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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。
It is assumed that the four sides of the CFST column are all fixed constraints and the local buckling model of CFST column under bias voltage is established based on the finite strip method. The local buckling coefficient of CFST column under different stress gradient was calculated by using the established model, and the local buckling strength of the CFST column under bias pressure was obtained. In order to verify the correctness of the model, the calculated values of the local critical buckling coefficient and the calculated value based on the energy variation formula of the square steel tube columns with square concrete columns based on the model are in good agreement. At the same time, the calculated local buckling strength based on the model in this paper is also in good agreement with the previous one. Which further verifies the correctness of the model. Finally, the rationale of the ratio of width-thickness to thickness of CFST column steel under bias is studied, and the reasonable ratio of width to thickness of CFST columns with different stress ratios is given for engineering design and application.