中文摘要：

假定方钢管混凝土偏压柱钢板四边均为固定约束,建立基于有限条法的偏压下方钢管混凝土柱钢板局部屈曲模型。利用所建立模型计算了不同应力梯度下方钢管混凝土偏压柱钢板局部临界屈曲系数,从而得到偏压下方钢管混凝土柱的局部屈曲强度。为了验证模型正确性,对基于所述模型的方钢管混凝土偏压柱钢板局部临界屈曲系数计算值与基于能量变分法公式的计算值进行比较,两者非常吻合。同时,基于本文模型的局部屈曲强度计算值与先前试验结果比较,亦整体吻合良好。从而进一步验证了所述模型的正确性。最后,研究了偏压下方钢管混凝土柱钢板合理的宽厚比限值,给出了不同应力比时方钢管混凝土柱钢板合理的宽厚比限值,以便于工程设计应用。

英文摘要：

A local buckling model based on finite strip method for the steel plate in eccentrically loaded square CFT columns was set up by assuming that the four edges of the steel plate in eccentrically loaded square CFT columns are clamped.The critical local buckling coefficients of the steel plates in eccentrically loaded square CFT columns under various stress gradient coefficients were calculated by using the proposed model,which resulted in the local buckling strength of the steel plate in eccentrically loaded square CFT columns.In order to validate the correctness of the model,the calculated values of critical local buckling coefficients of the steel plates in eccentrically loaded square CFT columns by the proposed model were also compared with those calculated by the equation based on the energy method,showing a very good agreement.In addition,the calculated values of the local buckling strength by the proposed model were also compared with test results,resulting in a good agreement in general.Then,the correctness of the proposed model was further verified.Finally,the reasonable limitations for width-to-wall thickness ratios of steel plates in eccentrically-loaded square CFT columns were studied,which resulted in the reasonable limitations for width-to-wall thickness ratios of steel plates in eccentrically-loaded square CFT columns for the application of engineering design.