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基于3个现有试验结果,对钢管混凝土界面的粘结强度、粘结及非粘结摩擦系数、摩擦系数的误差水平、正常断裂能释放率、不同正应力下的粘结及非粘结滑动断裂能释放率、破坏包络线的形状参数等材料属性进行研究。基于3参数双曲破坏准则,提出了钢管混凝土界面的一种典型本构关系,反映了粘结情况对界面性能的巨大影响。对该本构关系中各界面参数进行分析。通过试验数据分析、破坏包络线几何分析及敏感性分析,确定各界面参数值。在3种界面长度下,将这些参数应用于钢管混凝土方柱的推出试验中。通过对比试验数据和数值结果,分析钢管混凝土方柱的破坏过程。
Based on the results of three existing tests, the bond strength, bond and non-bond coefficient of friction, the error level of friction coefficient, normal fracture energy release rate, bond and non-bond slip under different normal stresses Fracture energy release rate, the shape of the destruction of the envelope parameters such as material properties were studied. Based on the 3-parameter hyperbolic failure criterion, a typical constitutive relation of concrete-filled steel tube (CFST) interface is proposed, which shows the great influence of the bonding condition on the interfacial properties. The parameters of each interface in this constitutive relation are analyzed. Through the analysis of experimental data, the geometrical analysis of the envelope and the sensitivity analysis are destroyed, and the parameters of each interface are determined. Under the three interface lengths, these parameters are applied to the launch test of square concrete filled steel tubular columns. By comparing the experimental data and numerical results, the failure process of CFST column is analyzed.