Analysis Of Hysteretic Capability Of Concrete Filled Steel Tube Compression-bending Members

Concrete Filled Steel Tube (CFST) is maked up by the special way.Because it has a series of superior mechanics performance, has got more and more extensive application at domestic and abroad. With CFST increasing in actual projects, it is necessary to make further study to dynamical behaviors of CFST.In this paper, the research current situation at domestic and abroad and existing main research theory of CFST component is introduced, and M-φ hysteretic capability of CFST compression-bending member is researched.At first, the stress-strain models of the steel and concrete under dynamic actions have confirmed on the basis of dynamical behaviors experiments and the oretical analysis for CFST compression-bending member.On this basis, it is simulated that M -φ hysteretic curve of CFST compression-bending member by finite element software ANSYS. According to monotonic M-φ relations for CFST compression-bending member, the parameters such as steel rate, axial compression ratio, slenderness ratio, concrete strength and steel strength, which affect M-φ hysteretic curves, are analyzed. M-φ hysteretic model is given on the basis of integral calculation and parameter analyze for CFST compression-bending member.The comparisons of experiments results from M-φ hysteretic modelc urves show that hysteretic modela nd d ata are agree well. This proved the hysteretic model is suitable to dynamical behaviors calculation of CFST compression-bending member.The hysteretic model can be refered for research of CFST dynamical performance .