中文摘要：

普通铜管混凝土短柱核心混凝土的本构关系不能满足自应力钢管混凝土轴压短柱的计算需要．在已有试验的基础上，补做了12根自应力钢管混凝土短柱轴压试验．首先测量了自应力钢管混凝土短柱在限制条件下的膨胀性能；然后对其进行了轴压承载力试验．通过对37根自应力钢管混凝土短柱轴压试验结果进行分解分析，提出一种适用于自应力钢管混凝土短柱轴压计算的等效单轴本构模型，与传统的混凝土本构关系相比，这个本构关系考虑了自应力水平和套箍系数对核心混凝土的影响，并且具有计算简单、方便的特点．

英文摘要：

The existing constitutive relations for the concrete core of common concrete-filled steel tube short columns can not meet the need of calculation of self-stressing concrete-filled steel tube axial-compressive short columns. 12 self-stressing concrete-filled steel tube short columns are tested. Firstly, the confined expansion deformation is measured. The mechanical performances of these specimens are tested later. Based on the experiments of 37 short columns, an empirical equivalent uni-axial constitutive relation for calculating carry capacity of self-stressing concrete-filled steel tube short columns under axial load is proposed. Compared with the traditional relations for concrete, this constitutive relation takes influences of self-stressing and confinement index on core concrete into account, and it is simple and convenient for calculation.