中文摘要：

通过无水泥方钢管粉煤灰混凝土的轴压短柱试验，得到核心无水泥粉煤灰混凝土的应力应变关系曲线和解析表达式，并应用统计分析软件SPSS19．0进行特征值的回归分析，得到了无水泥方钢管粉煤灰混凝土中核心无水泥粉煤灰混凝土的本构关系。

英文摘要：

By the experiments of cement-free fly-ash concrete filled square steel tubular stub columns under axial compression,the stress-strain relationship curve of core cement-free fly-ash concrete was obtained.The analytic expression of the stress-strain relationship curve was also established.Through the regression analysis of eigenvalues using statistical analysis software SPSS 19.0, the constitutive re-lation of core cement-free fly-ash concrete of concrete-filled square steel tube was set up.