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约束混凝土本构模型的下降段影响着钢管混凝土的力学性能预测,结合6组方钢管混凝土短柱轴压破坏试验结果,提出一种软化特征可控的双参指数型约束混凝土本构。双参指数型本构考虑了方钢管宽厚比、混凝土强度、钢管截面含钢率等因素的影响,能够很好地模拟在不同约束条件下混凝土的软化行为。基于双参指数型本构,对6组方钢管混凝土试验结果进行了轴压破坏的受力全过程模拟,计算结果和试验结果吻合良好。
The descending section of constitutive model of confined concrete affects the prediction of mechanical properties of CFST. Combined with the experimental results of axial compression failure of 6 concrete-filled square steel tube columns, a double-parameter exponential constrained concrete with controllable softening characteristics is proposed. The double-parameter exponential constitutive model takes into account the influence of factors such as the aspect ratio of square steel pipe, the strength of concrete and the steel content in the section of steel pipe, and can well simulate the softening behavior of concrete under different constraints. Based on the double-parameter exponential constitutive model, the whole process simulation of axial compression failure of 6 groups of square concrete filled steel tubes is carried out. The calculated results are in good agreement with the experimental results.