钢管混凝土短柱轴压破坏三维有限元分析

Researching the effect on concrete on whether considering the interaction between steel tube and Concrete, it uses different generous ratio of the steel tubes, and uses not considered plain concrete interacted with steel tubes and considered concrete interacted with steel tubes as the study of parameters, and establishes the non-integrated model of concrete-filled steel tube. Under using the method of three-dimension finite element analysis, comparing with the experimental results. It shows that for the non-integrated model of concrete-filled steel tube, and the research results and initial stiffness of considering interaction between steel tubes and concrete are basically identical. However, initial stiffness is smaller than the research results when not considering interaction between steel tubes. The maximum axial force value of concrete-filled steel tube's finite element analysis and experimental value are basically identical when considering the interaction between steel tubes and concrete. However, the maximum axial force value of concrete-filled steel tube's finite element analysis is smaller than experimental value when not considering the interaction between steel tubes and concrete. As the thickness of steel tube becoming larger, the steel tubes' generous ratio becomes smaller, and interaction increases more obviously. When the generous ratio is less then 25.0, for concrete, if considering the interaction of damaged forms, the design of triaxial expansion damage will be recommended.