based on the proposed elastic-plastic local buckling model of rectangular CFT columns, the effects of width-to-wall thickness ratios on the elastic-plastic local buckling critical stress of the steel tube in the cases of different cross-sectional aspect ratios were investigated. Finally, the reasonable limitations for width-to-wall thickness ratios and the reasonable thickness ratios of the steel plates in the cases of different cross-sectional aspect ratios are suggested for engineering design, which can ensure that the elastic-plastic local buckling of the steel tube can not occur before the steel yield.
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